Question 1

Which property of water is primarily responsible for its ability to moderate temperature in living organisms?

Accepted Answer

High specific heat due to extensive hydrogen bonding

Question 2

A protein loses its three-dimensional structure when exposed to extreme heat. What is the term for this process, and what is the consequence for the protein's function?

Accepted Answer

Denaturation; the protein loses its function

Question 3

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

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds stabilize a more open structure

Question 4

Which functional group is most likely to act as an acid in organic molecules?

Accepted Answer

Carboxyl group ($$-\mathrm{COOH})$$

Question 5

Which statement about protein secondary structure is correct?

Accepted Answer

It is stabilized by hydrogen bonds between backbone atoms

Question 6

A chemical reaction is considered spontaneous if:

Accepted Answer

It proceeds without any continuous external influence

Question 7

Which of the following is a correct representation of a chemical reaction equation?

Accepted Answer

$$\mathrm{Reactant}(s) \rightarrow \mathrm{Product}(s)$$

Question 8

Which of the following best describes the role of enzymes in metabolic pathways?

Accepted Answer

Each step in a pathway is catalyzed by a specific enzyme

Question 9

Which of the following statements about DNA structure is correct?

Accepted Answer

DNA strands are antiparallel and held together by hydrogen bonds between base pairs

Question 10

Which property of lipids allows them to form selectively permeable membranes?

Accepted Answer

Lipids are amphipathic, containing both hydrophobic and hydrophilic regions

Question 11

Which of the following is a correct description of a condensation reaction?

Accepted Answer

It joins monomers to form polymers, releasing water

Question 12

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 13

Which of the following best explains why hydrophobic molecules do not dissolve in water?

Accepted Answer

They are uncharged and nonpolar, so they cannot interact with water's polarity

Question 14

Which of the following is true about monosaccharides?

Accepted Answer

They are the simplest carbohydrates and serve as energy sources

Question 15

Which of the following statements about chemical equilibrium is correct?

Accepted Answer

Equilibrium is a state where the reaction occurs in both directions at approximately the same rate

Question 16

Which of the following is a correct statement about the second law of thermodynamics?

Accepted Answer

Entropy always increases in chemical reactions

Question 17

Which of the following is a correct example of a transport protein and its function?

Accepted Answer

Hemoglobin; transports oxygen from the lungs to other parts of the body

Question 18

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

Accepted Answer

RNA contains uracil and DNA contains thymine

Question 19

Which of the following is true about the formation of glycosidic linkages in carbohydrates?

Accepted Answer

Glycosidic linkages form between any two hydroxyl groups of monosaccharides

Question 20

Which of the following best explains why carbon is the backbone of organic molecules?

Accepted Answer

Carbon can form four covalent bonds, allowing for a variety of molecular shapes

General Biology Study Notes: Water, Chemical Reactions, Macromolecules, and Proteins

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