Q: A dehydration reaction is crucial in the formation of biological polymers. Which equation correctly represents this process?

$\text{Monomer}_1 + \text{Monomer}_2 \rightarrow \text{Polymer} + H_2O$

Q: Which of the following best describes the process of hydrolysis?

Breaking a polymer into monomers by adding water: $\text{Polymer} + H_2O \rightarrow \text{Monomer}_1 + \text{Monomer}_2$

Question 1

Which of the following best explains why carbon is considered the backbone of life’s molecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a diversity of stable structures.

Question 2

A dehydration reaction is crucial in the formation of biological polymers. Which equation correctly represents this process?

Accepted Answer

$	ext{Monomer}_1 + 	ext{Monomer}_2 ightarrow 	ext{Polymer} + H_2O$

Question 3

Which of the following statements about lactose intolerance is supported by genetic evidence?

Accepted Answer

A single nucleotide change outside the lactase gene can determine lactose intolerance.

Question 4

Which of the following best describes the difference between glucose and fructose?

Accepted Answer

They are isomers with the same molecular formula $C_6H_{12}O_6$ but different structural arrangements.

Question 5

Which of the following is NOT a function of fats in the human body?

Accepted Answer

Catalyzing chemical reactions

Question 6

A triglyceride is formed by joining which of the following components?

Accepted Answer

One glycerol and three fatty acids

Question 7

Which of the following best explains why cellulose cannot be digested by humans?

Accepted Answer

Humans lack the enzyme to break the specific bonds in cellulose.

Question 8

Which of the following is a correct complementary DNA strand for the sequence 5'-GAATGC-3'?

Accepted Answer

5'-GCATTC-3'

Question 9

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose and thymine, while RNA contains ribose and uracil.

Question 10

Which of the following is a real-world consequence of a single amino acid substitution in a protein?

Accepted Answer

Sickle-cell disease, due to a change in hemoglobin structure

Question 11

Which of the following best explains why trans fats are considered unhealthy?

Accepted Answer

They are produced during hydrogenation and increase the risk of heart disease.

Question 12

Which of the following is NOT a component of a nucleotide?

Accepted Answer

A fatty acid

Question 13

Which of the following best describes the process of hydrolysis?

Accepted Answer

Breaking a polymer into monomers by adding water: $	ext{Polymer} + H_2O ightarrow 	ext{Monomer}_1 + 	ext{Monomer}_2$

Question 14

Which of the following is a major theme illustrated by the fact that both starch and cellulose are made of glucose monomers but only starch is digestible by humans?

Accepted Answer

The relationship of structure to function

Question 15

Which of the following is NOT made of protein?

Accepted Answer

Cellulose

Question 16

Which of the following best explains why lipids are hydrophobic?

Accepted Answer

They consist mostly of nonpolar hydrocarbon chains.

Question 17

Which of the following is a function of cholesterol in animal cells?

Accepted Answer

It is a key component of cell membranes.

Question 18

Which of the following best describes the role of genes in protein synthesis?

Accepted Answer

Genes encode the sequence of amino acids in a polypeptide.

Question 19

Which of the following best explains the evolutionary connection between lactose tolerance and dairy farming in certain human populations?

Accepted Answer

Natural selection favored mutations that kept the lactase gene active in populations that relied on dairy products.

The Molecules of Life: Structure, Function, and Diversity of Biological Macromolecules

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