Question 1

Which of the following events is NOT part of the initiation stage of translation?

Accepted Answer

A) The smaller ribosomal subunit attaches to mRNA. 
B) GTP is hydrolyzed. 
C) The larger ribosomal subunit attaches to the smaller subunit. 
D) fMet-tRNA binds at the P site. 
E) The initiator tRNA is released from the E site. 
A) The smaller ribosomal subunit attaches to mRNA. 
B) GTP is hydrolyzed. 
C) The larger ribosomal subunit attaches to the smaller subunit. 
D) fMet-tRNA binds at the P site. 
E) The initiator tRNA is released from the E site. E

Question 2

An example of a noncoding RNA is tRNA.

Accepted Answer

A) True 
 B)False  False

Question 3

Epigenetic inheritance refers to the inheritance of traits encoded by genes in the telomeres.

Accepted Answer

A) True 
 B)False  False

Question 4

Peptide bond formation on the ribosome is catalyzed by RNA.

Accepted Answer

A) True 
 B)False

Question 5

The function of aminoacyl-tRNA synthetase is to catalyze the synthesis of tRNA.

Accepted Answer

A) True 
 B)False

Question 6

The role of ______ is to carry amino acids to the ribosomes.

Accepted Answer

A) DNA 
B) mRNA 
C) tRNA 
D) rRNA 
E) protein 
A) DNA 
B) mRNA 
C) tRNA 
D) rRNA 
E) protein

Question 7

Which of the following statements concerning noncoding RNAs is FALSE?

Accepted Answer

A) They are types of tRNA molecules. 
B) They are present in most eukaryotic genomes. 
C) Some are responsible for striking developmental abnormalities. 
D) An example is microRNA. 
E) Some are responsible for RNA interference. 
A) They are types of tRNA molecules. 
B) They are present in most eukaryotic genomes. 
C) Some are responsible for striking developmental abnormalities. 
D) An example is microRNA. 
E) Some are responsible for RNA interference.

Question 8

A transfer RNA molecule carries a(n) ______ to the ribosomes.

Accepted Answer

A) amino acid 
B) protein 
C) mRNA molecule 
D) ATP molecule 
E) segment of DNA nucleotides 
A) amino acid 
B) protein 
C) mRNA molecule 
D) ATP molecule 
E) segment of DNA nucleotides

Question 9

Each strand in a DNA molecule:

Accepted Answer

A) is bonded to two other strands. 
B) has a 5′ end and a 3′ end. 
C) has two 5′ ends. 
D) has two 3′ ends. 
E) is parallel to the other strand(s) but not antiparallel. 
A) is bonded to two other strands. 
B) has a 5′ end and a 3′ end. 
C) has two 5′ ends. 
D) has two 3′ ends. 
E) is parallel to the other strand(s) but not antiparallel.

Question 10

Before transcription is completed, a poly-A tail is added to the 3′ end of the mRNA.

Accepted Answer

A) True 
 B)False

Question 11

RNA contains thymine instead of uracil.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is the most likely next step after histones are acetylated?

Accepted Answer

A) DNA binds histones. 
B) Translation is inhibited. 
C) Translation occurs. 
D) Transcription is inhibited. 
E) Transcription occurs. 
A) DNA binds histones. 
B) Translation is inhibited. 
C) Translation occurs. 
D) Transcription is inhibited. 
E) Transcription occurs.

Question 13

During the elongation stage of translation:

Accepted Answer

A) the two ribosomal subunits separate. 
B) a polysome forms. 
C) release factors bind at the A site. 
D) fMet-tRNA binds to the initiation codon. 
E) a peptide bond is formed. 
A) the two ribosomal subunits separate. 
B) a polysome forms. 
C) release factors bind at the A site. 
D) fMet-tRNA binds to the initiation codon. 
E) a peptide bond is formed.

Question 14

In the ladder molecule of a DNA molecule, the purine and pyrimidine bases comprise the sides of the ladder.

Accepted Answer

A) True 
 B)False

Question 15

When DNA is methylated:

Accepted Answer

A) transcription is repressed. 
B) transcription is stimulated. 
C) histone tails bind DNA. 
D) histone tails are released from DNA. 
E) histones are acetylated. 
A) transcription is repressed. 
B) transcription is stimulated. 
C) histone tails bind DNA. 
D) histone tails are released from DNA. 
E) histones are acetylated.

Question 16

The 5′ cap of mRNA serves to bind the mRNA molecule to the ribosome.

Accepted Answer

A) True 
 B)False

Question 17

Exons are noncoding sequences of nucleotides that are present in genes.

Accepted Answer

A) True 
 B)False

Question 18

The incoming amino-acid-bearing tRNA binds at the A site.

Accepted Answer

A) True 
 B)False

Question 19

After a DNA molecule "unzips," the two strands are kept separated by:

Accepted Answer

A) single-strand binding proteins. 
B) DNA polymerase. 
C) DNA ligase. 
D) helicases. 
E) telomerase. 
A) single-strand binding proteins. 
B) DNA polymerase. 
C) DNA ligase. 
D) helicases. 
E) telomerase.

Question 20

DNA polymerase synthesizes new DNA strands only in the 5′ to 3′ direction.

Accepted Answer

A) True 
 B)False

Exam 9: The Chemistry of Heredity and Gene Expression

Which of the following events is NOT part of the initiation stage of translation?

An example of a noncoding RNA is tRNA.

Epigenetic inheritance refers to the inheritance of traits encoded by genes in the telomeres.

Peptide bond formation on the ribosome is catalyzed by RNA.

The function of aminoacyl-tRNA synthetase is to catalyze the synthesis of tRNA.

The role of ______ is to carry amino acids to the ribosomes.

Which of the following statements concerning noncoding RNAs is FALSE?

A transfer RNA molecule carries a(n) ______ to the ribosomes.

Each strand in a DNA molecule:

Before transcription is completed, a poly-A tail is added to the 3′ end of the mRNA.

RNA contains thymine instead of uracil.

Which of the following is the most likely next step after histones are acetylated?

During the elongation stage of translation:

In the ladder molecule of a DNA molecule, the purine and pyrimidine bases comprise the sides of the ladder.

When DNA is methylated:

The 5′ cap of mRNA serves to bind the mRNA molecule to the ribosome.

Exons are noncoding sequences of nucleotides that are present in genes.

The incoming amino-acid-bearing tRNA binds at the A site.

After a DNA molecule "unzips," the two strands are kept separated by:

DNA polymerase synthesizes new DNA strands only in the 5′ to 3′ direction.

Botany: an Introduction

The Molecular Composition of Plant Cells

The Plant Cell and the Cell Cycle

The Movement of Substances Into and Out of Cells

The Flow of Energy

Respiration

Photosynthesis, Light, and Life

Sexual Reproduction and Heredity

Recombinant Dna Technology, Plant Biotechnology, and Genomics

The Process of Evolution

Systematics: the Science of Biological Diversity

Prokaryotes and Viruses

Fungi

Protists: Algae and Heterotrophic Protists

Bryophytes

Seedless Vascular Plants

Gymnosperms

Introduction to the Angiosperms

Evolution of the Angiosperms

Plants and People

Early Development of the Plant Body

Cells and Tissues of the Plant Body

The Root: Structure and Development

The Shoot: Primary Structure and Development

Secondary Growth in Stems

Regulating Growth and Development: the Plant Hormones

External Factors and Plant Growth

Plant Nutrition and Soils

The Movement of Water and Solutes in Plants

The Dynamics of Communities and Ecosystems

Global Ecology

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