Q: A solution has a pH of 5. What is the hydrogen ion concentration $$[H^+] in $$this solution?

$$[H^+] = 1 \times 10$$^{-5}$$ \text{ M}$$

Question 1

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

Accepted Answer

A hypothesis is a tentative explanation that can be tested, while a theory is a comprehensive explanation supported by a large body of 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 excellent 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 5. What is the hydrogen ion concentration $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-5}$$ 	ext{ M}$$

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 type of bond is responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 8

A student mixes oil and water in a beaker. After shaking, the oil forms a layer on top of the water. Which property of lipids explains this observation?

Accepted Answer

Lipids are hydrophobic and do not mix with water.

Question 9

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

Accepted Answer

Dehydration synthesis joins monomers to form polymers by removing water, while hydrolysis breaks polymers into monomers by adding water.

Question 10

Which of the following is NOT a component of a nucleotide in DNA?

Accepted Answer

Amino acid

Question 11

A mutation causes a change in the primary structure of a protein. Which level(s) of protein structure could be affected as a result?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures

Question 12

Which of the following statements about phospholipids is correct?

Accepted Answer

Phospholipids have both hydrophilic and hydrophobic regions.

Question 13

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

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds create an open lattice structure.

Question 14

Which of the following is a correct comparison between DNA and RNA?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 15

A scientist wants to compare the means of two experimental groups. Which statistical test is most appropriate?

Accepted Answer

t-test

Question 16

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

Accepted Answer

Hydrogen bonds allow water molecules to stick together, resulting in cohesion and surface tension.

Question 17

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 18

Which of the following macromolecules is NOT a polymer?

Accepted Answer

Lipids

Question 19

Which of the following best explains the amphipathic nature of phospholipids?

Accepted Answer

Phospholipids have both a hydrophilic phosphate head and hydrophobic fatty acid tails.

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

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