Some Biology ?s

[Beagle]

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these are questions from the online Kaplan free test, but I do not have answers...any help is appreciated!

1. Which of the following illustrates the principle of induction in invertebrates
A. in an embryo, the presenve of a notochord beneath the ectoderm results in the formation of a neural tube
B. A neuron synapses with antoher neuron via a neurotransmitter
C. Eye muscles contrstict in responce to light
D. The maternal parent induces spontaneous expression of recessive genes

I thought the answer was A, but then if you look carefully, the question is asking about INVERTEBRATEs????


2. If two individuals with geneotypes AaBbCc mate, what is the probability that they will produce offspring with geneotype AABBCC?
A. 1/64
B. 1/32
C. 1/16
D. 1/4
E. 1/2
How do you even do this problem?

3. Muscle movement on the cellular level is initated by the release of CA from the terminal cisternae. Terminal cisternae are associated with
a. sarcoplasmic reticulum
B. myosin-cross bridges
C. myoglobin
D. caniliculi
E. Thin filaments

Anyone know the answer? Is this ? too picky?


4. Inbreeding within a population is likely to lead to:
A. an increased number of mutations
B. an increased expression of recessive traits
C. An increased expression of dominant traits
???? They all sound good to me!

5. According to the first law of thermodynamics
A. energy transfer leads to less organization
B. A system that is isolated from any energy source increase in entropy
C. Evolution is possibly through the absorption of energy
D. Energy is balanced by living organisms
E. Total energy in an isolated system remains constant

Is the answer E???


6. According to the second law of thermodynamics
1. matter cannot be destroyed or created
2. conservation of heat to work leads to less organization
3. entropy is unchanged or increases following a thermodynamic process
A. 1 only
B. 2 only
C. 1 and 3
D. 2 and 3
E. 1,2, and 3


Thanks so much!!!

 

[nycdoc]

For #2, if I remember correctly, do a punnet square for each trait.
Aa X Aa = 1 AA, 2 Aa, 1aa. So the chance of getting an AA is 1/4.
This is the same for each of the other crosses:Bb XBb=1/4 BB
Cc X Cc=1/4 CC. Now multiply the 3: 1/4 X 1/4 X 1/4 and you get 1/64

 

[DesiDentist]

Originally posted by Beagle
these are questions from the online Kaplan free test, but I do not have answers...any help is appreciated!

1. Which of the following illustrates the principle of induction in invertebrates
A. in an embryo, the presenve of a notochord beneath the ectoderm results in the formation of a neural tube
B. A neuron synapses with antoher neuron via a neurotransmitter
C. Eye muscles contrstict in responce to light
D. The maternal parent induces spontaneous expression of recessive genes

I thought the answer was A, but then if you look carefully, the question is asking about INVERTEBRATEs????

I don't know about this one. Induction is the process by which cells begin to differentiate. Granted A is geared towards invertebrates but still that seems to be the right one to me. If I had to guess otherwise, I would pick B since in the brain during child development neurons are synapsing and "wiring" with each other. But since this question is so screwed up i'm lost as well.


2. If two individuals with geneotypes AaBbCc mate, what is the probability that they will produce offspring with geneotype AABBCC?
A. 1/64
B. 1/32
C. 1/16
D. 1/4
E. 1/2
How do you even do this problem?

It's too early for me to do this, sorry. But will look at this later if anyone can help us that would be great. If I were to guess I would guess E.

3. Muscle movement on the cellular level is initated by the release of CA from the terminal cisternae. Terminal cisternae are associated with
a. sarcoplasmic reticulum
B. myosin-cross bridges
C. myoglobin
D. caniliculi
E. Thin filaments

Anyone know the answer? Is this ? too picky?

It is sacroplasmic reticulum, answer A


4. Inbreeding within a population is likely to lead to:
A. an increased number of mutations
B. an increased expression of recessive traits
C. An increased expression of dominant traits
???? They all sound good to me!

I would pick B, even though A seems to be correct as well since the main thing about inbreeding is that recessive alleles are more likely to appear in the phenotype which is not a mutation, but a recessive, rare, allele that normally would not surface in a random mating and will cause complications.

5. According to the first law of thermodynamics
A. energy transfer leads to less organization
B. A system that is isolated from any energy source increase in entropy
C. Evolution is possibly through the absorption of energy
D. Energy is balanced by living organisms
E. Total energy in an isolated system remains constant

Is the answer E???

I would agree with you on this one.

6. According to the second law of thermodynamics
1. matter cannot be destroyed or created
2. conservation of heat to work leads to less organization
3. entropy is unchanged or increases following a thermodynamic process
A. 1 only
B. 2 only
C. 1 and 3
D. 2 and 3
E. 1,2, and 3

2 is definately right, but i'm not sure about 3. If i had to guess i would choose B, I would choose D if 3 stated "entropy increases following a thermodynamic process.


Thanks so much!!!

It's early. If I made any mistakes please correct me.

DesiDentist

 

[ItsGavinC]

I agree with Desi's answers:
1 - A
2 - E
3 - A
4 - B
5 - E
6 - B

But be forewarned, the answer key for that online test is incorrect. Also, you can miss only 4 questions on the online Bio section and you'll still get an 18 overall. The database for grading/scoring the online kap test is loaded with problems.

Use this exam to get your brain thinking, but don't gauge your performance by it.

 

[johnkimx1]

number 1 is A
under chordates there are amphioxus (lancelets and tunicates) who are invertebrates

good luck

 

[samurai361]

uh no Gavin and Desi are wrong on #2, it's definitely done the way nycdoc described.

(probability of AA * probability of BB * probability of CC)

Do a punnet square for each individual probability, ie for A:
AA Aa
Aa aa

So (1/4) * (1/4) * (1/4) = 1/64

I am 100% certain.

 

[khangreen]

Regarding 4, A would not be right since the possibility of a mutation is always constant. Inbreeding means they have the same recessive genes and have higher chance to produce a homozygous recessive individual than if it were random mating withing a larger population.