Question 1

Which of the following best describes a dehydration reaction in the synthesis of biological polymers?

Accepted Answer

A reaction in which a water molecule is removed, forming a new covalent bond between monomers.

Question 2

A patient is diagnosed with a genetic disorder that prevents the formation of glycosidic linkages. Which class of macromolecules would be most directly affected?

Accepted Answer

Carbohydrates

Question 3

Which of the following statements about saturated and unsaturated fatty acids is correct?

Accepted Answer

Saturated fatty acids contain only single bonds between carbon atoms, making them solid at room temperature.

Question 4

Which bond is formed between the glycerol backbone and fatty acids in a triglyceride molecule?

Accepted Answer

Ester linkage

Question 5

A scientist observes a cell with a prominent nucleolus, extensive rough endoplasmic reticulum, and many mitochondria. Which of the following is most likely true about this cell?

Accepted Answer

It is a eukaryotic cell specialized for protein synthesis and energy production.

Question 6

Which of the following best explains why phospholipids spontaneously form bilayers in aqueous environments?

Accepted Answer

Their amphipathic nature, with hydrophilic heads and hydrophobic tails, drives self-assembly.

Question 7

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Modifying, sorting, and packaging proteins for secretion or delivery to other organelles

Question 8

A red blood cell is placed in a hypertonic solution. What is the most likely outcome?

Accepted Answer

The cell will shrink (crenate) as water leaves the cell.

Question 9

Which of the following best describes the difference between facilitated diffusion and active transport across a plasma membrane?

Accepted Answer

Facilitated diffusion moves substances down their concentration gradient without energy input, while active transport moves substances against their gradient using energy.

Question 10

Which of the following organelles is primarily responsible for the breakdown of hydrogen peroxide ($$2H_2O_2 \rightarrow 2H_2O + O_2$) in animal cells?

Accepted Answer

Peroxisome

Question 11

Which of the following statements about the extracellular matrix (ECM) in animal cells is correct?

Accepted Answer

The ECM is a network of proteins and carbohydrates that provides structural support and mediates cell signaling.

Question 12

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

Accepted Answer

The sequence of amino acids joined by peptide bonds.

Question 13

Which of the following is a correct description of a phosphodiester linkage?

Accepted Answer

A bond between the phosphate group of one nucleotide and the sugar of another nucleotide in nucleic acids.

Question 14

A mutation prevents the formation of tight junctions in intestinal epithelial cells. Which of the following is a likely consequence?

Accepted Answer

Uncontrolled passage of substances between adjacent cells.

Question 15

Which of the following best explains the role of cholesterol in the plasma membrane of animal cells?

Accepted Answer

Cholesterol buffers membrane fluidity, preventing it from becoming too rigid or too fluid across temperature changes.

Question 16

Which of the following is a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Providing structural support, facilitating cell movement, and transporting organelles.

Question 17

Which of the following molecules can most easily diffuse directly through the plasma membrane without the help of transport proteins?

Accepted Answer

Small nonpolar molecules such as $$O_2$$ and $$CO_2$$

Question 18

Which of the following best describes the process of receptor-mediated endocytosis?

Accepted Answer

The cell takes in specific molecules by the inward budding of vesicles containing receptor proteins.

Question 19

Which of the following best distinguishes between a polypeptide and a protein?

Accepted Answer

A protein is one or more polypeptides folded into a specific three-dimensional structure, while a polypeptide is a linear chain of amino acids.

Question 20

Which of the following is a correct description of osmosis?

Accepted Answer

The movement of water from an area of low solute concentration to an area of high solute concentration across a selectively permeable membrane.

Biology Study Guide: Macromolecules, Cell Structure, and Membrane Function

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