Question 1

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

Accepted Answer

Ice has a lower density than liquid water because its molecules form a lattice structure with more open space.

Question 2

A scientist wants to test the effect of pH on enzyme activity. Which part of the experiment should remain unchanged to serve as a control?

Accepted Answer

The temperature at which the experiment is conducted

Question 3

Which property of water is primarily responsible for its high surface tension?

Accepted Answer

Cohesive forces due to hydrogen bonding

Question 4

Which of the following best describes a buffer in biological systems?

Accepted Answer

A chemical that resists changes in pH by neutralizing added acids or bases

Question 5

Given the atomic number ($$Z) $$and mass number ($$A) of an $$element, which formula correctly calculates the number of neutrons?

Accepted Answer

$$\mathrm{Number\ of\ neutrons} = A - Z$$

Question 6

Which of the following is a correct example of an ionic compound?

Accepted Answer

NaCl

Question 7

Which statement about acids and bases is correct?

Accepted Answer

Acids release hydrogen ions ($$\mathrm{H^+}) $$into solution.

Question 8

A molecule of water has which of the following geometries?

Accepted Answer

Bent

Question 9

Which of the following best describes the difference between polar and non-polar covalent bonds?

Accepted Answer

Polar covalent bonds have an uneven distribution of electrons, resulting in partial charges.

Question 10

Which of the following is NOT a function of water in the human body?

Accepted Answer

Production of genetic material

Question 11

Which of the following best describes the scientific method?

Accepted Answer

A systematic approach involving observation, hypothesis formation, experimentation, and analysis

Question 12

Which of the following is true about eukaryotic cells?

Accepted Answer

They contain a true nucleus.

Question 13

Which of the following is a property of molecules that can be affected by hydrogen bonding?

Accepted Answer

Boiling point

Question 14

Which of the following is the correct order of the biological classification scheme from most inclusive to least inclusive?

Accepted Answer

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 15

Which of the following best describes the role of carbonic acid in human blood?

Accepted Answer

It acts as a buffer to maintain pH stability.

Question 16

Which of the following is a correct example of a cation?

Accepted Answer

$$\mathrm{Na^+}$$

Question 17

Which of the following is a correct formula for calculating the atomic mass of an element with two isotopes?

Accepted Answer

$$\mathrm{Atomic\ mass} = (\%\ \mathrm{abundance\ of\ isotope\ 1} 	imes \mathrm{mass\ of\ isotope\ 1}) + (\%\ \mathrm{abundance\ of\ isotope\ 2} 	imes \mathrm{mass\ of\ isotope\ 2})$$

Question 18

Which of the following is NOT a type of radioactive emission?

Accepted Answer

Delta particles

Question 19

Which of the following best explains why water is a good solvent for ionic compounds?

Accepted Answer

Water's polar nature allows it to surround and separate ions.

Question 20

Which of the following is a correct statement about the octet rule?

Accepted Answer

Atoms tend to lose or gain electrons to achieve a full shell of 8 electrons.

General Biology: Foundations of Chemistry, Water, and Life

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