Question 1

Which of the following correctly lists the hierarchy of biological organization from the simplest to the most complex?

Accepted Answer

Atom, molecule, cell, tissue, organ, organ system, organism

Question 2

A scientist is studying a newly discovered organism. It is multicellular, has cell walls made of cellulose, and performs photosynthesis. To which kingdom does this organism most likely belong?

Accepted Answer

Plantae

Question 3

Which of the following statements best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Prokaryotic cells lack a nucleus and membrane-bound organelles, while eukaryotic cells have both.

Question 4

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

The oxygen atom is more electronegative than the hydrogen atoms, creating a partial negative charge near the oxygen and a partial positive charge near the hydrogens.

Question 5

A solution has a hydrogen ion concentration of $$[H^+] = 1 	imes 10$$^{-5}$$ M. What is the pH of this solution?

Accepted Answer

$$pH = 5$$

Question 6

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 7

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms.

Question 8

A buffer solution is important in biological systems because it:

Accepted Answer

Maintains a relatively constant pH by accepting or donating hydrogen ions.

Question 9

Which of the following functional groups is correctly matched with its chemical property?

Accepted Answer

Hydroxyl group ($$-OH$$): polar

Question 10

Which of the following best explains why hydrocarbons are hydrophobic?

Accepted Answer

They are composed mostly of nonpolar carbon-hydrogen bonds, which do not interact favorably with water.

Question 11

A scientist dissolves table salt ($$NaCl) in $$water. Which property of water allows it to dissolve ionic compounds like $$NaCl$$?

Accepted Answer

Water's ability to form hydrogen bonds with ions

Question 12

Which of the following statements about electron shells and orbitals is correct?

Accepted Answer

Each orbital can hold a maximum of 2 electrons.

Question 13

Which of the following best describes the difference between qualitative and quantitative data?

Accepted Answer

Qualitative data is descriptive and non-numerical, while quantitative data is numerical and measurable.

Question 14

Which of the following is an example of a strong acid?

Accepted Answer

Hydrochloric acid ($$HCl)$$

Question 15

If the $$[OH^-]$$ concentration in a solution is $$1 	imes 10$$^{-9}$$ M, what is the $$[H^+]$$ concentration?

Accepted Answer

Question 16

Which of the following best explains why carbon is so important in living organisms?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a diversity of stable organic molecules.

Question 17

Which of the following is a correct statement about hydrogen bonds?

Accepted Answer

Hydrogen bonds occur between a hydrogen atom covalently bonded to an electronegative atom and another electronegative atom.

Question 18

A molecule has the formula $$C_6H_{12}O_6$. Which class of biological macromolecules does it most likely belong to?

Accepted Answer

Carbohydrate

Question 19

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation has lost electrons and is positively charged, while an anion has gained electrons and is negatively charged.

General Biology: Foundational Concepts and Chemical Principles

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