Question 1

Which of the following best describes the difference between dehydration synthesis and hydrolysis reactions in biological systems?

Accepted Answer

Dehydration synthesis joins two molecules by removing a water molecule, while hydrolysis breaks a molecule into two by adding a water molecule.

Question 2

A mutation changes a DNA sequence from $$ 	ext{TAC}  to$$ $$ 	ext{TAG} . $$What type of mutation is this, and what is a possible effect on the resulting protein?

Accepted Answer

This is a point mutation, which may result in a premature stop codon and a truncated protein.

Question 3

Which of the following best explains why saturated fatty acids are solid at room temperature while unsaturated fatty acids are liquid?

Accepted Answer

Saturated fatty acids have no double bonds, allowing them to pack tightly together, while unsaturated fatty acids have one or more double bonds causing kinks that prevent tight packing.

Question 4

Which scientist(s) provided evidence that DNA, not protein, is the genetic material by using radioactive labeling in bacteriophages?

Accepted Answer

Alfred Hershey and Martha Chase

Question 5

A red blood cell is placed in a hypertonic solution. What will happen to the cell, and why?

Accepted Answer

Water will move out of the cell, causing it to shrink, because the solution has a higher solute concentration than the cell.

Question 6

Which of the following organelles is responsible for producing ATP through cellular respiration, and what evidence supports the endosymbiotic theory for its origin?

Accepted Answer

Mitochondrion; it contains its own circular DNA and double membrane similar to prokaryotes.

Question 7

Given the DNA sequence $$ 5'	ext{-ATG CCG TAA-}3' $$, what is the complementary DNA strand?

Accepted Answer

$$3'	ext{-TAC GGC ATT-}5'$$

Question 8

Which of the following best describes the flow of electrons during the light reactions of photosynthesis?

Accepted Answer

Electrons are donated by water, move through photosystems II and I, and are ultimately accepted by NADP$$ ^+  to $$form NADPH.

Question 9

Which of the following is true regarding the Hardy-Weinberg equilibrium equation $$p^2 + 2pq$$ + $$q^2 = 1$?

Accepted Answer

$$p^2$$ represents the frequency of the homozygous dominant genotype.

Question 10

Which of the following best describes the role of the sodium-potassium pump in neurons during an action potential?

Accepted Answer

It restores the resting membrane potential by moving 3 Na$$ ^+ $$ ions out and 2 K$$ ^+ $$ ions in, using ATP.

Question 11

Which of the following best describes the difference between passive and active transport across a cell membrane?

Accepted Answer

Passive transport moves substances down their concentration gradient without energy input, while active transport moves substances against their gradient using energy.

Question 12

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

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

Question 13

Which of the following best describes the difference between exons and introns in eukaryotic gene expression?

Accepted Answer

Exons are coding sequences that remain in mature mRNA, while introns are non-coding sequences removed during splicing.

Question 14

Which of the following best explains why the equator is generally warmer than the poles?

Accepted Answer

The equator receives more direct sunlight year-round due to the Earth's curvature.

Question 15

Which of the following best describes the role of ATP synthase in cellular respiration?

Accepted Answer

It synthesizes ATP as protons flow down their gradient from the intermembrane space to the mitochondrial matrix.

Question 16

Which of the following is the correct order of blood flow through the heart and lungs?

Accepted Answer

Right atrium → right ventricle → pulmonary artery → lungs → pulmonary vein → left atrium → left ventricle → aorta

Question 17

Which of the following best describes the difference between mitosis and meiosis?

Accepted Answer

Mitosis produces two genetically identical diploid cells, while meiosis produces four genetically unique haploid cells.

Question 18

Which of the following best describes the function of antibodies in the immune system?

Accepted Answer

They bind to specific antigens to help neutralize or mark pathogens for destruction.

Question 19

Which of the following vitamins is fat-soluble and plays a key role in blood clotting?

Accepted Answer

Vitamin K

Comprehensive Biology Final Exam Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards