Question 1

How many codons specify the amino acid leucine?

Accepted Answer

A)   two
B)   three
C)   four
D)   five
E)   six

Question 2

The activity of the ribosome in translation is analogous to a(n)  _____.

Accepted Answer

A)   assembly line
B)   dance
C)   planet racing around the sun
D)   foot race
E)   chess game

Question 3

A Barr body exists for the purpose of _____.

Accepted Answer

A)   gene dosage compensation
B)   insuring fertilization
C)   blocking the activity of the Y chromosome
D)   turning on the SRY gene
E)   activating master genes

Question 4

Epigenetic modifications _____.

Accepted Answer

A)   are considered evolutionary
B)   are completely reset during development
C)   alter the DNA sequence
D)   can persist for generations
E)   respond less rapidly to environmental changes than altering the DNA sequence

Question 5

Amino acids are carried to ribosomes by____ RNA.

Accepted Answer

A)   template
B)   messenger
C)   transfer
D)   ribosomal
E)   retriever

Question 6

During transcription, adenine is complementary to _____.

Accepted Answer

A)   guanine
B)   adenine
C)   cytosine
D)   uracil
E)   guanine and cytosine

Question 7

Which type of mutation results in sickle-cell anemia?

Accepted Answer

A)   base-pair substitution
B)   insertion
C)   deletion
D)   frameshift
E)   gene duplication

Question 8

The tightly condensed nonfunctional X chromosome is called a(n)  _____.

Accepted Answer

A)   Barr body
B)   Y chromosome
C)   autosome
D)   X-linked chromosome
E)   Watson segment

Question 9

How many different codons in our genetic code specify amino acids?

Accepted Answer

A)   3
B)   20
C)   60
D)   61
E)   64

Question 10

Ricin exerts its effects on a human cell by _____.

Accepted Answer

A)   inactivating synthesis of carbohydrates
B)   inhibiting hydrolysis of carbohydrates
C)   preventing protein synthesis
D)   interfering with hydrolysis of lipids
E)   over activating nucleic acid metabolism

Question 11

Which of the following carries amino acids to ribosomes?

Accepted Answer

A)   mRNA
B)   tRNA
C)   hnRNA
D)   rRNA
E)   all of these

Question 12

Which type of molecule is ricin?

Accepted Answer

A)   protein
B)   lipid
C)   nucleic acid
D)   carbohydrate
E)   mineral

Question 13

Which of the following adds RNA nucleotides, one at a time, during transcription?

Accepted Answer

A)   RNA polymerase
B)   DNA polymerase
C)   RNA nuclease
D)   transfer RNA
E)   ribosomal RNA

Question 14

For eukaryotes, translation takes place in the _____.

Accepted Answer

A)   nucleus
B)   nucleolus
C)   cytoplasm
D)   plasma membrane
E)   nucleus and cytoplasm

Question 15

Transcription factors bind to _____.

Accepted Answer

A)   promoters
B)   stop codons
C)   start codons
D)   poly(
A)   tails
E)   introns

Question 16

A ribosome contains _____.

Accepted Answer

A)   RNA only
B)   DNA only
C)   proteins only
D)   RNA and proteins
E)   RNA, DNA, and proteins

Question 17

Ribosome inactivating proteins (RIPs)  inhibit protein synthesis by preventing _____.

Accepted Answer

A)   mRNA from binding to the ribosome
B)   tRNA from binding to the ribosome
C)   the two halves of the ribosome from coming together
D)   the ribosome from moving forward from one codon to the next
E)   the newly synthesized amino acid chain from being released from the ribosome

Question 18

Frameshift mutations may involve _____.

Accepted Answer

A)   the substitution of nucleotides
B)   the substitution of codons
C)   the substitution of amino acids
D)   the insertion of one to several base pairs
E)   mutations in the promoter

Question 19

What is the genetic code?

Accepted Answer

A)   all of our genes collectively
B)   all of our base pairs collectively
C)   the genetic "words" that code for amino acids
D)   the genes in DNA that code for proteins
E)   the genes that encode protein products

Question 20

In eukaryotes, DNA is transcribed in the _____.

Accepted Answer

A)   mitochondria
B)   cytoplasm
C)   ribosomes
D)   nucleus
E)   endoplasmic reticulum

Exam 8: Gene Expression and Control

Amino acids are carried to ribosomes by____ RNA.

Correct AnswerverifiedShow Answer

For eukaryotes, translation takes place in the _____.

Correct AnswerverifiedShow Answer

What is the genetic code?

Correct AnswerverifiedShow Answer

A ribosome contains _____.

Correct AnswerverifiedShow Answer

Which type of molecule is ricin?

Correct AnswerverifiedShow Answer

The activity of the ribosome in translation is analogous to a(n) _____.

Correct AnswerverifiedShow Answer

Which of the following carries amino acids to ribosomes?

Correct AnswerverifiedShow Answer

Which type of mutation results in sickle-cell anemia?

Correct AnswerverifiedShow Answer

Ribosome inactivating proteins (RIPs) inhibit protein synthesis by preventing _____.

Correct AnswerverifiedShow Answer

Ricin exerts its effects on a human cell by _____.

Correct AnswerverifiedShow Answer

How many different codons in our genetic code specify amino acids?

Correct AnswerverifiedShow Answer

Frameshift mutations may involve _____.

Correct AnswerverifiedShow Answer

During transcription, adenine is complementary to _____.

Correct AnswerverifiedShow Answer

How many codons specify the amino acid leucine?

Correct AnswerverifiedShow Answer

Transcription factors bind to _____.

Correct AnswerverifiedShow Answer

Which of the following adds RNA nucleotides, one at a time, during transcription?

Correct AnswerverifiedShow Answer

Epigenetic modifications _____.

Correct AnswerverifiedShow Answer

The tightly condensed nonfunctional X chromosome is called a(n) _____.

Correct AnswerverifiedShow Answer

In eukaryotes, DNA is transcribed in the _____.

Correct AnswerverifiedShow Answer

A Barr body exists for the purpose of _____.

Correct AnswerverifiedShow Answer

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