Question 1

Which type of bond is primarily responsible for the cohesion of water molecules, allowing insects to walk on water surfaces?

Accepted Answer

Hydrogen bond

Question 2

A patient is diagnosed with a genetic disorder that affects the structure of their cell membranes. Which of the following molecules is most likely to be directly involved in this defect?

Accepted Answer

Phospholipids

Question 3

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Unsaturated fatty acids have one or more double bonds between carbon atoms, causing kinks in the chain.

Question 4

A scientist is studying a cell and observes the presence of ribosomes, a plasma membrane, and DNA, but no nucleus. Which type of cell is being observed?

Accepted Answer

Prokaryotic cell

Question 5

Which of the following equations correctly represents the formation of a peptide bond during protein synthesis?

Accepted Answer

$$\mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2 \rightarrow \mathrm{Dipeptide} + \mathrm{H}_2\mathrm{O}$$

Question 6

Which of the following best explains why carbohydrates are considered a primary energy source for most organisms?

Accepted Answer

Their bonds can be rapidly broken down to release energy for cellular processes.

Question 7

A mutation causes a cell to lack functional lysosomes. Which of the following consequences is most likely?

Accepted Answer

The cell will accumulate undigested waste products.

Question 8

Which of the following is a correct statement about the structure of a phospholipid?

Accepted Answer

It contains a hydrophilic head and two hydrophobic tails.

Question 9

A person eats a meal high in starch. Which enzyme is primarily responsible for breaking down this carbohydrate in the mouth?

Accepted Answer

Amylase

Question 10

Which of the following best describes the function of the Golgi apparatus in a eukaryotic cell?

Accepted Answer

Modifies, sorts, and packages proteins for secretion

Question 11

Which of the following is the correct general formula for a monosaccharide?

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n}\mathrm{O}_{n}$$

Question 12

A researcher is studying the effect of a toxin that disrupts hydrogen bonding in biological molecules. Which of the following macromolecules would be most directly affected in terms of its secondary structure?

Accepted Answer

Proteins

Question 13

Which of the following scenarios best illustrates the concept of dehydration synthesis?

Accepted Answer

Linking glucose molecules together to form starch, releasing water

Question 14

A cell is observed to have a large central vacuole, a cell wall, and chloroplasts. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 15

Which of the following best explains why unsaturated fats are typically liquid at room temperature?

Accepted Answer

Their fatty acid chains have kinks due to double bonds, preventing tight packing.

Question 16

Which of the following best describes the role of carbohydrates in the structure of the cell membrane?

Accepted Answer

They are attached to proteins and lipids, serving as recognition sites for cell signaling.

Question 17

A student is given a diagram of a cell and asked to identify the organelle responsible for ATP production. Which organelle should the student select?

Accepted Answer

Mitochondrion

Question 18

Which of the following best describes the difference between a monosaccharide and a disaccharide?

Accepted Answer

A disaccharide consists of two monosaccharides joined by a glycosidic bond.

Question 19

Which of the following is a correct representation of the hydrolysis of a disaccharide?

Accepted Answer

$$\mathrm{Disaccharide} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{Monosaccharide}_1 + \mathrm{Monosaccharide}_2$$

Question 20

A patient is found to have a deficiency in the enzyme that breaks down lactose. Which type of macromolecule is directly affected by this deficiency?

Accepted Answer

Carbohydrate

General Biology: Course Introduction and Molecular Foundations

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