Question 1

Which of the following best describes the process of osmosis in a living cell?

Accepted Answer

The movement of water molecules from an area of lower solute concentration to an area of higher solute concentration across a selectively permeable membrane.

Question 2

A scientist is studying a protein that helps move glucose across the cell membrane without using energy. Which type of transport is this protein most likely involved in?

Accepted Answer

Facilitated diffusion

Question 3

Which of the following best explains why a red blood cell placed in a hypotonic solution will swell?

Accepted Answer

Water moves into the cell because the solution outside has a lower solute concentration than inside the cell.

Question 4

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

Accepted Answer

$$C_6H_{12}O_6$ + C_6H_{12}O_6$ \rightarrow C$$_{12}$$H_{22}O$$_{11} + H_2O$

Question 5

Which property of water allows insects to walk on its surface?

Accepted Answer

Surface tension due to cohesion between water molecules

Question 6

A mutation causes a protein to lose its tertiary structure. Which level of protein structure is most directly affected?

Accepted Answer

The overall three-dimensional shape of the polypeptide chain

Question 7

Which of the following molecules is amphipathic and forms the main component of cell membranes?

Accepted Answer

Phospholipid

Question 8

A patient is diagnosed with hyponatremia, a condition where sodium levels in the blood are abnormally low. Which membrane protein is most likely malfunctioning?

Accepted Answer

Sodium-potassium pump

Question 9

Which of the following best describes the difference between a covalent bond and an ionic bond?

Accepted Answer

A covalent bond involves sharing electrons, while an ionic bond involves the transfer of electrons.

Question 10

Which of the following is a correct example of a polymer and its monomer?

Accepted Answer

Starch (polymer) and glucose (monomer)

Question 11

Which of the following best explains why water is considered a universal solvent?

Accepted Answer

Its polarity allows it to dissolve many ionic and polar substances.

Question 12

A cell is placed in an isotonic solution. What will happen to the cell?

Accepted Answer

There will be no net movement of water into or out of the cell.

Question 13

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

They lower the activation energy required for reactions to occur.

Question 14

Which of the following is a correct formula for the hydrolysis of a disaccharide?

Accepted Answer

$$C_{12}H$$_{22}$$O_{11} + H_2O \rightarrow 2C_6H_{12}O_6$

Question 15

Which of the following best describes the primary structure of a protein?

Accepted Answer

The unique linear sequence of amino acids in a polypeptide

Question 16

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

It moves molecules down their concentration gradient without using cellular energy.

Question 17

Which of the following is a correct example of a hydrogen bond in biological systems?

Accepted Answer

The attraction between the hydrogen atom of one water molecule and the oxygen atom of another water molecule.

Question 18

A cell membrane is described as selectively permeable. Which of the following best explains this property?

Accepted Answer

It allows some substances to pass through while blocking others.

Question 19

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

Accepted Answer

A saturated fatty acid has no double bonds between carbon atoms, while an unsaturated fatty acid has one or more double bonds.

Essential Concepts and Terminology in General Biology

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