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

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

Question 1

Which of the following best illustrates the theme of 'energy and matter' in biological systems?

Accepted Answer

The conversion of glucose and oxygen into carbon dioxide, water, and ATP during cellular respiration.

Question 2

A scientist wants to test the effect of light intensity on the rate of photosynthesis in plants. Which of the following is the dependent variable in this experiment?

Accepted Answer

The rate of photosynthesis measured by oxygen production.

Question 3

Which level of biological organization is directly above 'cell' and below 'organism'?

Accepted Answer

Tissue

Question 4

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 5

A buffer solution contains a weak acid and its conjugate base. If a small amount of strong acid is added, what will happen to the pH?

Accepted Answer

The pH will decrease slightly.

Question 6

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

Accepted Answer

It is the site of ATP production through cellular respiration.

Question 7

Which of the following statements about water is correct?

Accepted Answer

Water has a high specific heat, allowing it to moderate temperature changes.

Question 8

Which macromolecule is correctly matched with its monomer?

Accepted Answer

Carbohydrate — Monosaccharide

Question 9

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

Accepted Answer

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

Question 10

Which of the following is a polysaccharide used for energy storage in animals?

Accepted Answer

Glycogen

Question 11

Which of the following best explains why ice floats on water?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds hold water molecules further apart in the solid state.

Question 12

Which organelle is responsible for packaging and shipping proteins in eukaryotic cells?

Accepted Answer

Golgi apparatus

Question 13

Which of the following is true about the fluid mosaic model of membrane structure?

Accepted Answer

Proteins float in or on the fluid phospholipid bilayer, allowing lateral movement.

Question 14

Which of the following is a correct sequence of levels of protein structure from simplest to most complex?

Accepted Answer

Primary $$\rightarrow$$ Secondary $$\rightarrow$$ Tertiary $$\rightarrow$$ Quaternary

Question 15

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 16

A patient is diagnosed with a disorder that affects the function of lysosomes. Which cellular process is most likely to be impaired?

Accepted Answer

Digestion of macromolecules

Question 17

Which of the following is an example of a controlled experiment?

Accepted Answer

Testing the effect of different fertilizer types on plant growth while keeping all other variables constant.

Question 18

Which of the following best describes the role of emergent properties in biology?

Accepted Answer

They are new functions that arise at each level of biological organization due to the arrangement and interactions of parts.

Question 19

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

Hydrogen bonds form between polar molecules, such as water.

Question 20

Which of the following best explains the importance of enzyme specificity?

Accepted Answer

Enzyme specificity ensures that only particular substrates are converted to products, allowing precise regulation of cellular processes.

General Biology: Core Themes, Chemistry of Life, and Cell Structure

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