Question 1

What is meant by the term antiparallel, when applied to DNA structure?

Accepted Answer

A) The 5' end of one strand is directly paired with the 5' end of the other strand. 
B) The double helix twists; it is not perfectly parallel. 
C) The 5' end of one strand is directly paired with the 3' end of the other strand. 
D) One strand has a negative charge, and the other strand has a positive charge. 
A) The 5' end of one strand is directly paired with the 5' end of the other strand. 
B) The double helix twists; it is not perfectly parallel. 
C) The 5' end of one strand is directly paired with the 3' end of the other strand. 
D) One strand has a negative charge, and the other strand has a positive charge.

Question 2

Reiji Okazaki discovered that "Okazaki fragments" are produced during DNA replication. What are Okazaki fragments?

Accepted Answer

A) short lengths of new DNA on the leading strand 
B) RNA primers on both the lagging and leading strand 
C) RNA primers on the lagging strand 
D) short lengths of new DNA on the lagging strand 
A) short lengths of new DNA on the leading strand 
B) RNA primers on both the lagging and leading strand 
C) RNA primers on the lagging strand 
D) short lengths of new DNA on the lagging strand

Question 3

What adds individual nucleotides to the 3' end of an existing strand to build a new DNA strand during DNA replication?

Accepted Answer

A) topoisomerase 
B) primase 
C) helicase 
D) DNA polymerase 
A) topoisomerase 
B) primase 
C) helicase 
D) DNA polymerase

Question 4

Suppose that a mistake made during DNA replication in a cell is not corrected, but instead the mutation remains in the single strand where it occurred. Then suppose that after the cell divides, both daughter cells survive, and those cells then go on to have DNA replication, and ultimately cell division. Four cells now exist where there once was one cell. Assume that the mistake was never corrected and that no other mistakes occurred. How many of the four cells will have the mutation in their DNA?

Accepted Answer

A) three 
B) two 
C) one 
D) none 
A) three 
B) two 
C) one 
D) none

Question 5

Which process provides the energy needed for DNA replication?

Accepted Answer

A) the breaking of the hydrogen bonds between base pairs 
B) the DNA polymerase 
C) the unwinding of the DNA double helix 
D) the hydrolysis of pyrophosphate 
A) the breaking of the hydrogen bonds between base pairs 
B) the DNA polymerase 
C) the unwinding of the DNA double helix 
D) the hydrolysis of pyrophosphate

Question 6

What does chromatin consist of?

Accepted Answer

A) RNA and protein 
B) DNA and protein 
C) DNA and RNA 
D) DNA only 
A) RNA and protein 
B) DNA and protein 
C) DNA and RNA 
D) DNA only

Question 7

Which enzymes perform proofreading during DNA replication?

Accepted Answer

A) DNA ligase 
B) DNA polymerase 
C) primase 
D) telomerase 
A) DNA ligase 
B) DNA polymerase 
C) primase 
D) telomerase

Question 8

What were the T2 bacteriophages used in the Hershey and Chase experiment made of?

Accepted Answer

A) RNA and protein 
B) DNA and protein 
C) protein, phospholipid, and DNA 
D) DNA 
A) RNA and protein 
B) DNA and protein 
C) protein, phospholipid, and DNA 
D) DNA

Question 9

How do histones bind to DNA?

Accepted Answer

A) by an ionic attraction to the nitrogenous bases of DNA 
B) by hydrogen bonding with the nitrogenous bases of DNA 
C) by hydrogen bonding to the deoxyribose sugars of DNA 
D) by an ionic attraction to the phosphate groups of DNA 
A) by an ionic attraction to the nitrogenous bases of DNA 
B) by hydrogen bonding with the nitrogenous bases of DNA 
C) by hydrogen bonding to the deoxyribose sugars of DNA 
D) by an ionic attraction to the phosphate groups of DNA

Question 10

Which cells in a multicellular organism generally contain inactive telomerases?

Accepted Answer

A) somatic cells 
B) embryonic cells 
C) germ line cells 
D) immune cells 
A) somatic cells 
B) embryonic cells 
C) germ line cells 
D) immune cells

Question 11

What is the length of the DNA contained in the nucleus of a typical human cell?

Accepted Answer

A) about 2 km 
B) about 100 m 
C) about 2 m 
D) about 10 mm 
A) about 2 km 
B) about 100 m 
C) about 2 m 
D) about 10 mm

Question 12

Which of the following acts to remove twisting and strain ahead of the replication fork during DNA replication?

Accepted Answer

A) primase 
B) topoisomerase 
C) helicase 
D) DNA polymerase 
A) primase 
B) topoisomerase 
C) helicase 
D) DNA polymerase

Question 13

Which of the following molecules is a pyrimidine?

Accepted Answer

A) guanine 
B) phosphate 
C) uracil 
D) adenine 
A) guanine 
B) phosphate 
C) uracil 
D) adenine

Question 14

Which structure is formed when histone H1 associates with linker DNA and the nucleosome?
a.euchromatin
b.the 10-nm chromatin fibre
c.heterochromatin
d.the solenoid

Accepted Answer

The answer of Which structure is formed when histone H1...

Exam 12: Dna Structure, Replication, and Organization

What is meant by the term antiparallel, when applied to DNA structure?

Reiji Okazaki discovered that "Okazaki fragments" are produced during DNA replication. What are Okazaki fragments?

What adds individual nucleotides to the 3' end of an existing strand to build a new DNA strand during DNA replication?

Which process provides the energy needed for DNA replication?

What does chromatin consist of?

Which enzymes perform proofreading during DNA replication?

What were the T2 bacteriophages used in the Hershey and Chase experiment made of?

How do histones bind to DNA?

Which cells in a multicellular organism generally contain inactive telomerases?

What is the length of the DNA contained in the nucleus of a typical human cell?

Which of the following acts to remove twisting and strain ahead of the replication fork during DNA replication?

Which of the following molecules is a pyrimidine?

Which structure is formed when histone H1 associates with linker DNA and the nucleosome? a.euchromatin b.the 10-nm chromatin fibre c.heterochromatin d.the solenoid

Light and Life

The Cell: an Overview

Defining Life and Its Origins

Energy and Enzymes

Cell Membranes and Signalling

Cellular Respiration

Photosynthesis

Cell Cycles

Genetic Recombination

Mendel, Genes, and Inheritance

Genes, Chromosomes, and Human Genetics

Gene Structure and Expression

Control of Gene Expression

Dna Technologies

Genomes and Proteomes

Evolution: the Development of the Theory

Microevolution: Changes Within Populations

Species and Macroevolution

Understanding the History of Life on Earth

Humans and Evolution

Bacteria and Archaea

Viruses, Viroids, and Prions: Infectious Biological Particles

Protists

Fungi

Plants

Diversity of Animals 1: Sponges, Radiata, Platyhelminthes, and Protostomes

Diversity of Animals 2: Deuterostomes: Vertebrates and Their Closest Relatives

Population Ecology

Population Interactions and Community Ecology

Ecosystems

Conservation of Biodiversity

Putting Selection to Work

Organization of the Plant Body

Transport in Plants

Reproduction and Development in Flowering Plants

Plant Nutrition

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Transport in Animals: the Circulatory System

Reproduction in Animals

Animal Development

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Integration

Muscles, Skeletons, and Body Movements

Animal Behaviour

Animal Nutrition

Gas Exchange: the Respiratory System

Regulating the Internal Environment

Defences Against Disease

Conservation and Evolutionary Physiology

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