Q: Which organelle is responsible for the majority of ATP production during cellular respiration, and what is the name of the protein complex where this occurs?

Mitochondrion; ATP synthase $$\text{ADP} + \text{P}_i \xrightarrow{\text{ATP synthase}} \text{ATP}$$

Question 1

Which of the following best explains why cells are typically small in size rather than large?

Accepted Answer

Smaller cells have a higher surface area-to-volume ratio, which facilitates efficient exchange of materials with their environment.

$$	ext{Surface Area} = 6a^2$, $$	ext{Volume} = $$a^3$$ for a cube$

Question 2

Which organelle is responsible for the majority of ATP production during cellular respiration, and what is the name of the protein complex where this occurs?

Accepted Answer

Mitochondrion; ATP synthase

$$	ext{ADP} + 	ext{P}_i \xrightarrow{	ext{ATP synthase}} 	ext{ATP}$$

Question 3

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

Accepted Answer

Transmission electron microscopy (TEM), because it provides high-resolution images of internal cell structures.

Question 4

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

Accepted Answer

It is composed primarily of a phospholipid bilayer with embedded proteins.

$$	ext{Phospholipid bilayer} + 	ext{Proteins} + 	ext{Carbohydrates}$$

Question 5

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

Accepted Answer

An element consists of only one type of atom, while a molecule consists of two or more atoms chemically bonded together.

Question 6

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

Accepted Answer

Both are composed of atoms.

Question 7

A solution has a pH of 3. Which of the following statements is true about this solution?

Accepted Answer

It is acidic, with a high concentration of hydrogen ions.

$$	ext{pH} = -\log_{10}[H^+]$$

Question 8

Which of the following best describes the process of diffusion?

Accepted Answer

The movement of molecules from an area of higher concentration to an area of lower concentration, down their concentration gradient.

Question 9

Which of the following statements about DNA is correct?

Accepted Answer

DNA stores genetic information necessary for the synthesis of proteins.

Question 10

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.

$$	ext{NAD}^+ + 2e^- + 2H^+ ightarrow 	ext{NADH} + H^+$$

Question 11

Which of the following is NOT a function of connective tissue?

Accepted Answer

Conducting electrical impulses.

Question 12

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

Accepted Answer

Smooth muscle; involuntary contraction to move food through the digestive tract.

Question 13

Which of the following best describes an isotonic solution and its effect on animal cells?

Accepted Answer

An isotonic solution has the same solute concentration as the cell, resulting in no net movement of water and maintaining cell shape.

Question 14

Which of the following statements about active transport is correct?

Accepted Answer

Active transport moves substances against their concentration gradient using energy, often in the form of ATP.

Question 15

Which of the following is a real-world application of radioisotope technology in medicine?

Accepted Answer

Using radioactive tracers to diagnose and monitor diseases such as cancer.

Question 16

Which of the following best describes the concept of reductionism in biology?

Accepted Answer

Studying complex biological systems by breaking them down into their simpler components.

Question 17

Which of the following molecules is most likely to pass freely through the plasma membrane without assistance?

Accepted Answer

Oxygen ($$O_2$$), because it is small and nonpolar.

Question 18

Which of the following is the correct order of the scientific method?

Accepted Answer

Observation, hypothesis, experiment, analysis, conclusion

Question 19

Which type of cell junction allows for the direct passage of ions and small molecules between adjacent animal cells?

Accepted Answer

Gap junction

Question 20

Which of the following is the most abundant element in the human body by mass?

Accepted Answer

Oxygen

Human Biology Exam 1 Study Guide: Domains of Life, Cell Structure, Chemistry, and Tissues

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