Question 1

What is the site of protein synthesis in the cell?

Accepted Answer

A)   Ribosome
B)   Nucleus
C)   Nucleolus
D)   Smooth endoplasmic reticulum
E)   Eukaryotic chromosome

Question 2

In a wild- type strain of fruit flies, the length of a gene from the start to the stop codon is 2,000 DNA bases. Suppose an experiment indicated that the mRNA molecule transcribed from this gene is much shorter (only 1,200 bases) . What is the most likely explanation for this?

Accepted Answer

A)   The first 800 bases of DNA are always cut out as it is transcribed into mRNA.
B)   The mRNA was prematurely degraded.
C)   There are introns in the DNA that were cut out of the mRNA.
D)   A mutation caused the formation of an extra stop codon in the gene.

Question 3

Which point mutation would be most likely to have a catastrophic effect?

Accepted Answer

A)   A base substitution
B)   A base deletion near the start of the coding sequence
C)   A base deletion near the end of the coding sequence
D)   A base insertion near the end of the coding sequence
E)   The deletion of three bases near the start of the coding sequence

Question 4

In eukaryotic cells, occurs in the nucleus, resulting in the production of mRNA, which then travels to the ribosome for into an amino acid chain.

Accepted Answer

transcript...

Question 5

Imagine that the short DNA base sequence GGCTGC is transcribed and then translated by a ribosome. The follo activated tRNA molecules are available in the cytoplasm:  What resulting dipeptide will form?

Accepted Answer

A)   Alanine- alanine
B)   Threonine- glycine
C)   Cysteine- alanine
D)   Proline- threonine
E)   Glycine- cysteine

Question 6

Suppose one strand of a "mini- gene" has the base sequence TACCCGGATTCA. If we assume no introns are involved, how many amino acids does the polypeptide encoded by this gene have?

Accepted Answer

A)   12
B)   4
C)   2
D)   6

Question 7

A "mini- gene" has the base sequence TACCCGTGCACG. If the T at the beginning of the sequence is deleted, what will be the consequence?

Accepted Answer

A)   The first nucleotide is always replaced anyway, so there will be no change.
B)   RNA polymerase will correct the deletion, and a normal protein will be produced.
C)   All of the codons after that point will be changed.
D)   Only the amino acid coded for in that codon will be changed.
E)   RNA polymerase will skip that codon, but all the others will be read normally.

Question 8

What is the anticodon for AUC?

Accepted Answer

A)   AUC
B)   TAG
C)   CUA
D)   UAG
E)   GAU

Question 9

The sequence of nitrogen- containing bases on one strand of DNA could determine all of the following EXCEPT the sequence of

Accepted Answer

A)   amino acids in a protein molecule.
B)   ribose and phosphate molecules in tRNA.
C)   nitrogen- containing bases in mRNA.
D)   nitrogen- containing bases in the other DNA strand.

Question 10

Steroid hormones have the ability to regulate transcription.

Accepted Answer

A) True 
 B)False

Question 11

In females, an entire X chromosome is inactivated in each cell. The inactivated X chromosome is called the
.

Accepted Answer

The answer of In females, an entire X chromosome is...

Question 12

If a tRNA molecule that is specialized for the transfer of the amino acid valine has the anticodon CAG, it will couple with the codon

Accepted Answer

A)   GTC.
B)   TUG.
C)   CAG.
D)   GAC.
E)   GUC.

Question 13

The sequence of nitrogen- containing bases on one strand of DNA most directly determines the sequence of

Accepted Answer

A)   sugars in a polysaccharide molecule.
B)   amino acids in a protein molecule.
C)   fatty acids in a fat molecule.
D)   bases in a protein molecule.

Question 14

What is an anticodon?

Accepted Answer

A)   Three consecutive amino acids in a protein
B)   Three consecutive bases in mRNA
C)   Three consecutive bases in tRNA
D)   The beginning of a DNA molecule
E)   Four consecutive bases in tRNA

Question 15

Suppose one strand of a "mini- gene" has the base sequence TACCCGGATTCA. The last codon in the mRNA sequence will be

Accepted Answer

A)   AGU.
B)   UGA.
C)   TCA.
D)   AGT.

Question 16

Transcription is the process of

Accepted Answer

A)   synthesizing an RNA molecule using a DNA template.
B)   synthesizing a protein using information from mRNA.
C)   synthesizing a DNA molecule from an RNA template.
D)   replicating a single- stranded DNA molecule.
E)   assembling an RNA molecule without a template.

Question 17

List three ways in which an RNA molecule differs from a DNA molecule.

Accepted Answer

RNA is normally single- strand...

Question 18

The anticodon for the codon AUC is .

Accepted Answer

The answer of The anticodon for the codon AUC is...

Question 19

A tRNA that carries a specific amino acid enters the protein- synthesizing machinery at the ribosomes and pairs with the appropriate

Accepted Answer

A)   anticodon.
B)   amino acid.
C)   charge.
D)   codon.

Question 20

Which of the following is found in RNA but NOT in DNA?

Accepted Answer

A)   Adenine
B)   Thymine
C)   Uracil
D)   Deoxyribose
E)   Phosphate groups

Exam 13: Gene Expression and Regulation

The sequence of nitrogen- containing bases on one strand of DNA most directly determines the sequence of

Correct AnswerverifiedShow Answer

In eukaryotic cells, occurs in the nucleus, resulting in the production of mRNA, which then travels to the ribosome for into an amino acid chain.

Correct Answerverifiedtranscript...View AnswerShow Answer

A "mini- gene" has the base sequence TACCCGTGCACG. If the T at the beginning of the sequence is deleted, what will be the consequence?

Correct AnswerverifiedShow Answer

If a tRNA molecule that is specialized for the transfer of the amino acid valine has the anticodon CAG, it will couple with the codon

Correct AnswerverifiedShow Answer

In females, an entire X chromosome is inactivated in each cell. The inactivated X chromosome is called the .

Correct AnswerverifiedShow Answer

What is an anticodon?

Correct AnswerverifiedShow Answer

Suppose one strand of a "mini- gene" has the base sequence TACCCGGATTCA. If we assume no introns are involved, how many amino acids does the polypeptide encoded by this gene have?

Correct AnswerverifiedShow Answer

The anticodon for the codon AUC is .

Correct AnswerverifiedShow Answer

In a wild- type strain of fruit flies, the length of a gene from the start to the stop codon is 2,000 DNA bases. Suppose an experiment indicated that the mRNA molecule transcribed from this gene is much shorter (only 1,200 bases) . What is the most likely explanation for this?

Correct AnswerverifiedShow Answer

Suppose one strand of a "mini- gene" has the base sequence TACCCGGATTCA. The last codon in the mRNA sequence will be

Correct AnswerverifiedShow Answer

Which of the following is found in RNA but NOT in DNA?

Correct AnswerverifiedShow Answer

List three ways in which an RNA molecule differs from a DNA molecule.

Correct AnswerverifiedRNA is normally single- strand...View AnswerShow Answer

Which point mutation would be most likely to have a catastrophic effect?

Correct AnswerverifiedShow Answer

Steroid hormones have the ability to regulate transcription.

Correct AnswerverifiedShow Answer

Imagine that the short DNA base sequence GGCTGC is transcribed and then translated by a ribosome. The follo activated tRNA molecules are available in the cytoplasm: What resulting dipeptide will form?

Correct AnswerverifiedShow Answer

The sequence of nitrogen- containing bases on one strand of DNA could determine all of the following EXCEPT the sequence of

Correct AnswerverifiedShow Answer

A tRNA that carries a specific amino acid enters the protein- synthesizing machinery at the ribosomes and pairs with the appropriate

Correct AnswerverifiedShow Answer

What is the anticodon for AUC?

Correct AnswerverifiedShow Answer

What is the site of protein synthesis in the cell?

Correct AnswerverifiedShow Answer

Transcription is the process of

Correct AnswerverifiedShow Answer

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RNA is normally single- strand...
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