Question 1

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

Accepted Answer

Mitosis results in genetically identical cells, while meiosis increases genetic variation through crossing over and independent assortment.

Question 2

A human cell with 46 chromosomes undergoes meiosis. How many chromosomes will each resulting gamete contain?

Accepted Answer

$$23$$

Question 3

Which phase of mitosis is characterized by the alignment of chromosomes along the metaphase plate?

Accepted Answer

Metaphase

Question 4

In a pedigree, a trait that appears in every generation is most likely:

Accepted Answer

Dominant

Question 5

Which of the following best explains why crossing over during meiosis is important for evolution?

Accepted Answer

It increases genetic diversity in offspring.

Question 6

A heterozygous individual for a single gene cross ($$Aa) is $$crossed with a homozygous recessive individual ($$aa). $$What is the expected phenotypic ratio of the offspring?

Accepted Answer

$$1:1$$

Question 7

Which of the following is a function of the human pancreas?

Accepted Answer

To secrete insulin and glucagon to regulate blood sugar levels.

Question 8

Which structure in the heart is responsible for preventing the backflow of blood from the ventricle to the atrium?

Accepted Answer

Atrioventricular (AV) valve

Question 9

Which of the following best describes the role of ribosomes in a cell?

Accepted Answer

They synthesize proteins using mRNA as a template.

Question 10

A patient is diagnosed with sickle cell anemia, a disease caused by a mutation in the hemoglobin gene. Which type of mutation is most likely responsible?

Accepted Answer

A point mutation

Question 11

Which of the following is a correct sequence of events in embryonic development?

Accepted Answer

Fertilization $$\rightarrow$$ Cleavage $$\rightarrow$$ Gastrulation $$\rightarrow$$ Organogenesis

Question 12

Which of the following best describes the function of the contractile vacuole in protists such as Paramecium?

Accepted Answer

It expels excess water to maintain osmotic balance.

Question 13

Which of the following is a key difference between arteries and veins?

Accepted Answer

Arteries carry blood away from the heart; veins carry blood toward the heart.

Question 14

Which process is responsible for the independent assortment of genes during gamete formation?

Accepted Answer

Metaphase I of meiosis

Question 15

Which of the following best explains why antibiotics are ineffective against viral infections?

Accepted Answer

Viruses lack the cellular structures targeted by antibiotics.

Question 16

A genetic cross between two heterozygous individuals ($$Aa 	imes Aa) $$results in what genotypic ratio among the offspring?

Accepted Answer

$$1:2:1$$

Question 17

Which of the following is a function of the large intestine in humans?

Accepted Answer

Absorption of water and formation of feces.

Question 18

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

Accepted Answer

It brings amino acids to the ribosome according to the mRNA codon sequence.

Question 19

Which of the following is an example of a vestigial structure in humans?

Accepted Answer

The appendix

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