Q: A solution has a pH of 4. What is the hydrogen ion concentration $$[H^+] of $$this solution?

$$[H^+] = 1 \times 10$$^{-4}$$ \ \mathrm{M}$$

Question 1

Which of the following best describes the difference between cytology and histology?

Accepted Answer

Cytology examines the structure and function of individual cells, while histology studies the organization and structure of tissues.

Question 2

A patient is unable to maintain a stable internal body temperature when exposed to cold environments. Which concept does this scenario best illustrate?

Accepted Answer

Homeostasis and the failure of a negative feedback mechanism

Question 3

Which of the following is an example of a positive feedback loop in the human body?

Accepted Answer

Blood clotting after an injury

Question 4

Which equation correctly represents the metabolism equation for cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP$$

Question 5

Which of the following best describes the hierarchical levels of organization in the human body from smallest to largest?

Accepted Answer

Molecule, cell, tissue, organ, organ system, organism

Question 6

A scientist is studying the movement of sodium ions across a cell membrane. Which type of transport is most likely being observed if the process requires ATP and moves sodium against its concentration gradient?

Accepted Answer

Active transport

Question 7

Which of the following statements about the sodium-potassium pump is correct?

Accepted Answer

It moves 3 sodium ions out of the cell and 2 potassium ions into the cell per ATP hydrolyzed.

Question 8

Which of the following best explains why water is considered the universal solvent in biological systems?

Accepted Answer

Water is polar and can dissolve many ionic and polar substances.

Question 9

A solution has a pH of 4. What is the hydrogen ion concentration $$[H^+] of $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ \ \mathrm{M}$$

Question 10

Which of the following best describes the difference between dehydration synthesis and hydrolysis?

Accepted Answer

Dehydration synthesis joins monomers by removing water; hydrolysis breaks polymers into monomers by adding water.

Question 11

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Nucleic acid – nucleotide

Question 12

A red blood cell is placed in a hypotonic solution. What will most likely happen to the cell?

Accepted Answer

The cell will swell and may burst due to water entering.

Question 13

Which of the following best describes the role of enzymes in chemical reactions?

Accepted Answer

Enzymes decrease the activation energy, increasing the reaction rate.

Question 14

Which of the following bonds is the strongest and least likely to dissolve in water?

Accepted Answer

Covalent bond

Question 15

Which organelle is primarily responsible for ATP production in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 16

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 17

Which of the following best describes the Central Dogma of Biology?

Accepted Answer

DNA is transcribed into RNA, which is translated into protein.

Question 18

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Their hydrophilic heads interact with water, while their hydrophobic tails avoid water.

Question 19

A mutation causes a protein to lose its tertiary structure but retain its primary structure. Which level of protein structure is most directly affected?

Accepted Answer

Tertiary structure

Question 20

Which of the following best describes the function of ribosomes in a cell?

Accepted Answer

Ribosomes synthesize proteins by translating mRNA.

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