Q: Which equation correctly represents the overall process of photosynthesis?

$$6\mathrm{CO_2$} + 6\mathrm{H_2O} + \text{light energy} \rightarrow \mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$}$$

Question 1

Which of the following best describes the process of natural selection as proposed by Darwin?

Accepted Answer

Individuals with traits best suited to their environment survive and reproduce, passing those traits to offspring.

Question 2

A population of beetles varies in shell thickness. Birds prefer beetles with thinner shells. Over several generations, thick-shelled beetles become more common. Which term best describes this scenario?

Accepted Answer

Directional selection

Question 3

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

Accepted Answer

Modification and sorting of proteins for secretion

Question 4

A cell lacking mitochondria would MOST directly fail at which process?

Accepted Answer

Aerobic respiration

Question 5

Which of the following molecules would most easily cross a lipid membrane unaided?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 6

During cellular respiration, which step produces the most ATP per glucose molecule?

Accepted Answer

Oxidative phosphorylation (electron transport chain)

Question 7

Which equation correctly represents the overall process of photosynthesis?

Accepted Answer

$$6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{light energy} ightarrow \mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$}$$

Question 8

A mutation causes ATP synthase to leak protons. Predict the effect on cellular metabolism.

Accepted Answer

ATP production decreases

Question 9

Which process increases genetic diversity during meiosis?

Accepted Answer

Crossing over between homologous chromosomes

Question 10

A single base-pair substitution in a gene can result in which type of mutation?

Accepted Answer

Missense mutation

Question 11

Which enzyme is responsible for synthesizing new DNA strands during replication?

Accepted Answer

DNA polymerase

Question 12

A pedigree shows a trait affecting both males and females in every generation. What is the most likely inheritance pattern?

Accepted Answer

Autosomal dominant

Question 13

Which of the following best describes the role of restriction enzymes in DNA profiling?

Accepted Answer

They cut DNA at specific sequences, generating fragments for analysis.

Question 14

In a graph showing the effect of fertilizer on plant growth, the independent variable is:

Accepted Answer

Amount of fertilizer

Question 15

Which of the following would most likely result from a mutation in the promoter region of a gene?

Accepted Answer

Altered gene expression levels

Question 16

Which process is directly responsible for the production of gametes in animals?

Accepted Answer

Meiosis

Question 17

Which of the following best explains why sickle-cell allele is maintained in some populations?

Accepted Answer

Heterozygote advantage in regions with malaria

Question 18

Which of the following is a real-world application of PCR (polymerase chain reaction)?

Accepted Answer

Amplifying small amounts of DNA for forensic analysis

Question 19

Which statement about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of chemical reactions.

Question 20

A mutation in a gene results in a nonfunctional protein. Which term best describes this mutation?

Accepted Answer

Loss-of-function mutation

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