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 cellular metabolism.

Question 2

Which organelle is responsible for synthesizing proteins, and what is its shape?

Accepted Answer

Ribosome; spherical or small granule-like

Question 3

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

Accepted Answer

Transmission electron microscopy, because it allows visualization of internal cell structures at very high resolution.

Question 4

Which of the following is NOT one of the most abundant elements in the human body?

Accepted Answer

Iron

Question 5

Why is DNA considered essential for life?

Accepted Answer

It stores genetic information necessary for the synthesis of proteins and inheritance.

Question 6

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two atoms.

Question 7

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 causes it?

Accepted Answer

Polarity, caused by unequal sharing of electrons.

Question 8

What happens when a negatively charged element encounters a positively charged element?

Accepted Answer

They attract each other and may form an ionic bond.

Question 9

A solution has a pH of 3. Which statement is correct regarding its acidity?

Accepted Answer

It is acidic because its pH is below 7.

Question 10

Which of the following correctly lists the steps of the scientific method in order?

Accepted Answer

Observation, hypothesis, experiment, analysis, conclusion

Question 11

Homeostasis is best defined as:

Accepted Answer

The maintenance of a stable internal environment despite external changes.

Question 12

Which of the following statements best distinguishes an element from a molecule?

Accepted Answer

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

Question 13

Which characteristic is shared by both living and nonliving things?

Accepted Answer

Presence of atoms and molecules

Question 14

Why is radioisotope technology important in biological research?

Accepted Answer

It enables tracking of molecules and metabolic pathways in living organisms.

Question 15

How can atoms change their charges?

Accepted Answer

By gaining or losing electrons.

Question 16

Which equation best represents the process of diffusion across a membrane?

Accepted Answer

$$ J = -D \frac{dC}{dx} $$

Question 17

During the electron transport chain, most ATP is produced by which protein complex?

Accepted Answer

ATP synthase

Question 18

Which of the following substances can freely pass through the plasma membrane without assistance?

Accepted Answer

Small nonpolar molecules like $$ O_2$ $$ and $$ CO_2$ $$

Question 19

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

Accepted Answer

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

Question 20

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

Accepted Answer

Smooth muscle; involuntary contraction for digestion

Human Biology Exam 1 Study Guide: Chapters 1-4 (Cells, Chemistry, Tissues, and Organ Systems)

Study Guide - Practice Questions

Study Guide - Flashcards