Question 1

Which of the following best explains why small cells have a higher surface area to volume ratio compared to large cells, and why this is advantageous for cellular function?

Accepted Answer

A higher surface area to volume ratio allows for more efficient exchange of materials with the environment.

Question 2

A scientist observes a cell with the following characteristics: DNA in a nucleoid region, no membrane-bound organelles, and a cell wall. Which type of cell is being observed?

Accepted Answer

Prokaryotic cell

Question 3

Which organelle is primarily responsible for synthesizing proteins that are exported from the cell?

Accepted Answer

Rough endoplasmic reticulum

Question 4

A mutation causes a cell to lack functional lysosomes. Which process would be most directly affected?

Accepted Answer

Digestion of macromolecules and autophagy

Question 5

Which of the following statements about the fluid mosaic model of the plasma membrane is correct?

Accepted Answer

The membrane is a dynamic structure with proteins and other molecules embedded in or attached to a fluid lipid bilayer.

Question 6

Which of the following best describes the role of carbohydrates on the cell surface?

Accepted Answer

They serve as identification tags recognized by other cells, aiding in cell-cell recognition.

Question 7

A red blood cell is placed in a hypertonic solution. What will happen to the cell, and why?

Accepted Answer

It will shrink because water leaves the cell.

Question 8

Which equation correctly represents the change in free energy ($$\Delta G) $$for a chemical reaction?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 9

Which of the following best describes the function of ATP in cellular metabolism?

Accepted Answer

ATP stores energy in its high-energy phosphate bonds and releases it through hydrolysis to drive endergonic reactions.

Question 10

A patient is given an oral rehydration solution containing both glucose and sodium. Which transport mechanism allows for the efficient absorption of both substances in the intestine?

Accepted Answer

Secondary active transport (co-transport)

Question 11

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy, speeding up chemical reactions.

Question 12

A cell is exposed to a competitive inhibitor of an enzyme. What is the most likely effect on the enzyme's activity?

Accepted Answer

The inhibitor binds to the active site, blocking substrate binding and decreasing enzyme activity.

Question 13

Which of the following best explains why feedback inhibition is important in metabolic pathways?

Accepted Answer

It prevents the overproduction of the end product by inhibiting an early enzyme in the pathway.

Question 14

During cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$O_2)$$

Question 15

Which of the following equations correctly represents the overall process of cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{ATP}$$

Question 16

Which process produces the most ATP per molecule of glucose during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 17

A muscle cell is deprived of oxygen during intense exercise. Which process allows it to continue producing ATP, and what is the byproduct?

Accepted Answer

Lactic acid fermentation; lactate

Question 18

Which of the following best describes the endosymbiotic theory?

Accepted Answer

Mitochondria and chloroplasts originated as free-living prokaryotes that were engulfed by ancestral eukaryotic cells.

Question 19

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

Accepted Answer

Providing structural support and enabling cell movement

Question 20

A researcher adds a molecule that disrupts the proton gradient across the inner mitochondrial membrane. What is the most immediate effect on cellular respiration?

Accepted Answer

ATP synthesis by oxidative phosphorylation will decrease.

Cell Structure, Membranes, and Energy Conversion: General Biology Study Notes

Guida di studio - Domande di pratica

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