Question 1

Which of the following best describes a property of life that distinguishes living organisms from non-living matter?

Accepted Answer

Organization into cells and the ability to reproduce

Question 2

A scientist is testing the effect of light on plant growth by forming a hypothesis, conducting experiments, and analyzing results. Which scientific method step is the scientist performing when they form a hypothesis?

Accepted Answer

Proposing an explanation based on prior knowledge

Question 3

Which of the following is an example of a hydrogen bond?

Accepted Answer

The attraction between water molecules ($$H_2O) $$due to partial charges

Question 4

Which statement correctly compares ionic and covalent bonds?

Accepted Answer

Ionic bonds involve transferring electrons, while covalent bonds involve sharing electrons.

Question 5

Which of the following best explains why water has a high specific heat?

Accepted Answer

Hydrogen bonds between water molecules require more energy to break.

Question 6

A protein's tertiary structure is primarily stabilized by which of the following interactions?

Accepted Answer

Interactions among side chains (R groups) of amino acids

Question 7

Hemoglobin's quaternary structure is essential for its function because:

Accepted Answer

It enables the association of multiple polypeptide chains for oxygen transport.

Question 8

Which of the following best describes the difference between monosaccharides and polysaccharides?

Accepted Answer

Monosaccharides are simple sugars, while polysaccharides are long chains of sugars linked together.

Question 9

Glycogen is highly branched. What is the functional significance of this structure in animals?

Accepted Answer

It allows for rapid release of glucose when energy is needed.

Question 10

Which of the following is a major difference between saturated and unsaturated fatty acids?

Accepted Answer

Unsaturated fatty acids have one or more double bonds; saturated fatty acids have none.

Question 11

A cell membrane is described as a phospholipid bilayer. What property of phospholipids allows them to form this structure spontaneously in water?

Accepted Answer

Phospholipids have both hydrophilic heads and hydrophobic tails.

Question 12

Which of the following molecules can most easily cross a cell membrane by simple diffusion?

Accepted Answer

Small nonpolar molecules like $$O_2$$ and $$CO_2$$

Question 13

Which transport mechanism requires energy input in the form of ATP?

Accepted Answer

Active transport

Question 14

The sodium-potassium pump moves ions against their concentration gradients. Which equation best represents the stoichiometry of this pump?

Accepted Answer

$$ATP + 3Na^+_{in} + 2K^+_{out} \rightarrow ADP + P_i + 3Na^+_{out} + 2K^+_{in}$$

Question 15

A patient is given an intravenous solution that is hypotonic relative to their blood plasma. What will most likely happen to their red blood cells?

Accepted Answer

The cells will swell and may burst due to water entering by osmosis.

Question 16

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient through a protein channel, without energy input

Question 17

Which of the following scenarios best illustrates the importance of protein denaturation in living organisms?

Accepted Answer

A protein unfolds at high temperature, losing its function as an enzyme.

Question 18

Which of the following is a correct match between a macromolecule and its monomer?

Accepted Answer

Carbohydrate – Monosaccharide

Question 19

A mutation changes a hydrophilic amino acid in a protein to a hydrophobic one. Which of the following is a likely consequence for the protein's structure?

Accepted Answer

The protein may misfold due to altered interactions with water and other side chains.

Question 20

Which of the following best explains why phospholipids are essential for cell membrane structure?

Accepted Answer

Their amphipathic nature allows them to form bilayers with hydrophilic heads facing water and hydrophobic tails facing inward.

General Biology: Foundations, Biomolecules, and Membrane Transport

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