Question 1

When nucleotides polymerize to form a nucleic acid ________.

Accepted Answer

A)  a covalent bond forms between the sugar of one nucleotide and the phosphate of a second 
B)  a hydrogen bond forms between the sugar of one nucleotide and the phosphate of a second 
C)  covalent bonds form between the bases of two nucleotides 
D)  hydrogen bonds form between the bases of two nucleotides 
A)  a covalent bond forms between the sugar of one nucleotide and the phosphate of a second 
B)  a hydrogen bond forms between the sugar of one nucleotide and the phosphate of a second 
C)  covalent bonds form between the bases of two nucleotides 
D)  hydrogen bonds form between the bases of two nucleotides

Question 2

DNA double helices are soluble in water but insoluble in alcohol. How do these physical properties reflect the chemical structure of the DNA molecule?

Accepted Answer

A)  The charged phosphate groups and sugars of DNA are hydrophilic. 
B)  The purine and pyrimidine bases are hydrophilic. 
C)  The 5 prime to 3 prime polarity of DNA makes it soluble in water but not in alcohol. 
D)  The charged R-groups of DNA are hydrophilic. 
A)  The charged phosphate groups and sugars of DNA are hydrophilic. 
B)  The purine and pyrimidine bases are hydrophilic. 
C)  The 5 prime to 3 prime polarity of DNA makes it soluble in water but not in alcohol. 
D)  The charged R-groups of DNA are hydrophilic.

Question 3

A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of ________.

Accepted Answer

A)  120 adenine and 120 uracil molecules 
B)  120 thymine and 120 adenine molecules 
C)  120 cytosine and 120 thymine molecules 
D)  120 adenine and 120 cytosine molecules 
E)  120 guanine and 120 thymine molecules 
A)  120 adenine and 120 uracil molecules 
B)  120 thymine and 120 adenine molecules 
C)  120 cytosine and 120 thymine molecules 
D)  120 adenine and 120 cytosine molecules 
E)  120 guanine and 120 thymine molecules

Exam 4: Nucleic Acids and the Rna World

When nucleotides polymerize to form a nucleic acid ________.

DNA double helices are soluble in water but insoluble in alcohol. How do these physical properties reflect the chemical structure of the DNA molecule?

A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of ________.

Biology and the Tree of Life

Water and Carbon: the Chemical Basis of Life

Protein Structure and Function

An Introduction to Carbohydrates

Ecosystems and Global Ecology

Lipids, Membranes, and the First Cells

Inside the Cell

Energy and Enzymes: an Introduction to Metabolism

Cellular Respiration and Fermentation

Photosynthesis

Cellcell Interactions

The Cell Cycle

Meiosis

Mendel and the Gene

Dna and the Gene: Synthesis and Repair

How Genes Work

Transcription, Rna Processing, and Translation

Control of Gene Expression in Bacteria

Control of Gene Expression in Eukaryotes

The Molecular Revolution: Biotechnology and Beyond

Genes, Development, and Evolution

Evolution by Natural Selection

Evolutionary Processes

Speciation

Phylogenies and the History of Life

Bacteria and Archaea

Protists

Green Algae and Land Plants

Fungi

An Introduction to Animals

Protostome Animals

Deuterostome Animals

Viruses

Plant Form and Function

Water and Sugar Transport in Plants

Plant Nutrition

Plant Sensory Systems, Signals, and Responses

Plant Reproduction and Development

Animal Form and Function

Water and Electrolyte Balance in Animals

Animal Nutrition

Gas Exchange and Circulation

Animal Nervous Systems

Animal Sensory Systems

Animal Movement

Chemical Signals in Animals

Animal Reproduction and Development

The Immune System in Animals

An Introduction to Ecology

Behavioral Ecology

Population Ecology

Community Ecology

Biodiversity and Conservation Biology

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