Question 1

Why does DNA synthesis proceed in a 5 ′ to 3 ′ direction?

Accepted Answer

A)  DNA polymerases can only add nucleotides to the 3 ′ end of a polynucleotide strand. 
B)  The 3 ′ end of the polynucleotide molecule contains more phosphates than the 5 ′ end. 
C)  DNA unzips in the 5' to 3' direction. 
D)  DNA strands are parallel to each other. 
E)  Chromosomes are aligned in the 5 ′ to 3 ′ direction in the nucleus. 
A)  DNA polymerases can only add nucleotides to the 3 ′ end of a polynucleotide strand. 
B)  The 3 ′ end of the polynucleotide molecule contains more phosphates than the 5 ′ end. 
C)  DNA unzips in the 5' to 3' direction. 
D)  DNA strands are parallel to each other. 
E)  Chromosomes are aligned in the 5 ′ to 3 ′ direction in the nucleus.

Question 2

The process of DNA replication is conservative . 
__________________

Accepted Answer

A) True 
 B)False

Question 3

In mismatch repair , enzymes remove incorrectly-paired nucleotides. 
__________________

Accepted Answer

A) True 
 B)False

Question 4

The ends of eukaryotic chromosomes can be lengthened by:

Accepted Answer

A)  apoptosis. 
B)  mismatch repair enzymes. 
C)  primase. 
D)  telomerase. 
E)  DNA polymerase. 
A)  apoptosis. 
B)  mismatch repair enzymes. 
C)  primase. 
D)  telomerase. 
E)  DNA polymerase.

Question 5

Unlike normal cells, cancerous cells:

Accepted Answer

A)  have reduced levels of telomerase. 
B)  divide only a few times before succumbing to apoptosis. 
C)  have unusually short telomeres. 
D)  can maintain telomere length as they divide. 
E)  lack telomeres. 
A)  have reduced levels of telomerase. 
B)  divide only a few times before succumbing to apoptosis. 
C)  have unusually short telomeres. 
D)  can maintain telomere length as they divide. 
E)  lack telomeres.

Question 6

Short, noncoding, guanine-rich DNA sequences found at the ends of chromosomes are called telomeres . 
__________________

Accepted Answer

A) True 
 B)False

Question 7

Match between columns
                        Premises: grew bacteria in the presence of heavy nitrogen (15N), followed by growth 14N medium for one or two generations, then measured the density of the DNA
discovered that DNA was responsible for bacterial transformation
demonstrated that DNA is replicated semiconservatively
demonstrated the ratio of nucleotide bases in DNA
discovered that the genetic material in bacteriophages is DNA
used proteins labeled with 35S and DNA labeled with 32P to demonstrate that viral DNA entered bacterial cells, but viral proteins did not
demonstrated that genetic traits can be transferred from one bacterium to another

Accepted Answer

The Answer of Chargaff and Griffith and Hershey and Chase is...

Question 8

Before the 1940s, scientists believed that proteins, rather than DNA, were the carriers of genetic material in the cell. Why?

Accepted Answer

A)  Proteins are present within the nucleus. 
B)  Proteins are abundant within the cell. 
C)  Twenty different amino acids could produce a large number of unique combinations. 
D)  Proteins are able to self replicate. 
E)  Proteins are routinely exported from the cell. 
A)  Proteins are present within the nucleus. 
B)  Proteins are abundant within the cell. 
C)  Twenty different amino acids could produce a large number of unique combinations. 
D)  Proteins are able to self replicate. 
E)  Proteins are routinely exported from the cell.

Exam 12: Dna the Carrier of Genetic Information

Why does DNA synthesis proceed in a 5 ′ to 3 ′ direction?

The process of DNA replication is conservative . __________________

In mismatch repair , enzymes remove incorrectly-paired nucleotides. __________________

The ends of eukaryotic chromosomes can be lengthened by:

Unlike normal cells, cancerous cells:

Short, noncoding, guanine-rich DNA sequences found at the ends of chromosomes are called telomeres . __________________

Before the 1940s, scientists believed that proteins, rather than DNA, were the carriers of genetic material in the cell. Why?

A View of Life

Atoms and Molecules the Chemical Basis of Life

The Chemistry of Life Organic Compounds

Organization of the Cell

Biological Membranes

Cell Communication

Energy and Metabolism

How Cells Make Atp Energy-Releasing Pathways

Photosynthesis Capturing Light Energy

Chromosomes, Mitosis, and Meiosis

The Basic Principles of Heredity

Gene Expression

Gene Regulation

Dna Technology and Genomics

Human Genetics and the Human Genome

Developmental Genetics

Introduction to Darwinian Evolution

Evolutionary Change in Populations

Speciation and Macroevolution

The Origin and Evolutionary History of Life

The Evolution of Primates

Understanding Diversity Systematics

Viruses and Subviral Agents

Bacteria and Archaea

Protists

Seedless Plants

Seed Plants

The Fungi

An Introduction to Animal Diversity

Sponges, Cnidarians, Ctenophores, and Protostomes

The Deuterostomes

Plant Structure Growth and Development

Leaf Structure and Function

Stem Structure and Transport

Roots and Mineral Nutrition

Reproduction in Flowering Plants

Plant Developmental Responses to External and Internal Signals

Animal Structure and Function an Introduction

Protection Support and Movement

Neural Signaling

Neural Regulation

Sensory Systems

Internal Transport

The Immune System Internal Defense

Gas Exchange

Processing Food and Nutrition

Osmoregulation and Disposal of Metabolic Wastes

Endocrine Regulation

Reproduction

Animal Development

Animal Behavior

Introduction to Ecology Population Ecology

Community Ecology

Ecosystems and the Biosphere

Ecology and the Geography of Life

Biological Diversity and Conservation Biology

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