Question 1

Which of the following events is NOT involved in mRNA processing?

Accepted Answer

A)  the addition of a 5′ "cap" 
B)  the addition of a poly-A tail 
C)  the forming of peptide bonds 
D)  the splicing together of exons 
E)  the removal of introns 
A)  the addition of a 5′ "cap" 
B)  the addition of a poly-A tail 
C)  the forming of peptide bonds 
D)  the splicing together of exons 
E)  the removal of introns

Question 2

DNA replication requires a short strand of _____ as a primer to initiate synthesis.

Accepted Answer

A)  carbohydrates 
B)  amino acids 
C)  phospholipids 
D)  RNA 
E)  magnesium ions 
A)  carbohydrates 
B)  amino acids 
C)  phospholipids 
D)  RNA 
E)  magnesium ions

Question 3

Simple-sequence repeated DNA occurs throughout the genome except at the centromeres and telomeres.

Accepted Answer

A) True 
 B)False

Question 4

A ribosome consists of ______ and ______.

Accepted Answer

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

Question 5

Interspersed repeated DNA units:

Accepted Answer

A)  are arranged in tandem. 
B)  tend to be smaller than 10 base pairs long. 
C)  constitute less than 10 percent of the DNA of most multicellular organisms. 
D)  are identical to one another. 
E)  are believed to have originated from transposons. 
A)  are arranged in tandem. 
B)  tend to be smaller than 10 base pairs long. 
C)  constitute less than 10 percent of the DNA of most multicellular organisms. 
D)  are identical to one another. 
E)  are believed to have originated from transposons.

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

A codon consists of _____ nucleotides in a(n) ____ molecule.

Accepted Answer

A)  two; DNA 
B)  three; DNA 
C)  four; DNA 
D)  three; RNA 
E)  four; RNA 
A)  two; DNA 
B)  three; DNA 
C)  four; DNA 
D)  three; RNA 
E)  four; RNA

Question 8

Which of the following statements concerning transposons is FALSE?

Accepted Answer

A)  They are "molecular parasites." 
B)  They replicate more slowly than other genes. 
C)  They can be inserted into host genes. 
D)  Eukaryotes have epigenetic mechanisms for silencing them. 
E)  They can increase in number from one cell generation to the next. 
A)  They are "molecular parasites." 
B)  They replicate more slowly than other genes. 
C)  They can be inserted into host genes. 
D)  Eukaryotes have epigenetic mechanisms for silencing them. 
E)  They can increase in number from one cell generation to the next.

Question 9

The DNA molecule has the shape of a:

Accepted Answer

A)  single helix. 
B)  double helix 
C)  triple helix. 
D)  step ladder. 
E)  staircase. 
A)  single helix. 
B)  double helix 
C)  triple helix. 
D)  step ladder. 
E)  staircase.

Question 10

The two major categories of repeated DNA are tandemly repeated DNA and interspersed repeated DNA.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following is the best estimate for the percentage of DNA in eukaryotic cells that codes for proteins?

Accepted Answer

A)  less than 1 percent 
B)  less than 10 percent 
C)  about 25 percent 
D)  about 50 percent 
E)  about 75 percent 
A)  less than 1 percent 
B)  less than 10 percent 
C)  about 25 percent 
D)  about 50 percent 
E)  about 75 percent

Question 12

Most eukaryotic structural genes contain introns.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following statements about DNA replication in eukaryotes is FALSE?

Accepted Answer

A)  It is a bidirectional process. 
B)  Helicases break the hydrogen bonds at the origin of replication. 
C)  DNA polymerases catalyze the synthesis of the new strands. 
D)  The two replication forks move in opposite directions away from the origin. 
E)  There is only one origin of replication. 
A)  It is a bidirectional process. 
B)  Helicases break the hydrogen bonds at the origin of replication. 
C)  DNA polymerases catalyze the synthesis of the new strands. 
D)  The two replication forks move in opposite directions away from the origin. 
E)  There is only one origin of replication.

Question 14

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 15

Which of the following events occurs in eukaryotic cells but NOT in prokaryotic cells?

Accepted Answer

A)  RNA polymerase attaches to a particular nucleotide sequence on the DNA. 
B)  RNA is synthesized using the 3′ to 5′ DNA strand as a template. 
C)  Two or more structural genes are transcribed onto a single RNA molecule. 
D)  mRNA transcripts are extensively modified before they leave the nucleus. 
E)  tRNAs, rRNAs, and mRNAs are all involved in the translation process. 
A)  RNA polymerase attaches to a particular nucleotide sequence on the DNA. 
B)  RNA is synthesized using the 3′ to 5′ DNA strand as a template. 
C)  Two or more structural genes are transcribed onto a single RNA molecule. 
D)  mRNA transcripts are extensively modified before they leave the nucleus. 
E)  tRNAs, rRNAs, and mRNAs are all involved in the translation process.

Question 16

Which of the following molecules contains an anticodon?

Accepted Answer

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

Question 17

The "primer" that initiates DNA replication is composed of RNA.

Accepted Answer

A) True 
 B)False

Question 18

In DNA replication, the leading strand is synthesized in fragments, called Okazaki fragments, while the lagging strand is synthesized continuously.

Accepted Answer

A) True 
 B)False

Question 19

RNA contains thymine instead of uracil.

Accepted Answer

A) True 
 B)False

Question 20

In DNA replication, the lagging strand differs from the leading strand in that the lagging strand is synthesized:

Accepted Answer

A)  in a 5′ to 3′ direction. 
B)  in a 3′ to 5′ direction. 
C)  in fragments. 
D)  using DNA polymerase. 
E)  outside the replication bubble. 
A)  in a 5′ to 3′ direction. 
B)  in a 3′ to 5′ direction. 
C)  in fragments. 
D)  using DNA polymerase. 
E)  outside the replication bubble.

Exam 9: The Chemistry of Heredity and Gene Expression

Which of the following events is NOT involved in mRNA processing?

DNA replication requires a short strand of _____ as a primer to initiate synthesis.

Simple-sequence repeated DNA occurs throughout the genome except at the centromeres and telomeres.

A ribosome consists of ______ and ______.

Interspersed repeated DNA units:

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

A codon consists of _____ nucleotides in a(n) ____ molecule.

Which of the following statements concerning transposons is FALSE?

The DNA molecule has the shape of a:

The two major categories of repeated DNA are tandemly repeated DNA and interspersed repeated DNA.

Which of the following is the best estimate for the percentage of DNA in eukaryotic cells that codes for proteins?

Most eukaryotic structural genes contain introns.

Which of the following statements about DNA replication in eukaryotes is FALSE?

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

Which of the following events occurs in eukaryotic cells but NOT in prokaryotic cells?

Which of the following molecules contains an anticodon?

The "primer" that initiates DNA replication is composed of RNA.

In DNA replication, the leading strand is synthesized in fragments, called Okazaki fragments, while the lagging strand is synthesized continuously.

RNA contains thymine instead of uracil.

In DNA replication, the lagging strand differs from the leading strand in that the lagging strand is synthesized:

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

Filters

A ribosome consists of and .

A codon consists of _ nucleotides in a(n) molecule.