Question 1

According to cell theory, which statement is correct regarding the origin of cells in multicellular organisms?

Accepted Answer

Cells in multicellular organisms originate from pre-existing cells and their products.

Question 2

Which of the following cell types is primarily responsible for gathering information and controlling body functions?

Accepted Answer

Nerve cells

Question 3

A cell's size is limited by its surface area-to-volume ratio. If a cell's diameter doubles, how does its surface area-to-volume ratio change?

Accepted Answer

It decreases.

Question 4

Which organelle is most abundant in cells that require large amounts of energy, such as muscle cells?

Accepted Answer

Mitochondria

Question 5

The plasma membrane is described by the fluid mosaic model. Which feature best explains this model?

Accepted Answer

Proteins and lipids can move laterally within the bilayer, allowing dynamic changes.

Question 6

Which of the following is a function of membrane-bound receptors on the plasma membrane?

Accepted Answer

Binding to polar ligands and initiating a cascade of intracellular events.

Question 7

Microvilli are specialized extensions of the plasma membrane. What is their primary function?

Accepted Answer

To increase the surface area for absorption.

Question 8

Which type of membrane transport does NOT require energy expenditure by the cell?

Accepted Answer

Facilitated diffusion

Question 9

A red blood cell is placed in a solution containing 20% NaCl. What will happen to the cell?

Accepted Answer

It will shrink and undergo crenation.

Question 10

Which equation correctly represents aerobic cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + 36ATP$$

Question 11

During facilitated diffusion, what limits the rate at which solutes can be transported across the membrane?

Accepted Answer

The number of available carrier proteins.

Question 12

Which process describes the movement of water across a selectively permeable membrane from an area of low solute concentration to high solute concentration?

Accepted Answer

Osmosis

Question 13

Which of the following statements about enzymes is TRUE?

Accepted Answer

Enzymes lower the activation energy and speed up reactions.

Question 14

Which step of cellular respiration occurs in the cytoplasm?

Accepted Answer

Glycolysis

Question 15

If oxygen is not present during cellular respiration, which product is formed from glucose?

Accepted Answer

2 ATP and lactic acid

Question 16

Which of the following best describes secondary active transport?

Accepted Answer

It relies on the energy stored in the concentration gradient of one molecule to transport another molecule.

Question 17

Which of the following is the correct sequence of events in aerobic respiration?

Accepted Answer

Glycolysis → Acetyl CoA formation → Citric Acid Cycle → Electron Transport Chain

Question 18

Which nutrient is typically used first by the body to power cellular respiration?

Accepted Answer

Carbohydrates

Question 19

What is the main function of ATP produced in mitochondria?

Accepted Answer

To provide energy for cellular work.

Question 20

Which of the following best explains why enzymes are essential for life?

Accepted Answer

They allow reactions to occur at a rate compatible with life by lowering activation energy.

Cell Structure, Membrane Function, and Energy Production: Chapter 3 Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard