Q: During the light reactions of photosynthesis, which of the following best describes the fate of electrons originally derived from water?

They are transferred to NADP\textsuperscript{+}, forming NADPH.

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

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + \text{light energy} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2$$

Question 1

During the light reactions of photosynthesis, which of the following best describes the fate of electrons originally derived from water?

Accepted Answer

They are transferred to NADP	extsuperscript{+}, forming NADPH.

Question 2

A scientist exposes a plant to only green light. Which of the following outcomes is most likely, and why?

Accepted Answer

Photosynthesis rate will decrease because chlorophyll reflects green light.

Question 3

Which equation correctly represents the overall process of photosynthesis?

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 	ext{light energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2$$

Question 4

A patient is diagnosed with a genetic disorder caused by nondisjunction during meiosis. Which of the following best explains the cellular event that led to this condition?

Accepted Answer

Homologous chromosomes failed to separate during meiosis I.

Question 5

Which of the following best describes the difference between mitosis and meiosis in terms of genetic variation?

Accepted Answer

Meiosis increases genetic variation through crossing over and independent assortment; mitosis does not.

Question 6

A woman who is heterozygous for sickle-cell disease (an autosomal recessive disorder) has a child with a man who is also heterozygous. What is the probability that their child will have sickle-cell disease?

Accepted Answer

$$\dfrac{1}{4}$$

Question 7

Which of the following scenarios best illustrates codominance?

Accepted Answer

A person with type AB blood expresses both A and B antigens equally.

Question 8

Which of the following best explains why mutations are the ultimate source of genetic variation in populations?

Accepted Answer

Mutations create new alleles that did not previously exist.

Question 9

A population of bacteria is exposed to an antibiotic. After several generations, most bacteria are resistant. Which evolutionary mechanism best explains this observation?

Accepted Answer

Natural selection favors bacteria with resistance genes.

Question 10

Which of the following best describes the process of DNA replication?

Accepted Answer

Each new DNA molecule consists of one old strand and one new strand (semi-conservative).

Question 11

A mutation changes a DNA codon from $$\mathrm{GAA} to$$ $$\mathrm{GAG}$$, but both code for glutamic acid. What type of mutation is this?

Accepted Answer

Silent mutation

Question 12

Which of the following best explains why small populations are more susceptible to genetic drift?

Accepted Answer

Random changes in allele frequencies have a larger effect in small populations.

Question 13

Which of the following is a direct input to the Calvin cycle during photosynthesis?

Accepted Answer

$$\mathrm{CO}_2$$

Question 14

Which of the following best describes the role of ATP synthase in the chloroplast?

Accepted Answer

It produces ATP using the energy from a proton gradient.

Question 15

A researcher observes that a population of birds has shifted to having longer beaks over several generations. Which type of natural selection is most likely responsible?

Accepted Answer

Directional selection

Question 16

Which of the following best describes the relationship between homologous structures in different species?

Accepted Answer

They indicate common ancestry due to similar underlying anatomy.

Question 17

Which of the following is a real-world example of the founder effect?

Accepted Answer

A small group of finches colonizes a new island, leading to unique traits in the new population.

Question 18

Which of the following best explains why fertilizer runoff into lakes often causes eutrophication?

Accepted Answer

Excess nutrients promote algal blooms, which deplete oxygen when they decompose.

Question 19

Which of the following best describes the main focus of ecosystem studies in ecology?

Accepted Answer

Energy flow and nutrient cycling among organisms and their environment.

Question 20

Which of the following correctly matches a biome with its characteristic climate?

Accepted Answer

Tundra: permafrost and short growing season

Comprehensive Study Notes: Photosynthesis, Cell Division, Genetics, DNA & Gene Expression, Evolution, and Ecology

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