Question 1

Which of the following best describes the difference between a hypothesis and a scientific theory?

Accepted Answer

A hypothesis is a tentative explanation that can be tested, while a theory is a well-substantiated explanation supported by a large body of evidence.

Question 2

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Eukaryotic cells contain their DNA within a membrane-bound nucleus, while prokaryotic cells have their DNA in the cytoplasm.

Question 3

A neutral atom of carbon has 6 protons, 6 neutrons, and 6 electrons. If the atom gains an extra electron, what is its new electrical charge?

Accepted Answer

$$-1$$

Question 4

Which of the following best explains why water is an excellent solvent for ionic and polar substances?

Accepted Answer

Water molecules are polar, allowing them to surround and interact with charged and polar molecules.

Question 5

Which property of carbon allows it to form large, complex molecules with diverse shapes and functions?

Accepted Answer

Carbon can form four covalent bonds, allowing for branching and ring structures.

Question 6

A scientist is studying a protein and finds that it consists of two polypeptide chains. Which level of protein structure is directly described by this observation?

Accepted Answer

Quaternary structure

Question 7

During cellular respiration, which of the following correctly matches the stage with its main location in a eukaryotic cell?

Accepted Answer

Oxidative phosphorylation – inner mitochondrial membrane

Question 8

Which of the following best explains why cells are limited in size by their surface area-to-volume ratio?

Accepted Answer

As a cell grows, its volume increases faster than its surface area, making it difficult to efficiently exchange materials with the environment.

Question 9

A red blood cell is placed in a solution and swells until it bursts. Which of the following best describes the solution?

Accepted Answer

The solution is hypotonic to the cell.

Question 10

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in the bonds between its phosphate groups, which are unstable and release energy when broken.

Question 11

A DNA template strand has the sequence $$5'	ext{-}ATGCGT-3'. $$What is the corresponding mRNA sequence produced during transcription?

Accepted Answer

$$5'	ext{-}AUGCGU-3'$$

Question 12

Which of the following best describes a frameshift mutation and its likely effect?

Accepted Answer

A frameshift mutation is caused by the insertion or deletion of nucleotides, altering the reading frame and often resulting in a nonfunctional protein.

Question 13

In a dihybrid cross between two heterozygous pea plants ($$RrYy 	imes RrYy$$), what is the probability of obtaining an offspring with the genotype $$rryy$$?

Accepted Answer

$$\dfrac{1}{16}$$

Question 14

Which of the following mechanisms does NOT contribute to genetic variation in sexually reproducing organisms?

Accepted Answer

Replication of DNA during S phase

Question 15

A woman with blood type AB and a man with blood type O have a child. What are the possible blood types of their child?

Accepted Answer

A or B

Question 16

Which of the following statements about X-linked recessive inheritance is correct?

Accepted Answer

A son can inherit an X-linked recessive disorder if his mother is a carrier.

Question 17

Which of the following best describes the role of the promoter in transcription?

Accepted Answer

The promoter is the region of DNA where RNA polymerase binds to initiate transcription.

Question 18

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

Accepted Answer

Phospholipids have both hydrophilic heads and hydrophobic tails, causing them to arrange into bilayers with tails inward and heads outward.

Question 19

Which of the following is a correct statement about the law of independent assortment?

Accepted Answer

It states that each pair of alleles segregates independently of other pairs during gamete formation.

Question 20

Which of the following best describes the difference between exergonic and endergonic reactions?

Accepted Answer

Exergonic reactions release free energy and increase entropy, while endergonic reactions require energy input and decrease entropy.

Comprehensive Study Guide: Foundations of Biology (Final Exam Review)

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