Q: Which of the following is a correct representation of a dehydration synthesis reaction?

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

Question 1

Which property of water allows it to moderate Earth's climate by absorbing and releasing large amounts of heat with only slight changes in its own temperature?

Accepted Answer

High heat capacity

Question 2

A molecule of water forms hydrogen bonds primarily due to which property?

Accepted Answer

Its polar covalent bonds

Question 3

Which of the following best describes the difference between a saturated and an unsaturated fatty acid?

Accepted Answer

Saturated fatty acids have only single bonds between carbons; unsaturated have one or more double bonds.

Question 4

Which of the following is a correct representation of a dehydration synthesis reaction?

Accepted Answer

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

Question 5

Which level of protein structure is primarily stabilized by hydrogen bonds between backbone atoms?

Accepted Answer

Secondary structure

Question 6

A mutation causes a single amino acid substitution in the primary structure of a protein. Which levels of protein structure could potentially be affected?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures

Question 7

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose.

Question 8

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonds in ice are more stable and keep molecules further apart.

Question 9

Which of the following is a function of cholesterol in animal cell membranes?

Accepted Answer

It maintains membrane fluidity at various temperatures.

Question 10

Which of the following pairs is correctly matched with the type of bond or interaction that stabilizes it?

Accepted Answer

Base pairs in DNA — hydrogen bonds

Question 11

Which of the following best describes the role of phospholipids in biological membranes?

Accepted Answer

They create a bilayer with hydrophobic tails facing inward and hydrophilic heads facing outward.

Question 12

Which of the following is true regarding the structure of a nucleotide?

Accepted Answer

It contains a phosphate group, a pentose sugar, and a nitrogenous base.

Question 13

Which of the following is a correct application of Chargaff's Rule to a DNA sample with 30% adenine?

Accepted Answer

The sample contains 30% thymine.

Question 14

Which of the following best explains why oil and water do not mix?

Accepted Answer

Oil is nonpolar and water is polar.

Question 15

Which of the following is a correct description of a peptide bond?

Accepted Answer

A covalent bond formed between the amino group of one amino acid and the carboxyl group of another

Question 16

Which of the following is a function of carbohydrates in living organisms?

Accepted Answer

Providing structural support and energy storage

Question 17

Which of the following best describes the difference between alpha and beta glucose?

Accepted Answer

Alpha glucose has the -OH group on carbon 1 below the ring; beta glucose has it above.

Question 18

Which of the following is a correct statement about the denaturation of proteins?

Accepted Answer

Denaturation disrupts secondary, tertiary, and quaternary structures but not primary structure.

Question 19

Which of the following best describes the backbone of a nucleic acid polymer?

Accepted Answer

It is formed by phosphodiester bonds between the phosphate group of one nucleotide and the sugar of the next.

Biochemistry Study Guide: Chemical Context of Life & Macromolecules

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