Question 1

Which of the following best describes the process of homeostasis in humans?

Accepted Answer

Maintaining a stable internal environment despite external changes.

Question 2

A scientist is testing the effect of different fertilizers on plant height. In this experiment, what is the independent variable?

Accepted Answer

Type of fertilizer used

Question 3

Which of the following is a correct sequence for the levels of biological organization from smallest to largest?

Accepted Answer

Atom $$\rightarrow$$ Molecule $$\rightarrow$$ Organelle $$\rightarrow$$ Cell $$\rightarrow$$ Tissue $$\rightarrow$$ Organ $$\rightarrow$$ Organ system $$\rightarrow$$ Organism

Question 4

Which macromolecule is primarily responsible for storing genetic information?

Accepted Answer

Nucleic acids

Question 5

A patient is given a saline IV solution that is isotonic to their blood. What will happen to their red blood cells?

Accepted Answer

There will be no net movement of water; the cells will remain unchanged.

Question 6

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Eukaryotic cells contain a nucleus and organelles, while prokaryotic cells do not.

Question 7

Which type of chemical bond involves the transfer of electrons from one atom to another?

Accepted Answer

Ionic bond

Question 8

A solution has a pH of 3. Which of the following best describes this solution?

Accepted Answer

It is acidic, with a high concentration of $$\mathrm{H^+}$$ ions.

Question 9

During cellular respiration, which stage produces the most ATP?

Accepted Answer

Electron Transport Chain

Question 10

Which organelle is responsible for producing ATP in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 11

A white blood cell engulfs a bacterium by surrounding it with its membrane and bringing it inside. What is this process called?

Accepted Answer

Phagocytosis

Question 12

Which of the following best explains why water molecules are attracted to each other?

Accepted Answer

Hydrogen bonds form between the slightly positive hydrogen of one molecule and the slightly negative oxygen of another.

Question 13

A scientist uses a double-blind procedure in a clinical trial. What is the main advantage of this method?

Accepted Answer

It prevents both the participants and the experimenters from knowing who receives the treatment, reducing bias.

Question 14

Which of the following is an example of a dehydration synthesis reaction?

Accepted Answer

Forming a polysaccharide from glucose monomers by removing water.

Question 15

A buffer system in the blood helps maintain pH homeostasis. If a strong acid is added to the blood, what will the buffer do?

Accepted Answer

Absorb excess $$\mathrm{H^+}$$ ions to minimize pH change.

Question 16

Which of the following best describes the function of phospholipids in the cell membrane?

Accepted Answer

They form a bilayer that acts as a barrier to most water-soluble substances.

Question 17

Which of the following is a correct statement about the scientific method?

Accepted Answer

A hypothesis is a testable explanation that can be supported or refuted by experiments.

Question 18

Which of the following best explains why lactic acid builds up in muscles during intense exercise?

Accepted Answer

Oxygen is not available, so cells switch to fermentation, producing lactic acid.

Question 19

Which of the following is true about facilitated diffusion?

Accepted Answer

It moves molecules down their concentration gradient through a protein channel without using energy.

Question 20

Which of the following best describes the role of ribosomes in a cell?

Accepted Answer

They synthesize proteins by linking amino acids together.

Introduction to Biology and Chemistry of Life: Foundational Concepts for Anatomy & Physiology

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