[BIO] question

[299678]

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Followings are DAT like questions, Need ur brief explanation to support your answer


1. All of the following cellular events involve actin filaments except?
a) amoeboid movment
b) cytoplasmic streaming
c) cytokinesis
d) contraction in smooth muscle
e) flagella movement in bacteria


2. Eukaryotic and prokaryotic cells share all of the following features except?
a) Ribosome dependent protein synthesis
b) ATP synthesis linked to a proton gradient
c) a selectively permeable plasma membrane
d) a cytoskeleton of tubulin
e) a semiconserative replication of DNA

3. During which of the following stages of the cell cycle will a diploid cell contain twice the amount of DNA found in a gamete?
a) prophase
b) Entire S phase
c) ENtire G1 phase
d) Entire G2 phase
e) Metaphase

 

[casper22]

Wild Guess....C

 

[txlonghorn]

C, involves intermediary filaments. However, I thought smooth muscle wasn't striated, but I guess it still has actin? Also, flagella has microtubles, so not sure where actin comes in.

 

[txlonghorn]

I mean microfilaments, but even that is wrong.lol.

The answer should be e - bacteria have flaggelin or something like that.

2.C? I think cause gram neg will have an outter membrane?

3. C - gamete will have 23 chromosomes w/o chromatids. Only G1 from the answer choices has no chromatids attached, so it is equal to 46

 

[299678]

Thanks Txlonghorn you were only wrong for second question. COrrect answer is d)

I still don't get the reason for #3, during S phage, there is chromosome replication, so it should be the answer?

 

[UCB05]

1. E: Bacterial flagella use a different mechanism than eukaryotic flagella. Bacteria have flagellin rather than actin.

2. D: Similarly, I don't think bacteria have tubulin in their cytoskeletons, though they have some structural analogs.

3: C: Gametes have only half the normal diploid complement. The only phase in a diploid cycle that has twice this amount is during G1. During S phase, diploid DNA is replicated, so at the end of S, a diploid cell has 4x the amount of DNA as a gamete. Consequently it will have 4x the amount through G2 and most of mitosis, so C is the only correct answer.

edit answering above post: B says "Entire S phase" which is not true because it will have more than double the DNA amount by the end of that phase.

 

[299678]

UCBO5 thanks for your inputs. I really appreciate it

Could you be able to tell me how you study bio?

 

[UCB05]

UCBO5 thanks for your inputs. I really appreciate it

Could you be able to tell me how you study bio?

np. I studied straight out of a textbook first, then used Schaums, Barrons, and Cliffs review books. I just kept reading =/ Honestly though, I don't know if I'd have known the answer to the second question if I weren't a MoCell Bio major.

 

[299678]

Yeah always someone who got high score on DAT BIO, they all said the same, Textbook ~

Thank you

 

[DQLEUCD]

Followings are DAT like questions, Need ur brief explanation to support your answer


1. All of the following cellular events involve actin filaments except?
a) amoeboid movment
b) cytoplasmic streaming
c) cytokinesis
d) contraction in smooth muscle
e) flagella movement in bacteria


2. Eukaryotic and prokaryotic cells share all of the following features except?
a) Ribosome dependent protein synthesis
b) ATP synthesis linked to a proton gradient
c) a selectively permeable plasma membrane
d) a cytoskeleton of tubulin
e) a semiconserative replication of DNA

3. During which of the following stages of the cell cycle will a diploid cell contain twice the amount of DNA found in a gamete?
a) prophase
b) Entire S phase
c) ENtire G1 phase
d) Entire G2 phase
e) Metaphase

I need to study more bio.