Q: Which equation correctly represents the hydrolysis of ATP in mitochondria?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy}$$

Question 1

Which of the following best describes the structure of a phospholipid in a biological membrane?

Accepted Answer

A molecule with a hydrophilic head (glycerol, phosphate group) and two hydrophobic fatty acid tails

Question 2

Which function is NOT performed by integral (intrinsic) membrane proteins?

Accepted Answer

Storage of genetic material

Question 3

What is the main difference between saturated and unsaturated fatty acids in phospholipids?

Accepted Answer

Unsaturated fatty acids have double bonds, causing kinks in the chain

Question 4

Which organelle is primarily responsible for the synthesis of proteins that are secreted from the cell?

Accepted Answer

Rough endoplasmic reticulum

Question 5

A cell is observed to have an abundance of lysosomes. What is the most likely function of this cell?

Accepted Answer

Degradation of macromolecules and recycling of cellular components

Question 6

Which of the following is a function of the Golgi apparatus?

Accepted Answer

Modification and packaging of proteins for secretion

Question 7

Which equation correctly represents the hydrolysis of ATP in mitochondria?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 8

A mutation causes a cell to lack peroxisomes. Which process would be most affected?

Accepted Answer

Oxidation of fatty acids and detoxification of hydrogen peroxide

Question 9

Which of the following best describes the nucleolus?

Accepted Answer

Site of ribosomal RNA synthesis and ribosome assembly

Question 10

Which cellular structure is responsible for maintaining cell shape and enabling movement of organelles?

Accepted Answer

Cytoskeleton

Question 11

A protein is synthesized in the rough endoplasmic reticulum and then modified by the addition of carbohydrates. Where does this modification most likely occur?

Accepted Answer

Golgi apparatus

Question 12

Which of the following is NOT a function of the plasma membrane?

Accepted Answer

Synthesis of proteins

Question 13

Which process occurs in the mitochondria and is essential for cellular energy production?

Accepted Answer

Oxidative phosphorylation

Question 14

Which of the following statements about ribosomes is correct?

Accepted Answer

Ribosomes synthesize proteins using messenger RNA as a template

Question 15

A cell is observed to have a large number of smooth endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Synthesis of lipids and detoxification of drugs

Question 16

Which of the following best explains why unsaturated fatty acids increase membrane fluidity?

Accepted Answer

Their double bonds create kinks, preventing tight packing

Question 17

Which organelle is responsible for the detoxification of harmful substances and the breakdown of purines?

Accepted Answer

Peroxisome

Question 18

Which of the following is a correct sequence for the pathway of a secreted protein?

Accepted Answer

Rough ER → Golgi apparatus → Vesicle → Plasma membrane

Question 19

Which of the following is a function of the cytoskeleton?

Accepted Answer

Transport of organelles and vesicles within the cell

Question 20

Which of the following best describes the role of cholesterol in the plasma membrane?

Accepted Answer

It stabilizes membrane fluidity by preventing extremes in rigidity and fluidity

Cell Structure and Function: Components, Organelles, and Processes

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