Q: Which equation describes the sodium-potassium pump's action in active transport?

$$3\text{Na}^+_{\text{out}} + 2\text{K}^+_{\text{in}} + \text{ATP} \rightarrow 3\text{Na}^+_{\text{out}} + 2\text{K}^+_{\text{in}}$$

Question 1

Which structure is represented by the first image, and what is its primary function in the cell?

Accepted Answer

Plasma membrane; regulates the movement of substances into and out of the cell

Question 2

In the fluid mosaic model of the plasma membrane, which component is responsible for cell recognition?

Accepted Answer

Carbohydrate chains

Question 3

Referencing the second image, which organelle is responsible for protein synthesis and can be found both free in the cytoplasm and attached to the rough ER?

Accepted Answer

Ribosomes

Question 4

The third image shows a plant cell. Which structure is unique to plant cells and is involved in photosynthesis?

Accepted Answer

Chloroplast

Question 5

Which equation best represents the relationship between surface area ($$A) $$and volume ($$V) $$for a spherical cell, and why is this ratio important?

Accepted Answer

$$A = 4\pi r^2$, V$$ = \frac{4}{3}\pi $$r^3$$; the ratio affects the efficiency of material exchange$

Question 6

Which organelle, shown in the fourth image, is responsible for producing ATP through cellular respiration?

Accepted Answer

Mitochondrion

Question 7

The fifth image depicts an organelle found only in plant cells. What is the main function of this organelle?

Accepted Answer

Photosynthesis

Question 8

Which of the following statements about prokaryotic cells is correct?

Accepted Answer

Their DNA is located in the nucleoid region

Question 9

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

Accepted Answer

Osmosis

Question 10

A red blood cell placed in a hypertonic solution will:

Accepted Answer

Shrivel due to water loss

Question 11

Which equation describes the sodium-potassium pump's action in active transport?

Accepted Answer

$$3	ext{Na}^+_{	ext{out}} + 2	ext{K}^+_{	ext{in}} + 	ext{ATP} ightarrow 3	ext{Na}^+_{	ext{out}} + 2	ext{K}^+_{	ext{in}}$$

Question 12

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

Accepted Answer

DNA replication

Question 13

Which structure in animal cells anchors the nucleus and stabilizes organelles?

Accepted Answer

Intermediate filaments

Question 14

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

Accepted Answer

Active transport

Question 15

Which organelle is part of the endomembrane system and is responsible for modifying, storing, and packaging proteins?

Accepted Answer

Golgi apparatus

Question 16

Which equation best describes the diffusion of molecules across a membrane?

Accepted Answer

$$J = -D \frac{dC}{dx}$$, where $$J is $$flux, $$D is $$diffusion coefficient, and $$\frac{dC}{dx} is $$concentration gradient$

Question 17

Which structure is responsible for breaking down fatty acids and detoxifying harmful substances in the cell?

Accepted Answer

Peroxisome

Question 18

Which type of cell junction allows for direct communication between animal cells?

Accepted Answer

Gap junctions

Question 19

Which cytoskeletal element is involved in muscle contraction and cell division?

Accepted Answer

Microfilaments

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