Question 1

Aminoacyl-tRNA synthetase is the enzyme that

Accepted Answer

A)  folds tRNA molecules into their proper configuration.
B)  causes tRNA molecules to bind to the aminoacyl site of a ribosome.
C)  produces tRNA by "reading" DNA molecules.
D)  adds the appropriate amino acid to an uncharged tRNA. D

Question 2

Ribosomes are composed of

Accepted Answer

A)  tRNA and protein.
B)  mRNA and protein.
C)  rRNA and protein.
D)  only proteins folded together.

Question 3

A tRNA molecule looks like a compact ____ when it is folded into its functional configuration.

Accepted Answer

A)  G
B)  L
C)  C
D)  P

Question 4

A neomorphic mutation results in an allele that

Accepted Answer

A)  produces no gene product.
B)  produces a nonfunctional gene product.
C)  produces novel proteins or cause inappropriate expression resulting in a new phenotype.
D)  produces proteins that aggregate with wild-type subunits, inactivating them.
E)  produces an altered protein that results in a wild-type phenotype. Blooms Level 2: Understand

Question 5

In the usual flow of genetic information (often called the Central Dogma) , which of the following best represents the expression of genes?

Accepted Answer

A)  Protein-RNA-DNA
B)  DNA-RNA-Protein
C)  RNA-DNA-Protein
D)  DNA-Protein-RNA

Question 6

Which of the following is required for initiation of eukaryotic translation?

Accepted Answer

A)  Shine-Dalgarno sequence
B)  5' cap
C)  3' poly(
A)   tail
D)  N-formylmethionine
E)  IntronsBlooms Level 1: Remember

Question 7

Drugs like AZT, ddC, or ddI work against the AIDS virus because they

Accepted Answer

A)  destroy viral proteins.
B)  prevent the formation of viral mRNA.
C)  block the action of viral tRNA.
D)  look like nitrogenous bases and block viral reverse transcriptase.

Question 8

The cellular organelle responsible for protein synthesis is the

Accepted Answer

A)  nucleus.
B)  mitochondria.
C)  centrioles.
D)  ribosome.

Question 9

Which of these terms is NOT used as a nickname for a stop codon?

Accepted Answer

A)  emerald
B)  amber
C)  opal
D)  ochre

Question 10

A codon is a three-base sequence of

Accepted Answer

A)  mRNA that codes for an amino acid.
B)  rRNA that codes for an amino acid.
C)  tRNA that codes for an amino acid.
D)  DNA that codes for an amino acid.

Question 11

A mutation that is characterized by a change in the DNA sequence, but no change in the resulting protein sequence, is called a

Accepted Answer

A)  frameshift mutation.
B)  missense mutation.
C)  silent mutation.
D)  nonsense mutation.

Question 12

In the modification of eukaryotic mRNA, a "cap" consisting of a/an _________ and a tail consisting of _______ are usually added to the transcript.

Accepted Answer

A)  acetyl group, multiple cytosines
B)  multiple guanines, methyl group
C)  multiple thymines, acetyl group
D)  methyl group, multiple adenines

Question 13

A typical example of a genetic system that employs RNA splicing is

Accepted Answer

A)  the genes that code for the segments in an earthworm.
B)  the genes responsible for making antibodies in humans.
C)  the HIV virus genes.
D)  the genes that enable RNA splicing. B

Question 14

The retroviruses, including HIV, are unique because they do reverse

Accepted Answer

A)  replication.
B)  transcription.
C)  splicing.
D)  translation.

Question 15

RNA polymerase binds to a sequence called a/an ______________ before beginning transcription.

Accepted Answer

A)  promoter
B)  operator
C)  structural gene
D)  replication origin

Question 16

Nonsense codons are

Accepted Answer

A)  codons that code for multiple amino acids.
B)  codons that do not code for an amino acid.
C)  codons that can be read forward or backward.
D)  start codons.

Question 17

A mutation that changes a codon sequence, and subsequently changes the amino acid that should have been placed at that point in the polypeptide chain, is called a

Accepted Answer

A)  frameshift mutation.
B)  missense mutation.
C)  silent mutation.
D)  nonsense mutation.

Question 18

Experiments that are done inside a living cell are describe by the Latin term

Accepted Answer

A)  in vino.
B)  in vito.
C)  in vivo.
D)  in vitro.

Question 19

Experiments that are done outside a living cell are describe by the Latin term

Accepted Answer

A)  in vino.
B)  in vito.
C)  in vivo.
D)  in vitro.

Question 20

In the digestive system, some protease enzymes must be secreted as an inactive form and then activated later by proteolytic cleavage once outside of the secreting cell.This is to prevent active proteases from damaging the secreting cells.What is the category of precursor proteins of this type?

Accepted Answer

A)  Ubiquitins
B)  Zymogens
C)  Glycosides
D)  Activins B

Exam 8: Gene Expression: The Flow of Information From DNA to RNA to Protein

Aminoacyl-tRNA synthetase is the enzyme that

Correct AnswerverifiedD

Ribosomes are composed of

Correct AnswerverifiedShow Answer

A tRNA molecule looks like a compact ____ when it is folded into its functional configuration.

Correct AnswerverifiedShow Answer

A neomorphic mutation results in an allele that

Correct AnswerverifiedShow Answer

In the usual flow of genetic information (often called the Central Dogma) , which of the following best represents the expression of genes?

Correct AnswerverifiedShow Answer

Which of the following is required for initiation of eukaryotic translation?

Correct AnswerverifiedShow Answer

Drugs like AZT, ddC, or ddI work against the AIDS virus because they

Correct AnswerverifiedShow Answer

The cellular organelle responsible for protein synthesis is the

Correct AnswerverifiedShow Answer

Which of these terms is NOT used as a nickname for a stop codon?

Correct AnswerverifiedShow Answer

A codon is a three-base sequence of

Correct AnswerverifiedShow Answer

A mutation that is characterized by a change in the DNA sequence, but no change in the resulting protein sequence, is called a

Correct AnswerverifiedShow Answer

In the modification of eukaryotic mRNA, a "cap" consisting of a/an _________ and a tail consisting of _______ are usually added to the transcript.

Correct AnswerverifiedShow Answer

A typical example of a genetic system that employs RNA splicing is

Correct AnswerverifiedB

The retroviruses, including HIV, are unique because they do reverse

Correct AnswerverifiedShow Answer

RNA polymerase binds to a sequence called a/an ______________ before beginning transcription.

Correct AnswerverifiedShow Answer

Nonsense codons are

Correct AnswerverifiedShow Answer

A mutation that changes a codon sequence, and subsequently changes the amino acid that should have been placed at that point in the polypeptide chain, is called a

Correct AnswerverifiedShow Answer

Experiments that are done inside a living cell are describe by the Latin term

Correct AnswerverifiedShow Answer

Experiments that are done outside a living cell are describe by the Latin term

Correct AnswerverifiedShow Answer

In the digestive system, some protease enzymes must be secreted as an inactive form and then activated later by proteolytic cleavage once outside of the secreting cell.This is to prevent active proteases from damaging the secreting cells.What is the category of precursor proteins of this type?

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In the modification of eukaryotic mRNA, a "cap" consisting of a/an ___ and a tail consisting of _ are usually added to the transcript.

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B

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