Biology HESI A2 Practice Test

Questions 49

HESI A2

HESI A2 Test Bank

Biology HESI A2 Practice Test Questions

Question 1 of 5

The mixture of gases surrounding a planet is referred to as its ______.

Correct Answer: A

Rationale: The correct answer is A: Atmosphere. The atmosphere is the layer of gases that surrounds a planet. It consists of different layers, including the stratosphere and troposphere mentioned in the other choices. The biosphere refers to the regions on Earth where living organisms exist, not the gases surrounding the planet. Therefore, the correct term for the mixture of gases surrounding a planet is the atmosphere.

Question 2 of 5

Muscles are connected to bones by ______, and bones are connected to each other by ______.

Correct Answer: B

Rationale: The correct answer is B: Tendons, ligaments. Tendons connect muscles to bones, enabling movement. Ligaments connect bones to each other, providing stability. Muscles and ligaments are not directly involved in connecting muscles to bones. Therefore, option B is the most appropriate choice.

Question 3 of 5

Which of the following is always true about molecules?

Correct Answer: C

Rationale: The correct answer is C because molecules move from areas of high concentration to low concentration through a process called passive diffusion, which does not require energy. This movement occurs to reach equilibrium. Choice A is incorrect as some molecules can pass through cell membranes using channels or transporters. Choice B is incorrect because molecules move from high to low concentration in passive transport. Choice D is incorrect because molecules are constantly moving due to various forces.

Question 4 of 5

DNA bases include all but which of the following?

Correct Answer: C

Rationale: The correct answer is C: Uracil. DNA bases consist of Adenine, Thymine, Cytosine, and Guanine, whereas Uracil is only found in RNA. DNA uses Thymine, while RNA uses Uracil as one of its bases. Therefore, Uracil is not a part of DNA bases. Adenine, Thymine, and Cytosine are all essential components of DNA.

Question 5 of 5

The fur color in a population of dogs is controlled by two alleles: black (B) and tan (b). The black allele exhibits complete dominance. If the phenotype of the dog is tan fur, what is its genotype?

Correct Answer: C

Rationale: The correct answer is C (bb) because tan fur is the recessive phenotype controlled by the tan allele (b). Since the black allele (B) exhibits complete dominance, a dog must have two copies of the tan allele (bb) to have a tan fur phenotype. Choice A (BB) and B (Bb) would result in black fur, not tan. Choice D (Not enough information) is incorrect as the question provides enough information to determine the correct genotype based on the phenotype given.

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