Question 1

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

Accepted Answer

Because the oxygen atom is more electronegative, creating a partial negative charge near the oxygen and a partial positive charge near the hydrogens.

Question 2

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 3

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

Accepted Answer

Amino group ($$-NH_2$)

Question 4

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

Accepted Answer

Unsaturated fatty acids have one or more double bonds, causing kinks in the hydrocarbon chain.

Question 5

A patient is diagnosed with a genetic disorder caused by a mutation in the gene encoding an enzyme responsible for breaking down glycogen. Which macromolecule is directly affected by this mutation?

Accepted Answer

Carbohydrate

Question 6

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy, increasing the rate of chemical reactions.

Question 7

Which process best explains how oxygen moves across the plasma membrane of a cell?

Accepted Answer

Simple diffusion down its concentration gradient

Question 8

During aerobic cellular respiration, what is the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$O_2)$$

Question 9

Which of the following best describes the role of tRNA during translation?

Accepted Answer

tRNA carries amino acids to the ribosome and matches its anticodon with the codon on mRNA.

Question 10

A mutation changes a codon from UAU to UAA in the coding region of a gene. What is the most likely effect on the resulting protein?

Accepted Answer

Translation will terminate prematurely, resulting in a truncated protein.

Question 11

Which of the following is a property of water that allows it to moderate Earth's climate?

Accepted Answer

High heat of vaporization

Question 12

Which of the following best explains why carbon is considered the 'backbone' of organic molecules?

Accepted Answer

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

Question 13

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

Accepted Answer

Eukaryotic cells have a nucleus, while prokaryotic cells lack a nucleus.

Question 14

Which phase of mitosis is characterized by the alignment of chromosomes along the center of the cell?

Accepted Answer

Metaphase

Question 15

Which of the following is true regarding the process of osmosis?

Accepted Answer

Osmosis is the movement of water from a region of low solute concentration to high solute concentration across a selectively permeable membrane.

Question 16

Which of the following best describes the function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Modifying, sorting, and packaging proteins for secretion or delivery to other organelles

Question 17

Which of the following is a correct statement about redox reactions in cellular respiration?

Accepted Answer

Reduction is the gain of electrons, and oxidation is the loss of electrons.

Question 18

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

Enzymes have active sites with unique shapes that only fit specific substrates.

Question 19

Which of the following is a direct product of glycolysis?

Accepted Answer

Pyruvate

Question 20

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

Accepted Answer

Buffers maintain a stable pH by donating or accepting hydrogen ions ($$H^+) $$when acids or bases are added.

General Biology I: Comprehensive Study Guide (Final Exam Preparation)

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