Question 1

Which of the following best describes the role of Rubisco in the Calvin cycle?

Accepted Answer

Rubisco catalyzes the fixation of carbon dioxide to ribulose bisphosphate (RuBP), forming 3-phosphoglycerate.

Question 2

A plant cell is exposed to light of wavelength 700 nm. Which pigment is most likely to absorb this light, and what is the significance for photosynthesis?

Accepted Answer

Chlorophyll a; it is the special pair in Photosystem I that absorbs light at 700 nm, enabling electron transfer.

Question 3

During mitosis, which event ensures that each daughter cell receives an identical set of chromosomes?

Accepted Answer

The alignment of chromosomes at the metaphase plate and their separation by the mitotic spindle during anaphase.

Question 4

Which checkpoint in the cell cycle is most likely to prevent a cell with damaged DNA from entering mitosis?

Accepted Answer

G2 checkpoint

Question 5

A cell with 2n = 46 chromosomes undergoes meiosis. How many chromosomes will each gamete contain after meiosis is complete?

Accepted Answer

Each gamete will contain 23 chromosomes.

Question 6

Which of the following best explains the genetic variation observed in offspring produced by sexual reproduction?

Accepted Answer

Crossing over during prophase I, independent assortment during metaphase I, and random fertilization.

Question 7

In a dihybrid cross between two heterozygous pea plants (AaBb x AaBb), what is the expected phenotypic ratio according to Mendel's law of independent assortment?

Accepted Answer

9:3:3:1

Question 8

A woman who is a carrier for an X-linked recessive disorder (genotype X$$^AX$^a) $$and a man who is not affected (genotype X$$^AY) $$have a child. What is the probability that their son will have the disorder?

Accepted Answer

50%

Question 9

Which of the following mutations is most likely to result in Down Syndrome?

Accepted Answer

Trisomy of chromosome 21

Question 10

Which process in photosynthesis is directly responsible for the production of ATP?

Accepted Answer

Linear electron flow through the thylakoid membrane, creating a proton gradient for ATP synthase

Question 11

A cell is observed to have a contractile ring forming at its equator. Which process is occurring, and what is the outcome?

Accepted Answer

Cytokinesis in animal cells; the cell will split into two daughter cells.

Question 12

Which of the following best describes the difference between somatic cells and gametes?

Accepted Answer

Somatic cells are diploid and make up the body tissues, while gametes are haploid and involved in reproduction.

Question 13

Which of the following is a consequence of nondisjunction during meiosis?

Accepted Answer

Production of gametes with abnormal chromosome numbers, leading to conditions such as trisomy or monosomy.

Question 14

Which enzyme is responsible for the condensation of chromosomes during prophase?

Accepted Answer

Histone proteins

Question 15

A cell is exposed to a mutagen that causes a deletion mutation on chromosome 5. Which of the following best describes the potential outcome?

Accepted Answer

The cell may lose essential genes, potentially resulting in genetic disorders or lethality.

Question 16

Which of the following best explains why cancer cells can form tumors?

Accepted Answer

Cancer cells have increased angiogenesis and can evade cell cycle checkpoints, leading to uncontrolled cell division.

Question 17

In the context of Mendel's experiments, what is the significance of the F$$_2$$ generation?

Accepted Answer

It reveals the segregation of alleles and the reappearance of recessive traits.

Question 18

Which of the following best describes the function of the stomata in plant leaves?

Accepted Answer

Stomata facilitate gas exchange, allowing CO$$_2 to $$enter and O$$_2 to $$exit.

Question 19

A fruit fly (Drosophila melanogaster) with genotype X$$^AX$^a is $$crossed with a male X$$^aY. $$What is the expected proportion of female offspring with the disorder if the disorder is X-linked recessive?

Accepted Answer

50%

Comprehensive Study Notes: Photosynthesis, Cell Division, Meiosis, and Mendelian Genetics

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