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

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 most ATP is synthesized?

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.

$$	ext{Phospholipid bilayer} = 	ext{hydrophilic heads} + 	ext{hydrophobic tails}$$

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 and molecules.

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, driven by the concentration gradient.

Question 9

Which of the following statements about covalent, ionic, and hydrogen bonds is correct?

Accepted Answer

Covalent bonds involve the sharing of electrons, ionic bonds involve the transfer of electrons, and hydrogen bonds are weak attractions between polar molecules.

Question 10

Which of the following best explains why DNA is important for living organisms?

Accepted Answer

DNA stores genetic information necessary for the synthesis of proteins and the regulation of cellular activities.

Question 11

Which of the following is a function of the rough endoplasmic reticulum (RER)?

Accepted Answer

Synthesis of proteins that are either secreted from the cell or inserted into membranes.

Question 12

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 13

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 14

Which of the following tissues is found lining the stomach and is responsible for contraction during digestion?

Accepted Answer

Smooth muscle tissue

Question 15

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 16

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

Accepted Answer

Transmission of electrical impulses

Question 17

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

Accepted Answer

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

Question 18

Which of the following best describes the function of tight junctions in epithelial tissue?

Accepted Answer

They create a seal between adjacent cells, preventing the passage of substances between them.

Question 19

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

Accepted Answer

Iron (Fe)

Question 20

A patient is injected with a radioisotope for a PET scan. Why is radioisotope technology important in medicine?

Accepted Answer

It allows visualization of metabolic processes in real time by detecting emitted radiation.

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

Guida di studio - Domande di pratica

Study guide - Flashcard