NDBE Part1 Questions - Please help with answers and explanations

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1. Which of the following BEST describes the direction of synthesis for DNA, RNA and protein ?

DNA RNA Protein

a. 5' -> 3' 3' -> 5' C-terminal -> N-terminal
b. 5' -> 3', 3' ->5' 3' -> 5' N-terminal -> C-terminal
c. 5' -> 3' 5' -> 3' N-terminal -> C-terminal
d. 3' -> 5' 3' -> 5' N-terminal -> C-terminal
e. 5' -> 3', 3' ->5' 3' -> 5' C-terminal -> N-terminal

2. For which is the first group of the following pairs more likely to be located on the surface of a globular protein than the second group of the pair ?

a. -CONH2 -COO
b. -CH3 -CH(CH3)2
c. -CH20H -NH4
d. -CH3 -CH2OH
e. -CH2SH -COO

3. Which of the following describes the regulation of smooth muscle contraction ?

a. It requires troporun
b. It requires calmodulin
c. It does not require calcium
d. It does not requre myosin kinase
e. It does not require cross-bridge formation

4. A 0.2 mole/liter NaCl solution and a 0.2 mole/liter glucose solution are separated by a membrane that is impermeable to these solutes but is permeable to water. Which of the following statements is correct ?

a. There will be no net movement of water to either solution.
b. Water will go from the glucose to the saline solution
c. Water will go from the saline to the glucose solution
d. Concentration of glucose will decrease
e. Concentration of NaCl will increase

5. Stimulation of sympathetic adrenergic nerves to the blood vessels of an organ causes vasoconstriction because

a. alpha receptors are activated
b. beta receptors are activated
c. nicotinic receptors are activated
d. alpha receptors are inhibited
e. beta receptors are inhibited

6. What is the net change on glutamic acid at a pH of 1 ?

a. +2
b. +1
c. 0
d. -1
e. -2

7. Complementary DNA (cDNA) libraries include

a. all the DNA in the genome
b. only genes with palindromic sequences
c. only the genes that are transcribed into mRNA
d. single-stranded DNA synthesized by reverse transcription

8. A single impulse travels down an alpha motor axon. This results in which of the following ?

a. The activation of a single motor unit
b. The contraction of one muscle fiber
c. A subthreshold generator potential
d. A muscle action potential without contraction
e. Brief repetitive firing of muscle fibers

9. Which of the following portions of the elctrocardiogram corresponds to ventricular repolarization ?

a. P wave
b. T wave
c. PR interval
d. ST interval
e. QRS complex

10. Which of the following EKG intervals represents the propagation time of the cardiac impulse between the SA and AV nodes ?

a. QT
b. QR
c. ST
d. PR
e. QRS


11. Two pulp canals are usually found in which of the following ?

Tooth Root
a. Maxillary first premolar Lingual
b. Mandibular first molar Distal
c. Mandibular second molar Mesial

12. A deep lingual fossa and prominent marginal ridges are MOST characteristic of which of the following anterior teeth ?

a. Maxillary central incisor
b. Maxillary lateral incisor
c. Mandibular lateral incisor
d. Maxillary canine
e. Mandibular canine

13. Which of the following morphologic variations would worsen the prognosis for existing periodontal disease ?

a. Fused roots
b. Excessively long roots
c. Amelogenesis imperfecta
d. Shoveling trait in central incisors

14. Which of the following restorations is the LEAST likely to interfere with a patient's physiologic maximum intercuspal position contacts ?

a. Distolingual Class III on a maxillary right canine
b. MO on a mandibular right first premolar
c. MOD on a maxillary right second premolar
d. MO on a maxillary left first molar

15. Each of the following structures is normally exhibited by mandibular incisors EXCEPT one. Which one is this exception ?

a. Cingula
b. Mamelons
c. Lingual Fossae
d. Marginal ridges
e. Imbrication lines

16. When the mandible makes a right lateral excursion from an ideal intercuspal relation, the mesolingual cusp of the maxillary right first molar passes through which of the following mandibular structures ?

a. Embrasure between first and second molars
b. Embrasure between the first molar and second premolar
c. Lingual groove of the first molar
d. Distofacial groove of the first molar

17. When an adult with a normal occlusion moves the mandible from right lateral relation to maximum intercuspation, which cusp moves between the facial cusps of the maxillary right second molar ?

a. Distofacial of the mandibular first molar
b. Distal of the mandibular first molar
c. Mesofacial of the mandibular second molar
d. Distofacial of the mandibular second molar
e. Mesofacial of the mandibular third molar

18. Which of the following features is common to both mandibular first and second premolars ?

a. Triangular (in outline) occlusal table
b. Horizontal distal marginal ridge
c. Bilaterally symmetrical crown
d. Dissimailar marginal ridges
e. No transverse ridge

19. The contact area that is MOST nearly circular is located on the crown of which of the following maxillary premolars ?

a. Mesial of the first
b. Distal of the first
c. Mesial of the second
d. Distal of the second

20. Each of the following root surfaces on a mandibular first molar normally exhibits a longitudinal groove EXCEPT one. Which one is this EXCEPTION ?

Surface Root

a. Mesial Mesial
b. Distal Mesial
c. Mesial Distal
d. Distal Distal

21. Which of the following represents the MOST powerful muscle of mastication ?

a. Masseter
b. Temporalis
c. Geniohyoid
d. Lateral pterygoid
e. Sternocleidomastoid

[QUOTE=fluoride]1. Which of the following BEST describes the direction of synthesis for DNA, RNA and protein ?

DNA RNA Protein

a. 5' -> 3' 3' -> 5' C-terminal -> N-terminal
b. 5' -> 3', 3' ->5' 3' -> 5' N-terminal -> C-terminal
c. -> 3' 5' 5' -> 3' N-terminal -> C-terminal
d. 3' -> 5' 3' -> 5' N-terminal -> C-terminal
e. 5' -> 3', 3' ->5' 3' -> 5' C-terminal -> N-terminal


7. Complementary DNA (cDNA) libraries include

a. all the DNA in the genome
b. only genes with palindromic sequences
c. only the genes that are transcribed into mRNA
d. single-stranded DNA synthesized by reverse transcription

answer to 1st question should be c and 7th should be c

[QUOTE=minali]

Originally Posted by fluoride

1. Which of the following BEST describes the direction of synthesis for DNA, RNA and protein ?

DNA RNA Protein

a. 5' -> 3' 3' -> 5' C-terminal -> N-terminal
b. 5' -> 3', 3' ->5' 3' -> 5' N-terminal -> C-terminal
c. -> 3' 5' 5' -> 3' N-terminal -> C-terminal
d. 3' -> 5' 3' -> 5' N-terminal -> C-terminal
e. 5' -> 3', 3' ->5' 3' -> 5' C-terminal -> N-terminal


7. Complementary DNA (cDNA) libraries include

a. all the DNA in the genome
b. only genes with palindromic sequences
c. only the genes that are transcribed into mRNA
d. single-stranded DNA synthesized by reverse transcription

answer to 1st question should be c and 7th should be c

I'll say 7.D

Answers....

1. c
3. b
5. a
6. c
7. c
9. b

Tell me if i'm wrong

I think these are the answers to some of your questions - correct me if I'm wrong:

3) b
5) a
6) c
7) c
9) b
10) d
12) b
15) b
16) c
17) d
18 ) d
20) c
21) a

That's it for now.
dentistcs

Originally Posted by fluoride

1. Which of the following BEST describes the direction of synthesis for DNA, RNA and protein ?

DNA RNA Protein

a. 5' -> 3' 3' -> 5' C-terminal -> N-terminal
b. 5' -> 3', 3' ->5' 3' -> 5' N-terminal -> C-terminal
c. 5' -> 3' 5' -> 3' N-terminal -> C-terminal
d. 3' -> 5' 3' -> 5' N-terminal -> C-terminal
e. 5' -> 3', 3' ->5' 3' -> 5' C-terminal -> N-terminal

2. For which is the first group of the following pairs more likely to be located on the surface of a globular protein than the second group of the pair ?

a. -CONH2 -COO
b. -CH3 -CH(CH3)2
c. -CH20H -NH4
d. -CH3 -CH2OH
e. -CH2SH -COO

3. Which of the following describes the regulation of smooth muscle contraction ?

a. It requires troporun
b. It requires calmodulin
c. It does not require calcium
d. It does not requre myosin kinase
e. It does not require cross-bridge formation

4. A 0.2 mole/liter NaCl solution and a 0.2 mole/liter glucose solution are separated by a membrane that is impermeable to these solutes but is permeable to water. Which of the following statements is correct ?

a. There will be no net movement of water to either solution.
b. Water will go from the glucose to the saline solution
c. Water will go from the saline to the glucose solution
d. Concentration of glucose will decrease
e. Concentration of NaCl will increase

5. Stimulation of sympathetic adrenergic nerves to the blood vessels of an organ causes vasoconstriction because

a. alpha receptors are activated
b. beta receptors are activated
c. nicotinic receptors are activated
d. alpha receptors are inhibited
e. beta receptors are inhibited

6. What is the net change on glutamic acid at a pH of 1 ?

a. +2
b. +1
c. 0
d. -1
e. -2

7. Complementary DNA (cDNA) libraries include

a. all the DNA in the genome
b. only genes with palindromic sequences
c. only the genes that are transcribed into mRNA
d. single-stranded DNA synthesized by reverse transcription

8. A single impulse travels down an alpha motor axon. This results in which of the following ?

a. The activation of a single motor unit
b. The contraction of one muscle fiber
c. A subthreshold generator potential
d. A muscle action potential without contraction
e. Brief repetitive firing of muscle fibers

9. Which of the following portions of the elctrocardiogram corresponds to ventricular repolarization ?

a. P wave
b. T wave
c. PR interval
d. ST interval
e. QRS complex

10. Which of the following EKG intervals represents the propagation time of the cardiac impulse between the SA and AV nodes ?

a. QT
b. QR
c. ST
d. PR
e. QRS


11. Two pulp canals are usually found in which of the following ?

Tooth Root
a. Maxillary first premolar Lingual
b. Mandibular first molar Distal
c. Mandibular second molar Mesial

12. A deep lingual fossa and prominent marginal ridges are MOST characteristic of which of the following anterior teeth ?

a. Maxillary central incisor
b. Maxillary lateral incisor
c. Mandibular lateral incisor
d. Maxillary canine
e. Mandibular canine

13. Which of the following morphologic variations would worsen the prognosis for existing periodontal disease ?

a. Fused roots
b. Excessively long roots
c. Amelogenesis imperfecta
d. Shoveling trait in central incisors

14. Which of the following restorations is the LEAST likely to interfere with a patient's physiologic maximum intercuspal position contacts ?

a. Distolingual Class III on a maxillary right canine
b. MO on a mandibular right first premolar
c. MOD on a maxillary right second premolar
d. MO on a maxillary left first molar

15. Each of the following structures is normally exhibited by mandibular incisors EXCEPT one. Which one is this exception ?

a. Cingula
b. Mamelons
c. Lingual Fossae
d. Marginal ridges
e. Imbrication lines

16. When the mandible makes a right lateral excursion from an ideal intercuspal relation, the mesolingual cusp of the maxillary right first molar passes through which of the following mandibular structures ?

a. Embrasure between first and second molars
b. Embrasure between the first molar and second premolar
c. Lingual groove of the first molar
d. Distofacial groove of the first molar

17. When an adult with a normal occlusion moves the mandible from right lateral relation to maximum intercuspation, which cusp moves between the facial cusps of the maxillary right second molar ?

a. Distofacial of the mandibular first molar
b. Distal of the mandibular first molar
c. Mesofacial of the mandibular second molar
d. Distofacial of the mandibular second molar
e. Mesofacial of the mandibular third molar

18. Which of the following features is common to both mandibular first and second premolars ?

a. Triangular (in outline) occlusal table
b. Horizontal distal marginal ridge
c. Bilaterally symmetrical crown
d. Dissimailar marginal ridges
e. No transverse ridge

19. The contact area that is MOST nearly circular is located on the crown of which of the following maxillary premolars ?

a. Mesial of the first
b. Distal of the first
c. Mesial of the second
d. Distal of the second

20. Each of the following root surfaces on a mandibular first molar normally exhibits a longitudinal groove EXCEPT one. Which one is this EXCEPTION ?

Surface Root

a. Mesial Mesial
b. Distal Mesial
c. Mesial Distal
d. Distal Distal

21. Which of the following represents the MOST powerful muscle of mastication ?

a. Masseter
b. Temporalis
c. Geniohyoid
d. Lateral pterygoid
e. Sternocleidomastoid

Originally Posted by fluoride

1. Which of the following BEST describes the direction of synthesis for DNA, RNA and protein ?

DNA RNA Protein

a. 5' -> 3' 3' -> 5' C-terminal -> N-terminal
b. 5' -> 3', 3' ->5' 3' -> 5' N-terminal -> C-terminal
c. 5' -> 3' 5' -> 3' N-terminal -> C-terminal
d. 3' -> 5' 3' -> 5' N-terminal -> C-terminal
e. 5' -> 3', 3' ->5' 3' -> 5' C-terminal -> N-terminal

2. For which is the first group of the following pairs more likely to be located on the surface of a globular protein than the second group of the pair ?

a. -CONH2 -COO
b. -CH3 -CH(CH3)2
c. -CH20H -NH4
d. -CH3 -CH2OH
e. -CH2SH -COO

3. Which of the following describes the regulation of smooth muscle contraction ?

a. It requires troporun
b. It requires calmodulin
c. It does not require calcium
d. It does not requre myosin kinase
e. It does not require cross-bridge formation

4. A 0.2 mole/liter NaCl solution and a 0.2 mole/liter glucose solution are separated by a membrane that is impermeable to these solutes but is permeable to water. Which of the following statements is correct ?

a. There will be no net movement of water to either solution.
b. Water will go from the glucose to the saline solution
c. Water will go from the saline to the glucose solution
d. Concentration of glucose will decrease
e. Concentration of NaCl will increase

5. Stimulation of sympathetic adrenergic nerves to the blood vessels of an organ causes vasoconstriction because

a. alpha receptors are activated
b. beta receptors are activated
c. nicotinic receptors are activated
d. alpha receptors are inhibited
e. beta receptors are inhibited

6. What is the net change on glutamic acid at a pH of 1 ?

a. +2
b. +1
c. 0
d. -1
e. -2

7. Complementary DNA (cDNA) libraries include

a. all the DNA in the genome
b. only genes with palindromic sequences
c. only the genes that are transcribed into mRNA
d. single-stranded DNA synthesized by reverse transcription

8. A single impulse travels down an alpha motor axon. This results in which of the following ?

a. The activation of a single motor unit
b. The contraction of one muscle fiber
c. A subthreshold generator potential
d. A muscle action potential without contraction
e. Brief repetitive firing of muscle fibers

9. Which of the following portions of the elctrocardiogram corresponds to ventricular repolarization ?

a. P wave
b. T wave
c. PR interval
d. ST interval
e. QRS complex

10. Which of the following EKG intervals represents the propagation time of the cardiac impulse between the SA and AV nodes ?

a. QT
b. QR
c. ST
d. PR
e. QRS


11. Two pulp canals are usually found in which of the following ?

Tooth Root
a. Maxillary first premolar Lingual
b. Mandibular first molar Distal
c. Mandibular second molar Mesial

12. A deep lingual fossa and prominent marginal ridges are MOST characteristic of which of the following anterior teeth ?

a. Maxillary central incisor
b. Maxillary lateral incisor
c. Mandibular lateral incisor
d. Maxillary canine
e. Mandibular canine

13. Which of the following morphologic variations would worsen the prognosis for existing periodontal disease ?

a. Fused roots
b. Excessively long roots
c. Amelogenesis imperfecta
d. Shoveling trait in central incisors

14. Which of the following restorations is the LEAST likely to interfere with a patient's physiologic maximum intercuspal position contacts ?

a. Distolingual Class III on a maxillary right canine
b. MO on a mandibular right first premolar
c. MOD on a maxillary right second premolar
d. MO on a maxillary left first molar

15. Each of the following structures is normally exhibited by mandibular incisors EXCEPT one. Which one is this exception ?

a. Cingula
b. Mamelons
c. Lingual Fossae
d. Marginal ridges
e. Imbrication lines

16. When the mandible makes a right lateral excursion from an ideal intercuspal relation, the mesolingual cusp of the maxillary right first molar passes through which of the following mandibular structures ?

a. Embrasure between first and second molars
b. Embrasure between the first molar and second premolar
c. Lingual groove of the first molar
d. Distofacial groove of the first molar

17. When an adult with a normal occlusion moves the mandible from right lateral relation to maximum intercuspation, which cusp moves between the facial cusps of the maxillary right second molar ?

a. Distofacial of the mandibular first molar
b. Distal of the mandibular first molar
c. Mesofacial of the mandibular second molar
d. Distofacial of the mandibular second molar
e. Mesofacial of the mandibular third molar

18. Which of the following features is common to both mandibular first and second premolars ?

a. Triangular (in outline) occlusal table
b. Horizontal distal marginal ridge
c. Bilaterally symmetrical crown
d. Dissimailar marginal ridges
e. No transverse ridge

19. The contact area that is MOST nearly circular is located on the crown of which of the following maxillary premolars ?

a. Mesial of the first
b. Distal of the first
c. Mesial of the second
d. Distal of the second

20. Each of the following root surfaces on a mandibular first molar normally exhibits a longitudinal groove EXCEPT one. Which one is this EXCEPTION ?

Surface Root

a. Mesial Mesial
b. Distal Mesial
c. Mesial Distal
d. Distal Distal

21. Which of the following represents the MOST powerful muscle of mastication ?

a. Masseter
b. Temporalis
c. Geniohyoid
d. Lateral pterygoid
e. Sternocleidomastoid

i think the answers to some of the following questions are as follows . correct me if i am wrong
11-c
13-a
14-a
16-c
17-d
20-d

ans for 8th q is b

Originally Posted by RocknSun

ans for 8th q is b

Its a single motor unit...
its a)

moving this thread........

[QUOTE=minali]

Originally Posted by fluoride

1. Which of the following BEST describes the direction of synthesis for DNA, RNA and protein ?

DNA RNA Protein

a. 5' -> 3' 3' -> 5' C-terminal -> N-terminal
b. 5' -> 3', 3' ->5' 3' -> 5' N-terminal -> C-terminal
c. -> 3' 5' 5' -> 3' N-terminal -> C-terminal
d. 3' -> 5' 3' -> 5' N-terminal -> C-terminal
e. 5' -> 3', 3' ->5' 3' -> 5' C-terminal -> N-terminal


7. Complementary DNA (cDNA) libraries include

a. all the DNA in the genome
b. only genes with palindromic sequences
c. only the genes that are transcribed into mRNA
d. single-stranded DNA synthesized by reverse transcription

answer to 1st question should be c and 7th should be c

can someone explain the answers for questions 1 and 2 above ?

Originally Posted by panamh

i think the answers to some of the following questions are as follows . correct me if i am wrong
11-c
13-a
14-a
16-c
17-d
20-d

19 ) answer is D

[QUOTE=fluoride]

Originally Posted by minali

can someone explain the answers for questions 1 and 2 above ?

1:
DNA/RNA polymerase reads the template 3’->5’ direction. So the 5’ end of the complementary strand is synthesized first (cf. Ribosome reads the template 5'->3' direction). I just remember that ‘N’ terminus of the ‘n’ascent protein is synthesized first.

Answers:

Originally Posted by fluoride

1. Which of the following BEST describes the direction of synthesis for DNA, RNA and protein ?

DNA RNA Protein

a. 5' -> 3' 3' -> 5' C-terminal -> N-terminal
b. 5' -> 3', 3' ->5' 3' -> 5' N-terminal -> C-terminal
c. 5' -> 3' 5' -> 3' N-terminal -> C-terminal
d. 3' -> 5' 3' -> 5' N-terminal -> C-terminal
e. 5' -> 3', 3' ->5' 3' -> 5' C-terminal -> N-terminal
ans: c

2. For which is the first group of the following pairs more likely to be located on the surface of a globular protein than the second group of the pair ?

a. -CONH2 -COO
b. -CH3 -CH(CH3)2
c. -CH20H -NH4
d. -CH3 -CH2OH
e. -CH2SH -COO
answ: a

3. Which of the following describes the regulation of smooth muscle contraction ?

a. It requires troporun
b. It requires calmodulin
c. It does not require calcium
d. It does not requre myosin kinase
e. It does not require cross-bridge formation
ans:b

4. A 0.2 mole/liter NaCl solution and a 0.2 mole/liter glucose solution are separated by a membrane that is impermeable to these solutes but is permeable to water. Which of the following statements is correct ?

a. There will be no net movement of water to either solution.
b. Water will go from the glucose to the saline solution
c. Water will go from the saline to the glucose solution
d. Concentration of glucose will decrease
e. Concentration of NaCl will increase
ans:a

5. Stimulation of sympathetic adrenergic nerves to the blood vessels of an organ causes vasoconstriction because

a. alpha receptors are activated
b. beta receptors are activated
c. nicotinic receptors are activated
d. alpha receptors are inhibited
e. beta receptors are inhibited
ans:a

6. What is the net change on glutamic acid at a pH of 1 ?

a. +2
b. +1
c. 0
d. -1
e. -2
ans:b

7. Complementary DNA (cDNA) libraries include

a. all the DNA in the genome
b. only genes with palindromic sequences
c. only the genes that are transcribed into mRNA
d. single-stranded DNA synthesized by reverse transcription
answ:c

8. A single impulse travels down an alpha motor axon. This results in which of the following ?

a. The activation of a single motor unit
b. The contraction of one muscle fiber
c. A subthreshold generator potential
d. A muscle action potential without contraction
e. Brief repetitive firing of muscle fibers
answ:c

9. Which of the following portions of the elctrocardiogram corresponds to ventricular repolarization ?

a. P wave
b. T wave
c. PR interval
d. ST interval
e. QRS complex
answ:b

10. Which of the following EKG intervals represents the propagation time of the cardiac impulse between the SA and AV nodes ?

a. QT
b. QR
c. ST
d. PR
e. QRS
answ:c

14 is b

Somebody posted this question and asked for an answer. Some said A, some said B. Does anybody know whether A or B is correct? Thanks! (Question is below)
---------------------

14. Which of the following restorations is the LEAST likely to interfere with a patient's physiologic maximum intercuspal position contacts ?

a. Distolingual Class III on a maxillary right canine
b. MO on a mandibular right first premolar
c. MOD on a maxillary right second premolar
d. MO on a maxillary left first molar

Originally Posted by ckow

Somebody posted this question and asked for an answer. Some said A, some said B. Does anybody know whether A or B is correct? Thanks! (Question is below)
---------------------

14. Which of the following restorations is the LEAST likely to interfere with a patient's physiologic maximum intercuspal position contacts ?

a. Distolingual Class III on a maxillary right canine
b. MO on a mandibular right first premolar
c. MOD on a maxillary right second premolar
d. MO on a maxillary left first molar

answer is B 100% Nothing contacts the M of mand Pm1, so it won't interfere with MI.

aseptic embolism originates from?

heart
lungs
brain
liver

Originally Posted by RocknSun

aseptic embolism originates from?

heart
lungs
brain
liver

I would say heart, but I'm not sure. I remember something about aseptic embolisms originating from artificial valves or catethers placed in the heart.

Originally Posted by Jo23

answer is B 100% Nothing contacts the M of mand Pm1, so it won't interfere with MI.

Thanks Jo23!