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

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

Question 1

Which of the following best describes the difference between a hypothesis and a theory in scientific investigation?

Accepted Answer

A hypothesis is a tentative explanation that can be tested, while a theory is a comprehensive explanation supported by evidence.

Question 2

A scientist is testing the effect of pH on enzyme activity. She keeps temperature and substrate concentration constant, but varies the pH. What is the independent variable in this experiment?

Accepted Answer

pH

Question 3

Which of the following best explains why water is an effective solvent for biological molecules?

Accepted Answer

Water forms hydrogen bonds with polar molecules, allowing them to dissolve.

Question 4

Which equation correctly represents the relationship between pH and hydrogen ion concentration $$[H^+]$$?

Accepted Answer

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

Question 5

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

Accepted Answer

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

Question 6

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

DNA is a double-stranded molecule with antiparallel strands and deoxyribose sugar.

Question 7

Which of the following bonds is responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 8

A patient is diagnosed with a genetic disorder that affects the phosphodiester bonds in their DNA. Which process would be most directly impacted?

Accepted Answer

Formation of the DNA backbone

Question 9

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds and are solid at room temperature; unsaturated fatty acids have one or more double bonds and are liquid at room temperature.

Question 10

Which of the following is NOT a function of water in biological systems?

Accepted Answer

Providing structural support for cell walls

Question 11

Which of the following statements about carbohydrates is correct?

Accepted Answer

Carbohydrates are polymers made of monosaccharide monomers joined by glycosidic bonds.

Question 12

A protein loses its tertiary structure due to exposure to high temperature. What is the most likely consequence?

Accepted Answer

The protein will lose its function because the shape required for activity is lost.

Question 13

Which of the following correctly matches the macromolecule with its monomer?

Accepted Answer

Carbohydrate: monosaccharide

Question 14

Which of the following is true about the directionality of DNA strands?

Accepted Answer

The two strands are antiparallel, one running 5' to 3' and the other 3' to 5'.

Question 15

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

Accepted Answer

Phospholipids have hydrophilic heads and hydrophobic tails, causing them to arrange in bilayers with tails facing inward.

Question 16

Which of the following is a correct statement about RNA compared to DNA?

Accepted Answer

RNA is usually single-stranded and contains ribose sugar.

Question 17

A scientist wants to compare the means of two experimental groups. Which statistical test should she use to determine if the difference is significant?

Accepted Answer

t-test

Question 18

Which of the following is true about dehydration synthesis?

Accepted Answer

It joins monomers to form polymers by removing water.

Question 19

Which of the following best describes the role of hydrogen bonds in the properties of water?

Accepted Answer

Hydrogen bonds allow water to exhibit cohesion, adhesion, and surface tension.

Question 20

A DNA molecule is found to have 20% adenine. According to Chargaff's rules, what percentage of guanine would you expect?

Accepted Answer

30%

General Biology: Key Concepts and Molecular Foundations (Campbell Biology AP, 10e)

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