Question 1

Which of the following best describes the Miller-Urey experiment and its significance in biology?

Accepted Answer

It demonstrated that organic molecules could be synthesized abiotically under early Earth conditions.

Question 2

Which of the following is NOT a characteristic shared by all living organisms?

Accepted Answer

Presence of a nucleus

Question 3

Which level of biological organization is immediately above 'cell' in complexity?

Accepted Answer

Tissue

Question 4

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

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

Question 5

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 6

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water is polar, allowing it to surround and separate ions due to its partial charges.

Question 7

Which of the following is a correct description of a dehydration (condensation) reaction?

Accepted Answer

A reaction in which two monomers are joined together by removing a molecule of water.

Question 8

Which of the following is true about the structure of DNA?

Accepted Answer

DNA contains deoxyribose sugar and the bases adenine, thymine, cytosine, and guanine.

Question 9

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 10

Which of the following is a correct pairing of a nucleic acid and its sugar component?

Accepted Answer

RNA and ribose

Question 11

A scientist adds hydrochloric acid ($$HCl) to a $$solution containing water. What happens to the pH of the solution, and why?

Accepted Answer

The pH decreases because $$HCl$$ releases $$H^+$$ ions, increasing the solution's acidity.

Question 12

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

Accepted Answer

It is stabilized by interactions such as hydrogen bonds, ionic bonds, and hydrophobic interactions between side chains.

Question 13

Which of the following is a real-world consequence of ocean acidification?

Accepted Answer

Decreased ability of marine organisms to form calcium carbonate shells

Question 14

Which of the following is a correct description of the quaternary structure of a protein?

Accepted Answer

It involves the interaction of multiple polypeptide chains to form a functional protein.

Question 15

Which of the following is a correct statement about the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 16

Which of the following is a correct statement about the Miller-Urey experiment's setup?

Accepted Answer

It simulated early Earth conditions by using a mixture of gases, water vapor, and electrical sparks.

Question 17

Which of the following is a correct statement about the role of valence electrons in chemical bonding?

Accepted Answer

Valence electrons are involved in forming chemical bonds between atoms.

Question 18

Which of the following is a correct statement about the function of carbohydrates in living organisms?

Accepted Answer

Carbohydrates serve as a primary source of energy and provide structural support.

Question 19

Which of the following is a correct statement about the difference between polar and non-polar covalent bonds?

Accepted Answer

Polar covalent bonds involve unequal sharing of electrons, while non-polar covalent bonds involve equal sharing.

Question 20

Which of the following is a correct statement about the role of buffers in biological systems?

Accepted Answer

Buffers help maintain a stable pH by neutralizing excess acids or bases.

General Biology Study Guide: Chemistry of Life, Biomolecules, and Functional Groups

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