Question 1

Which of the following best describes the relationship between cell size and surface area, and why is this relationship important for cellular function?

Accepted Answer

As cell size increases, volume increases faster than surface area, which can limit the rate of diffusion and nutrient uptake.

Question 2

A scientist is using a microscope to observe the internal structure of mitochondria. Which type of microscopy should they use, and why?

Accepted Answer

Transmission electron microscopy, because it can reveal fine details of internal structures by passing electrons through the specimen.

Question 3

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

Accepted Answer

Synthesizing proteins for cellular use.

Question 4

Which protein complex is responsible for most ATP production during the electron transport chain, and what is the main mechanism by which it operates?

Accepted Answer

ATP synthase; it uses the proton gradient to synthesize ATP from ADP and $$	ext{P}_i.$$

Question 5

Which of the following elements is most abundant in the human body?

Accepted Answer

Oxygen

Question 6

A molecule has a partial positive charge on one end and a partial negative charge on the other. Which property does this molecule exhibit, and what type of bond can it form with water?

Accepted Answer

Polarity; it forms hydrogen bonds with water.

Question 7

Which of the following best describes the process of diffusion?

Accepted Answer

Movement of molecules from an area of high concentration to low concentration, without energy input.

Question 8

A cell is placed in an isotonic solution. What will happen to the cell, and why?

Accepted Answer

The cell will remain the same size because there is no net movement of water.

Question 9

Which of the following statements about active transport is correct?

Accepted Answer

Active transport moves substances against their concentration gradient using ATP.

Question 10

Which of the following is a characteristic shared by both living and nonliving things?

Accepted Answer

Presence of atoms and molecules

Question 11

Which of the following best explains why radioisotope technology is important in biological research?

Accepted Answer

It enables tracking of molecules and metabolic pathways by emitting detectable radiation.

Question 12

During glycolysis, what is the main purpose of the pathway?

Accepted Answer

To break down glucose into pyruvate and generate ATP and NADH.

Question 13

Which of the following best describes the scientific method in order?

Accepted Answer

Observation, hypothesis, experiment, analysis, conclusion.

Question 14

Which of the following is true about the hierarchy of living organisms?

Accepted Answer

Cells are the smallest unit, followed by tissues, organs, organ systems, and organisms.

Question 15

Which of the following best describes the difference between an element and a molecule?

Accepted Answer

An element is a pure substance made of one type of atom, while a molecule is made of two or more atoms bonded together.

Question 16

Which of the following best describes the function of the mitochondria?

Accepted Answer

Produces ATP through cellular respiration.

Question 17

Which type of muscle is found in the stomach, and what is its primary function?

Accepted Answer

Smooth muscle; involuntary contraction to move food.

Question 18

Which of the following statements about the plasma membrane is correct?

Accepted Answer

It is composed mainly of phospholipids, proteins, and cholesterol.

Question 19

Which of the following best describes the role of electron carriers during the citric acid cycle?

Accepted Answer

They accept electrons from metabolic intermediates and transfer them to the electron transport chain.

Question 20

Which of the following types of junctions allows for direct communication between adjacent cells?

Accepted Answer

Gap junctions

Human Biology Exam 1 Study Guide: Chapters 1-4

Study Guide - Practice Questions

Study Guide - Flashcards