Question 1

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, resulting in charged ions, while covalent bonds involve the sharing of electrons between atoms.

Question 2

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-5}$$ M. What is its pH?

Accepted Answer

$$5$$

Question 3

Which of the following statements about the laws of thermodynamics is correct in the context of cellular respiration?

Accepted Answer

The second law states that every energy transfer increases the entropy of the universe, which is observed as heat loss during cellular respiration.

Question 4

During which stage of cellular respiration is the majority of ATP produced, and what is the main process responsible?

Accepted Answer

Oxidative phosphorylation; chemiosmosis

Question 5

Which of the following correctly matches the reactants and products of the light-dependent reactions of photosynthesis?

Accepted Answer

Reactants: $$H_2O$$, NADP+, ADP; Products: $$O_2$$, NADPH, ATP

Question 6

A mutation causes a cell to skip the G1 checkpoint in the cell cycle. Which of the following is a likely consequence?

Accepted Answer

The cell may proceed to S phase with damaged DNA, increasing the risk of cancer.

Question 7

Which of the following best describes the difference between the leading and lagging strands during DNA replication?

Accepted Answer

The leading strand is synthesized continuously in the 5' to 3' direction, while the lagging strand is synthesized discontinuously as Okazaki fragments.

Question 8

Which of the following is true regarding mRNA splicing in eukaryotic cells?

Accepted Answer

Splicing removes introns and joins exons to form mature mRNA.

Question 9

A patient has a genetic disorder caused by a mutation in a histone protein. Which of the following processes is most likely to be directly affected?

Accepted Answer

The ability of DNA to be packaged into nucleosomes and chromatin.

Question 10

Which of the following best explains why the structure of a protein is important for its function?

Accepted Answer

The tertiary structure creates a specific three-dimensional shape that allows the protein to interact with other molecules.

Question 11

A researcher is studying a gene with codominant alleles for flower color: allele R (red) and allele W (white). What phenotype would be expected in a plant with genotype RW?

Accepted Answer

Flowers with both red and white patches

Question 12

In a dihybrid cross between BbRR and bbRr, what is the probability of obtaining an offspring with genotype BbRr?

Accepted Answer

$$\frac{1}{4}$$

Question 13

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

Accepted Answer

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

Question 14

A woman who is heterozygous for an X-linked recessive disorder (X$$^NX$^n) $$and a man who is unaffected (X$$^NY) $$have a son. What is the probability that their son will have the disorder?

Accepted Answer

$$\frac{1}{2}$$

Question 15

Which of the following scenarios best illustrates the concept of linkage in genetics?

Accepted Answer

Two genes located close together on the same chromosome tend to be inherited together.

Question 16

Which of the following best describes the role of the lac operon in E. coli?

Accepted Answer

It regulates the breakdown of lactose in response to the presence or absence of lactose and glucose.

Question 17

A cell is observed to have chromosomes aligned at the center of the cell, with spindle fibers attached to the centromeres. Which stage of mitosis is this?

Accepted Answer

Metaphase

Question 18

Which of the following is a direct result of chromosome crossover during meiosis?

Accepted Answer

Increased genetic variation in gametes

Question 19

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

Accepted Answer

ATP contains high-energy phosphate bonds that, when hydrolyzed, release energy for cellular processes.

Question 20

A scientist is analyzing a karyotype and observes an extra chromosome 21. What condition does this indicate, and what is the likely cause?

Accepted Answer

Down syndrome; nondisjunction during meiosis

General Biology Final Exam Study Guide: Key Concepts and Processes

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