Question 1

Which of the following statements best explains why cells are generally small in size?

Accepted Answer

Smaller cells have a higher surface area-to-volume ratio, which facilitates efficient exchange of materials with the environment.

Question 2

Which organelle is directly involved in the synthesis and packaging of proteins for secretion from the cell?

Accepted Answer

Golgi apparatus

Question 3

A red blood cell is placed in distilled water. Predict the movement of water and the likely outcome for the cell.

Accepted Answer

Water will enter the cell by osmosis, causing it to swell and potentially burst.

Question 4

Which of the following structures is found in both prokaryotic and eukaryotic cells?

Accepted Answer

Plasma membrane

Question 5

Which statement best describes the function of the mitochondrion?

Accepted Answer

It produces ATP through cellular respiration, providing energy for cellular processes.

Question 6

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

Accepted Answer

Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy and moves substances against their concentration gradient.

Question 7

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

Accepted Answer

Maintaining cell shape and facilitating movement of organelles

Question 8

Which of the following best describes the role of ATP in energy coupling within cells?

Accepted Answer

ATP hydrolysis releases energy that can be used to drive endergonic reactions.

Question 9

Which of the following statements about membrane fluidity is correct?

Accepted Answer

Unsaturated fatty acids increase membrane fluidity, while cholesterol can either increase or decrease fluidity depending on temperature.

Question 10

Which of the following is true regarding the endomembrane system and the path of a secreted protein?

Accepted Answer

The protein is synthesized by ribosomes on the rough endoplasmic reticulum, transported in vesicles to the Golgi apparatus, and then sent to the plasma membrane for secretion.

Question 11

Which of the following best describes selective permeability of the plasma membrane?

Accepted Answer

The plasma membrane allows some substances to cross more easily than others due to its structure.

Question 12

Which process requires energy input from the cell and moves substances against their concentration gradient?

Accepted Answer

Active transport

Question 13

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of a reaction, increasing the rate without being consumed.

Question 14

A celery cell is placed in salt water. What will happen to the cell?

Accepted Answer

Water will leave the cell, causing it to shrink and become plasmolyzed.

Question 15

Which of the following best describes the difference between catabolic and anabolic pathways?

Accepted Answer

Catabolic pathways break down molecules and release energy; anabolic pathways build molecules and require energy.

Question 16

Which of the following is true about the second law of thermodynamics in biological systems?

Accepted Answer

Every energy transfer increases the entropy (disorder) of the universe.

Question 17

If $$\Delta G$$ for a reaction is negative, what does this indicate about the reaction?

Accepted Answer

The reaction is exergonic and can occur spontaneously.

Question 18

Which of the following would most likely increase the rate of enzyme activity?

Accepted Answer

Increasing temperature to the enzyme's optimal range

Question 19

Which of the following is an example of feedback inhibition in metabolic pathways?

Accepted Answer

The end product of a pathway binds to the enzyme's allosteric site, decreasing its activity.

Question 20

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

Accepted Answer

Specific molecules are imported into the cell after binding to receptors on the plasma membrane.

Cells, Membranes, and Metabolism: Study Guide for General Biology

Guida di studio - Domande di pratica

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