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

It is acidic, because its pH is less than 7. $$\text{pH} \u003c 7 \implies \text{Acidic}$$

Question 1

Which of the following best explains why cells are generally 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. 
$$	ext{Surface Area to Volume Ratio} = \frac{	ext{Surface Area}}{	ext{Volume}}$$

Question 2

A scientist is using a microscope to observe the detailed internal structure of mitochondria. 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 3

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

Accepted Answer

It is composed primarily of a phospholipid bilayer with embedded proteins. 
$$	ext{Plasma Membrane} = 	ext{Phospholipid Bilayer} + 	ext{Proteins}$$

Question 4

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

Accepted Answer

It produces ATP through cellular respiration, especially during the electron transport chain. 
$$	ext{ADP} + 	ext{P}_i ightarrow 	ext{ATP}$$

Question 5

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

Accepted Answer

Iron (Fe)

Question 6

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

Accepted Answer

It is acidic, because its pH is less than 7. 
$$	ext{pH} \u003c 7 \implies 	ext{Acidic}$$

Question 7

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 bonded together. 
$$	ext{Element: } 	ext{O}_2 ($$oxygen atom) 
$$	ext{Molecule: } 	ext{H}_2	ext{O} ($$water molecule)

Question 8

Which of the following is a function of the Golgi apparatus?

Accepted Answer

Modifying, sorting, and packaging proteins for secretion.

Question 9

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 until equilibrium is reached.

Question 10

Which of the following statements about active transport is correct?

Accepted Answer

It requires energy, often in the form of ATP, to move substances against their concentration gradient. 
$$	ext{Active Transport:} \quad 	ext{Low} ightarrow 	ext{High} \quad (	ext{requires ATP})$$

Question 11

A red blood 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 12

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

Accepted Answer

They accept electrons during the cycle and transfer them to the electron transport chain. 
$$	ext{NAD}^+ + 2e^- + 2H^+ ightarrow 	ext{NADH} + H^+$$

Question 13

Which of the following molecules can most easily pass through the plasma membrane by simple diffusion?

Accepted Answer

Small, nonpolar molecules such as $$	ext{O}_2$$ and $$	ext{CO}_2.$$

Question 14

Which type of muscle tissue is found in the stomach wall?

Accepted Answer

Smooth muscle

Question 15

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

Accepted Answer

They are composed of atoms and molecules.

Question 16

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom covalently bonded to an electronegative atom and another electronegative atom.

Question 17

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

Accepted Answer

Understanding complex biological systems by studying their simpler components.

Question 18

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

Accepted Answer

Observation, Hypothesis, Experiment, Data Collection, Conclusion

Question 19

Which of the following best describes the function of tight junctions in animal tissues?

Accepted Answer

They form a seal between adjacent cells to prevent the passage of materials between them.

Question 20

Why is radioisotope technology important in biological research?

Accepted Answer

It allows scientists to trace the movement of substances within organisms by using radioactive isotopes as markers.

BIOS 110 Exam 1 Study Notes: Foundations of Human Biology (Chapters 1-4)

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