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 wants to test the effect of light on plant growth by forming a hypothesis and conducting experiments. Which property of scientific investigation is the scientist demonstrating?

Accepted Answer

Hypothesis formation and experimentation

Question 3

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

Accepted Answer

The attraction between a hydrogen atom in water and an oxygen atom in another water molecule

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

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

Accepted Answer

Ionic, hydrogen, and disulfide bonds among side chains

Question 6

Which level of protein structure is directly affected when a protein is denatured by heat?

Accepted Answer

Secondary, tertiary, and quaternary structures

Question 7

Which of the following best explains why hemoglobin is able to efficiently transport oxygen in the blood?

Accepted Answer

Its quaternary structure allows cooperative binding of oxygen molecules.

Question 8

Which of the following is a correct statement about polysaccharides?

Accepted Answer

They are long chains of monosaccharides linked by glycosidic bonds.

Question 9

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

Accepted Answer

It allows rapid release of glucose when energy is needed.

Question 10

Which of the following statements about lipids is correct?

Accepted Answer

Phospholipids are major components of cell membranes due to their amphipathic nature.

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

They have both hydrophilic heads and hydrophobic tails.

Question 12

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

Accepted Answer

Small nonpolar molecules like $$\mathrm{O_2$}$$ and $$\mathrm{CO_2$}$$

Question 13

Which of the following best describes the difference between passive and active transport across cell membranes?

Accepted Answer

Active transport moves substances against their concentration gradient using energy, while passive transport moves substances down their gradient without energy input.

Question 14

A red blood cell is placed in a hypotonic solution. What will happen to the cell, and which process is responsible?

Accepted Answer

The cell will swell and possibly burst due to osmosis.

Question 15

The sodium-potassium pump is an example of which type of membrane transport, and what is its key function?

Accepted Answer

Active transport; maintains ion gradients by moving $$3\ \mathrm{Na^+}$$ out and $$2\ \mathrm{K^+} in $$using ATP

Question 16

Which equation correctly represents the action of the sodium-potassium pump?

Accepted Answer

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

Question 17

A patient is diagnosed with a genetic disorder that affects the structure of their hemoglobin, causing sickle cell anemia. Which level of protein structure is most directly altered by this mutation?

Accepted Answer

Primary structure

Question 18

Which of the following best explains why water is an excellent solvent for many biological molecules?

Accepted Answer

Water is polar and forms hydrogen bonds with polar and charged molecules.

Question 19

Which of the following scenarios best illustrates the function of enzymes as proteins in living organisms?

Accepted Answer

A protein catalyzing the breakdown of hydrogen peroxide into water and oxygen

Question 20

A researcher observes that a certain carbohydrate is composed of only glucose monomers and is highly branched. Which carbohydrate is the researcher most likely studying?

Accepted Answer

Glycogen

General Biology: Foundations, Biomolecules, and Membrane Transport

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