Q: Which of the following best describes the role of the sodium-potassium pump in maintaining cell volume?

It uses ATP to expel three Na\textsuperscript{+} ions for every two K\textsuperscript{+} ions imported, regulating water movement.

Question 1

Which of the following best describes the main difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 2

A scientist discovers a new organism that is unicellular, lacks a nucleus, and thrives in extremely salty environments. To which domain does this organism most likely belong?

Accepted Answer

Archaea

Question 3

Which of the following is an example of a homologous structure, and what does its presence suggest about evolutionary relationships?

Accepted Answer

The forelimbs of a human and a whale; they suggest descent from a common ancestor.

Question 4

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

Accepted Answer

Osmosis

Question 5

A red blood cell is placed in a solution and begins to swell and eventually bursts. Which term best describes the tonicity of the solution, and what is the direction of water movement?

Accepted Answer

The solution is hypotonic; water moves into the cell.

Question 6

Which of the following best explains why soft tissue fossils are rare compared to hard tissue fossils?

Accepted Answer

Soft tissues decay quickly and are rarely preserved.

Question 7

Which of the following is a correct sequence of the scientific method as applied in a controlled experiment?

Accepted Answer

Observe → Formulate a question → Formulate a hypothesis → Make a prediction → Experiment → Modify hypothesis

Question 8

A patient is unable to produce enough ATP due to a defect in the electron transport system. Which organelle is most likely malfunctioning?

Accepted Answer

Mitochondria

Question 9

Which of the following best describes the role of the sodium-potassium pump in maintaining cell volume?

Accepted Answer

It uses ATP to expel three Na	extsuperscript{+} ions for every two K	extsuperscript{+} ions imported, regulating water movement.

Question 10

Which of the following is NOT a characteristic of all living things?

Accepted Answer

They all have a backbone.

Question 11

A scientist is comparing the amino acid sequence of cytochrome c in humans and yeast. She finds over 50 differences. What does this suggest about their evolutionary relationship?

Accepted Answer

Humans and yeast diverged from a common ancestor a long time ago.

Question 12

Which of the following best illustrates the concept of 'unity in diversity' as explained by Darwin's theory of evolution?

Accepted Answer

The forelimbs of bats, whales, and humans share a common skeletal structure but serve different functions.

Question 13

Which of the following is a function of the basement membrane in epithelial tissue?

Accepted Answer

It provides structural support and attaches epithelial tissue to underlying tissues.

Question 14

A person is exposed to a cold environment. Which of the following best describes the negative feedback response to maintain homeostasis?

Accepted Answer

Sensors detect a drop in body temperature, the hypothalamus signals effectors, and blood vessels constrict to reduce heat loss.

Question 15

Which of the following best describes the difference between anabolism and catabolism?

Accepted Answer

Anabolism builds larger molecules from smaller ones and requires energy; catabolism breaks down larger molecules and releases energy.

Question 16

Which of the following is a correct description of the plasma membrane?

Accepted Answer

It is a selectively permeable lipid bilayer with embedded proteins and carbohydrates.

Question 17

Which of the following best explains why the scientific method requires a control group in experiments?

Accepted Answer

To minimize the effects of unwanted variables and allow comparison with the experimental group.

Question 18

Which of the following is an example of positive feedback in the human body?

Accepted Answer

Amplification of uterine contractions during childbirth.

Question 19

A cell is observed to have numerous mitochondria, a well-developed rough endoplasmic reticulum, and a prominent Golgi apparatus. Which type of cell is this most likely to be, and why?

Accepted Answer

A muscle cell, because it requires large amounts of energy and protein synthesis for contraction.

Human Biology: Foundations, Cells, and Evolution – Structured Study Notes

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