Q: Which equation best describes the movement of free water molecules during osmosis across a selectively permeable membrane?

$$\text{Free water moves from HIGH} \rightarrow \text{LOW free water concentration}$$

Question 1

Which organelle is primarily responsible for modifying, sorting, and packaging proteins for secretion in eukaryotic cells?

Accepted Answer

Golgi apparatus

Question 2

A cell is observed to have a deficiency in digesting macromolecules and recycling damaged organelles. Which organelle is most likely malfunctioning?

Accepted Answer

Lysosome

Question 3

Which process involves a cell engulfing large particles or other cells, forming a food vacuole that later fuses with a lysosome for digestion?

Accepted Answer

Phagocytosis

Question 4

In neurons, neurotransmitters are released into the synaptic cleft when an action potential arrives. Which cellular structures are responsible for storing and transporting these neurotransmitters?

Accepted Answer

Transport vesicles

Question 5

Which cytoskeletal component is primarily responsible for the movement of cilia and flagella?

Accepted Answer

Microtubules

Question 6

The endosymbiont theory explains the origin of which two organelles in eukaryotic cells?

Accepted Answer

Mitochondria and chloroplasts

Question 7

A cell maintains a higher concentration of sodium ions outside than inside. What property of the plasma membrane allows this gradient to be maintained?

Accepted Answer

Selective permeability

Question 8

Which type of membrane transport requires energy and moves molecules against their concentration gradient?

Accepted Answer

Active transport

Question 9

Which equation best describes the movement of free water molecules during osmosis across a selectively permeable membrane?

Accepted Answer

$$	ext{Free water moves from HIGH} ightarrow 	ext{LOW free water concentration}$$

Question 10

Which of the following molecules can pass most easily through the phospholipid bilayer of the plasma membrane?

Accepted Answer

Oxygen ($$O_2)$$

Question 11

Integral membrane proteins must be amphipathic because:

Accepted Answer

They need to interact with both hydrophobic and hydrophilic regions of the membrane

Question 12

Which type of membrane protein is most likely to function as a channel for ions to pass through the membrane?

Accepted Answer

Integral protein

Question 13

A carrier protein changes shape when a phosphate group is attached to it. This phosphate group comes from:

Accepted Answer

ATP

Question 14

Which of the following best describes the function of lysosomes in animal cells?

Accepted Answer

Digest macromolecules and recycle cellular components

Question 15

Which of the following is a real-world consequence of lysosomal failure in human cells?

Accepted Answer

Lysosomal storage diseases such as Tay-Sachs

Question 16

Which of the following statements about gradients is correct?

Accepted Answer

Gradients can perform chemical and mechanical work in cells

Question 17

Which of the following is NOT a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Synthesis of ATP

Question 18

Which type of transport protein may be gated, opening or closing only in response to a specific stimulus?

Accepted Answer

Channel protein

Question 19

Which of the following best explains why polar molecules such as glucose require facilitated diffusion to cross the plasma membrane?

Accepted Answer

They are repelled by the hydrophobic core of the phospholipid bilayer

Question 20

Which of the following surface molecules enables cells to recognize each other and function as markers for cell identification?

Accepted Answer

Glycolipids and glycoproteins

Cellular Membranes, Organelles, and Transport Mechanisms

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