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

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 4

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

Accepted Answer

It filters blood, reabsorbs needed substances, and excretes waste as urine.

Question 5

Which of the following is a correct balanced equation for the neutralization reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$\mathrm{HCl} + \mathrm{NaOH} \rightarrow \mathrm{NaCl} + \mathrm{H_2O}$$

Question 6

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

$$	ext{Number of half-lives} = \frac{24}{8} = 3$$

Accepted Answer

$$10\ 	ext{mg}$$

Question 7

Which of the following best explains why water has a higher boiling point than methane ($$\mathrm{CH_4$}$$)?

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, preventing cell lysis or crenation.

Question 9

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes act as biological catalysts, speeding up reactions without being used up.

Question 10

A sound wave travels through air at a speed of $$340\ \mathrm{m/s}. If $$its frequency is $$680\ \mathrm{Hz}$$, what is its wavelength?

$$\lambda = \frac{v}{f}$$

Accepted Answer

$$0.50\ \mathrm{m}$$

Question 11

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

Accepted Answer

It binds oxygen in the lungs and releases it in tissues.

Question 12

Which of the following is a property of acids in aqueous solution?

Accepted Answer

They increase the concentration of $$\mathrm{H^+}$$ ions.

Question 13

A student measures the mass of a sample as 12.345 g using a balance with three decimal places. How many significant figures should be reported?

Accepted Answer

5

Question 14

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

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 15

Which of the following is a correct statement about the Doppler effect?

Accepted Answer

The observed frequency increases as the source approaches the observer.

Question 16

Which of the following best explains why fats are solid at room temperature while oils are liquid?

Accepted Answer

Fats have more saturated fatty acids, allowing tighter packing of molecules.

Question 17

A patient with a genetic disorder has an extra copy of chromosome 21. What is this condition called?

Accepted Answer

Down syndrome

Question 18

Which of the following is the correct electron configuration for a neutral atom of sodium ($$\mathrm{Na}$$, atomic number 11)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^1$$

Question 19

A 2.0 kg object is lifted to a height of 5.0 m. What is the increase in gravitational potential energy? (Use $$g = 9.8\ \mathrm{m/s^2$}$$)

$$\Delta U = mgh$$

Accepted Answer

$$98\ \mathrm{J}$$

Question 20

Which of the following best describes the function of the serous membrane?

Accepted Answer

It lines body cavities and reduces friction between organs.

Comprehensive Study Guide: Chemistry Topics for GOB College Courses

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