Question

1. in muscle cell x, the breakdown of sugar happens very quickly, releasing energy that the cell can use right away. in muscle cell y, the same breakdown process is much slower and produces less energy. what could be the reason?

a. muscle cell y uses a different type of sugar molecule.
b. muscle cell x contains an enzyme that speeds up the reaction.
c. muscle cell x has more mitochondria to store energy.
d. the sugar molecules in muscle cell y are too small to react efficiently.

1. circle all the correct statements about cell membranes!

a. changes atp to glucose
b. catalyzes (causes) protein synthesis
c. moves molecules against and with the concentration gradient
d. regulates what enters and exits the cell

1. the image on the right represents what type of transport?

a. passive transport
b. facilitated diffusion
c. exoskeleton
d. active transport

Explanation:

Question 4

• Option A: Muscle cells typically use glucose, so different sugar type is unlikely.
• Option B: Enzymes speed up reactions (catalysis). If Cell X has an enzyme speeding sugar breakdown, it would be faster, matching the scenario.
• Option C: Mitochondria produce energy, not store it.
• Option D: Sugar molecules in cells are similar in size for metabolism; size isn’t a limiting factor here.

• Option A: Cell membranes don’t convert ATP to glucose (that’s in cellular respiration pathways, not membrane function).
• Option B: Ribosomes (not cell membranes) catalyze protein synthesis.
• Option C: Cell membranes have transport proteins for active (against gradient) and passive (with gradient) transport.
• Option D: Cell membranes are selectively permeable, regulating what enters/exits the cell.

• Option A: Passive transport (e.g., diffusion, osmosis) moves with concentration gradient, no energy. But the options include active transport, and “exoskeleton” is irrelevant.
• Option B: Facilitated diffusion is a type of passive transport (with gradient, uses proteins).
• Option C: Exoskeleton is a structural feature of some organisms, not transport.
• Option D: Active transport moves against concentration gradient, requires energy. If the image shows energy - dependent transport (e.g., protein pump), it’s active transport. Since “exoskeleton” is incorrect, and if the image depicts active transport (common in such questions), D is correct. (Note: Without the image, but based on options, “exoskeleton” is a distractor. Active transport is a key transport type, and if the image shows energy - using transport, D is correct.)

Answer:

B. Muscle Cell X contains an enzyme that speeds up the reaction.

Question 6