Q: Which of the following is a correct statement about acids and bases in aqueous solution?

Bases decrease the concentration of $$\text{H}^+$$ ions.

Question 1

Which of the following statements best explains why meiosis, but not mitosis, leads to genetic variation among offspring?

Accepted Answer

Meiosis includes crossing over and independent assortment, which shuffle genetic material.

Question 2

A patient is diagnosed with anemia due to a mutation affecting hemoglobin structure. Which process is directly responsible for translating the mutated gene into the abnormal hemoglobin protein?

Accepted Answer

Translation

Question 3

Which of the following best describes the function of the nephron in the kidney?

Accepted Answer

It filters blood, reabsorbs water, and forms urine.

Question 4

A solution is prepared by dissolving 5.00 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 250 mL of solution. What is the molarity of the solution?

$$	ext{Molarity} = \frac{	ext{moles of solute}}{	ext{liters of solution}}$$

Accepted Answer

$$0.342\ 	ext{M}$$

Question 5

Which of the following is a correct statement about acids and bases in aqueous solution?

Accepted Answer

Bases decrease the concentration of $$	ext{H}^+$$ ions.

Question 6

A radioactive isotope has a half-life of 8 hours. If you start with 80 mg, how much remains after 24 hours?

$$	ext{Remaining mass} = 	ext{Initial mass} 	imes \left(\frac{1}{2}\$$right)^{n}$$, where n$$ = \frac{	ext{elapsed time}}{	ext{half-life}}$$

Accepted Answer

10 mg

Question 7

Which of the following best explains why water has a higher boiling point than methane ($$	ext{CH}_4$$)?

Accepted Answer

Water molecules form hydrogen bonds, which require more energy to break.

Question 8

A patient is given 500 mL of a 0.9% NaCl solution intravenously. Which property of this solution makes it suitable for intravenous use?

Accepted Answer

It is isotonic with blood plasma.

Question 9

Which of the following best describes the role of enzymes in biological systems?

Accepted Answer

They act as catalysts, speeding up reactions without being consumed.

Question 10

A carboxylic acid reacts with an alcohol to form which type of compound?

$$	ext{R-COOH} + 	ext{R'-OH} ightarrow 	ext{R-COOR'} + 	ext{H}_2	ext{O}$$

Accepted Answer

Ester

Question 11

Which of the following statements about DNA is correct?

Accepted Answer

DNA is double-stranded and uses complementary base pairing.

Question 12

A 70 kg person stands on a scale in an elevator accelerating upward at $$2\ 	ext{m/s}^2. $$What is the apparent weight? (Take $$g = 9.8\ 	ext{m/s}^2$$)

$$F = m(a + g)$$

Accepted Answer

$$826\ 	ext{N}$$

Question 13

Which of the following best describes the Doppler effect as it applies to sound?

Accepted Answer

The frequency of sound increases as the source moves toward the observer.

Question 14

Which of the following is a property of a buffer solution?

Accepted Answer

It resists changes in pH when small amounts of acid or base are added.

Question 15

Which of the following best describes the function of hemoglobin in the human body?

Accepted Answer

It transports oxygen from the lungs to tissues.

Question 16

A sample of gas occupies 2.0 L at 1.0 atm and 300 K. What will be its volume at 2.0 atm and 300 K? (Assume ideal gas behavior)

$$P_1V_1 = P_2V_2$$

Accepted Answer

1.0 L

Question 17

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

Accepted Answer

Proteins are polymers of amino acids linked by peptide bonds.

Question 18

Which of the following best explains why a person floats more easily in seawater than in freshwater?

Accepted Answer

Seawater has a higher density, increasing the buoyant force.

Question 19

Which of the following is a correct description of the function of the endocrine system?

Accepted Answer

It secretes hormones that regulate physiological processes.

Question 20

Which of the following best describes the difference between an exothermic and an endothermic reaction?

Accepted Answer

Exothermic reactions release heat, while endothermic reactions absorb heat.

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