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Cell Cycle/DNA/RNA Unanswered Questions


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#1 Anastasia

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Posted 17 April 2004 - 10:04 AM

im having some trouble with these cell cycle types of questions. i'd really appreciate it if someone could answer any of them, even if you only know a couple..

1. In eukaryotic multicellular organisms, cell division serves all of these purposes except
(a) growth
(B) maintenance
© reproduction of new individuals
(d) repair

2. Which of the following statements is true?
(a) The cell cycle is similar in all eukaryotes.
(B) The cell cycle is totally dissimilar in different eukaryotes.
© The cell cycle may exhibit different stages in different eukaryotes.
(d) None of these statements are true.

3. Adult cells that do not, or rarely, divide will be found primarily in what phase of the cell cycle?
(a) G1
(B) G0
© S
(d) G2

4. Division of the whole eukaryotic cell is called
(a) replication
(B) fission
© differentiation
(d) cytokinesis

5. Transmission of hereditary information is associated with
(a) cilia
(B) chromosomes
© centromeres
(d) ribosomes

6. When a cell with 24 chromosomes during G1 phase divides by mitotic cell division, the resulting offspring cells will each have a maximum chromosome number of
(a) 6
(B) 12
© 24
(d) 48

7. A scientist was collecting data about the number of chromosomes that a certain organism had. Most of the skin cells that he examined had a certain amount of chromosomal material, but he found some skin cells with double the chromosomal material. What might be the explanation for these findings?
(a) His samples were contaminated.
(B) Some skin cells were in the G2 phase.
© The cell cycle for the organism was in the G1 phase.
(d) Some skin cells had mutated and formed cancer cells.

8. Mutations
(a) involve any change in the sequence of a cell's DNA
(B) are always harmful to the cell
© are always inherited by daughter cells after cell division
(d) are all of the above

9. Each strand of a double-stranded chromosome is known as a
(a) centromere
(B) chromatid
© homolog
(d) fragment

10. DNA controls protein synthesis by
(a) encoding amino-acid sequence
(B) activating enzymes
© organizing molecules
(d) directly copying proteins

11. mRNA carries the genetic code of DNA because
(a) the mRNA has a sequence complimentary to the DNA
(B) mRNA has a different code than DNA
© the mRNA is randomly assembled
(d) mRNA contains uracil instead of thymine nucleotides

12. What are the differences among translation, transcription, and replication?

13. What are the many uses of protein in a eukaryote?

Edited by Anastasia, 17 April 2004 - 10:08 AM.


#2

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Posted 17 April 2004 - 04:53 PM

These are what I could answer, let's see what score I can get:

1. In eukaryotic multicellular organisms, cell division serves all of these purposes except
(a) growth
(:huh: maintenance
reproduction of new individuals
(d) repair

D

2. Which of the following statements is true?
(a) The cell cycle is similar in all eukaryotes.
(B) The cell cycle is totally dissimilar in different eukaryotes.
The cell cycle may exhibit different stages in different eukaryotes.
(d) None of these statements are true.

C?

3. Adult cells that do not, or rarely, divide will be found primarily in what phase of the cell cycle?
(a) G1
(B) G0
S
(d) G2

B


5. Transmission of hereditary information is associated with
(a) cilia
(B) chromosomes
centromeres
(d) ribosomes
B

6. When a cell with 24 chromosomes during G1 phase divides by mitotic cell division, the resulting offspring cells will each have a maximum chromosome number of
(a) 6
(B) 12
24
(d) 48
C

7. A scientist was collecting data about the number of chromosomes that a certain organism had. Most of the skin cells that he examined had a certain amount of chromosomal material, but he found some skin cells with double the chromosomal material. What might be the explanation for these findings?
(a) His samples were contaminated.
(B) Some skin cells were in the G2 phase.
The cell cycle for the organism was in the G1 phase.
(d) Some skin cells had mutated and formed cancer cells.
B

8. Mutations
(a) involve any change in the sequence of a cell's DNA
(B) are always harmful to the cell
are always inherited by daughter cells after cell division
(d) are all of the above
A

9. Each strand of a double-stranded chromosome is known as a
(a) centromere
(B) chromatid
homolog
(d) fragment
B

10. DNA controls protein synthesis by
(a) encoding amino-acid sequence
(B) activating enzymes
organizing molecules
(d) directly copying proteins
A

11. mRNA carries the genetic code of DNA because
(a) the mRNA has a sequence complimentary to the DNA
(B) mRNA has a different code than DNA
the mRNA is randomly assembled
(d) mRNA contains uracil instead of thymine nucleotides
A

12. What are the differences among translation, transcription, and replication?
Translation is the process that takes the information passed from DNA as messenger RNA and turns this into a series of amino acids bound together with peptide bonds. It really is a translation from one code, nucleotide sequence, to another code, amino acid sequence.
Transcription is the process of translation from DNA sequence to mRNA sequence.
Replication is the process of duplicating the entire chromosome in preparation for cell division and the equaldistribution of the genetic material to the daughter cells.

#3 kant0008

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Posted 21 April 2004 - 10:06 PM

Hi!
I do apologise, but I believe some of the answers above are incorrect.
Here's my version, choose whichever you like:
1=C
2= (not 100%sure, but A sounds closer to the truth)
4=B
8= A (no doubt about this one!)
10=A
11=A
Good luck!




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