Question 1

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

Accepted Answer

Water is a polar molecule, so its partial charges can interact with and stabilize both cations and anions.

Question 2

A patient is given an intravenous solution that is hypertonic relative to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

The cells will shrink as water moves out of them into the surrounding solution.

Question 3

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy, allowing reactions to proceed more rapidly.

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 DNA sample is found to contain 30% adenine. According to Chargaff's Rule, what percentage of guanine should be present?

Accepted Answer

$$20\%$$

Question 6

Which of the following best explains why the genetic code is described as 'degenerate'?

Accepted Answer

Multiple codons can specify the same amino acid.

Question 7

During cellular respiration, which process produces the most ATP?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 8

Which of the following is a correct description of the role of Rubisco in photosynthesis?

Accepted Answer

It fixes carbon dioxide by catalyzing the reaction with ribulose bisphosphate in the Calvin cycle.

Question 9

A mutation changes a codon from $$UAC to$$ $$UAA. $$What type of mutation is this, and what is its likely effect?

Accepted Answer

Nonsense mutation; introduces a premature stop codon.

Question 10

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

Accepted Answer

tRNA brings specific amino acids to the ribosome based on codon-anticodon pairing.

Question 11

Which of the following scenarios best illustrates the concept of allosteric regulation of an enzyme?

Accepted Answer

A molecule binds to a site other than the active site, changing the enzyme's shape and activity.

Question 12

Which of the following is true regarding the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have DNA in a nucleus, while prokaryotic cells have DNA in the cytoplasm.

Question 13

Which of the following best describes the effect of a competitive inhibitor on enzyme activity?

Accepted Answer

It binds to the active site, preventing substrate binding and increasing $$K_m.$$

Question 14

Which of the following is a function of the smooth endoplasmic reticulum (ER) in eukaryotic cells?

Accepted Answer

Lipid synthesis and detoxification of drugs

Question 15

Which of the following best explains why phospholipids form bilayers in aqueous environments?

Accepted Answer

Their hydrophilic heads interact with water, while hydrophobic tails avoid water.

Question 16

Which of the following best describes the outcome of meiosis in humans?

Accepted Answer

Four genetically unique haploid cells

Question 17

Which of the following is a real-world example of a codominant inheritance pattern?

Accepted Answer

ABO blood group system, where both A and B alleles are expressed in type AB individuals.

Question 18

Which of the following best describes the function of the sodium-potassium pump in animal cells?

Accepted Answer

It uses ATP to move sodium out of the cell and potassium into the cell, maintaining electrochemical gradients.

Question 19

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP hydrolysis releases energy that can be used to drive endergonic reactions.

General Biology I Final Exam Comprehensive Study Guide

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