Question 1

Which of the following best describes homeostasis in human biology?

Accepted Answer

The maintenance of a stable internal environment despite external changes.

Question 2

A scientist is testing the effect of a new drug on blood glucose levels. In this experiment, what is the dependent variable?

Accepted Answer

The blood glucose levels measured after treatment.

Question 3

Which of the following statements about ionic bonds is correct?

Accepted Answer

Ionic bonds are formed when electrons are completely transferred from one atom to another.

Question 4

A solution has a $$pH of 5. $$Which of the following is true about this solution?

Accepted Answer

It is acidic and has a high concentration of $$H^+$$ ions.

Question 5

Which macromolecule is primarily responsible for storing and expressing genetic information in cells?

Accepted Answer

Nucleic acids

Question 6

A patient’s blood $$pH$$ drops to 7.0. Which of the following best describes the role of biological buffers in this scenario?

Accepted Answer

Buffers absorb excess $$H^+$$ ions to help restore $$pH to $$normal levels.

Question 7

Which of the following is a property of water that is crucial for maintaining body temperature in humans?

Accepted Answer

High specific heat

Question 8

Which of the following best explains why phospholipids are essential for cell membrane structure?

Accepted Answer

They create a bilayer with hydrophilic heads facing outward and hydrophobic tails inward, allowing selective permeability.

Question 9

Which of the following is an example of a polar covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in a water molecule.

Question 10

A student mixes hydrochloric acid ($$HCl) $$into water. What happens to the $$pH of $$the solution, and why?

Accepted Answer

The $$pH$$ decreases because $$HCl$$ releases $$H^+$$ ions.

Question 11

Which biological macromolecule is most directly involved in catalyzing chemical reactions within cells?

Accepted Answer

Proteins

Question 12

A researcher observes that a plant bends toward light. Which characteristic of living organisms does this demonstrate?

Accepted Answer

Response to stimuli

Question 13

Which of the following best describes the role of the control group in a scientific experiment?

Accepted Answer

It serves as a baseline for comparison and receives no treatment.

Question 14

Which of the following is a correct pairing of macromolecule and its monomer?

Accepted Answer

Carbohydrate – Monosaccharide

Question 15

A patient is diagnosed with a genetic disorder affecting the structure of collagen. Which macromolecule is most likely involved?

Accepted Answer

Proteins

Question 16

Which of the following scenarios best illustrates the application of the scientific method?

Accepted Answer

A researcher observes a phenomenon, forms a hypothesis, conducts an experiment, and analyzes the results.

Question 17

Which property of water allows it to dissolve many substances important for biological processes?

Accepted Answer

Solvent of life due to polarity

Question 18

If a solution has a $$pH of 8$$, which statement is correct?

Accepted Answer

The solution is basic with low $$H^+$$ concentration.

Question 19

Which of the following best describes the difference between metabolism and homeostasis?

Accepted Answer

Metabolism is the sum of all chemical reactions in the body; homeostasis is the maintenance of internal stability.

Question 20

A person’s blood $$pH is $$measured at 7.40. Which of the following best describes this value?

Accepted Answer

It is within the normal range for human blood $$pH.$$

Human Biology: Introduction & Chemistry of Life Study Guide

Study Guide - Practice Questions