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Review Biology related questions and content

Which function does the cellular membrane perform?

  • A. Separates the living contents of the cell from the nonliving surrounding environment.
  • B. Stores substances such as water, sugars, salts, and toxic materials.
  • C. Separates the nucleus from the cytoplasm.
  • D. Specializes in converting energy to a form that can be used by a cell.
Correct Answer: A

Rationale: The correct answer is A. The cellular membrane performs the function of separating the living contents of the cell from the nonliving surrounding environment. This separation is crucial for maintaining the internal environment of the cell and regulating what enters and exits the cell. Choice B is incorrect because storing substances is not the primary function of the cellular membrane. Choice C is incorrect because the nuclear membrane, not the cellular membrane, separates the nucleus from the cytoplasm. Choice D is incorrect because the conversion of energy is primarily the role of organelles like mitochondria, not the cellular membrane. Thus, the correct answer is A as it accurately describes the fundamental function of the cellular membrane.

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Why is homeostasis necessary?

  • A. To maintain temperature
  • B. To maintain pH
  • C. To maintain glucose levels
  • D. All of the above
Correct Answer: D

Rationale: Homeostasis is essential for the body to maintain internal balance and ensure optimal functioning. It is responsible for regulating temperature to prevent overheating or cooling, controlling pH levels to support biochemical reactions, and managing glucose levels for energy production. Therefore, all the options - maintaining temperature, pH, and glucose levels - are crucial functions of homeostasis.

What is the function of water in photosynthesis?

  • A. Combine with carbon dioxide
  • B. Absorb light energy
  • C. Supply electrons in the light reactions
  • D. Transport hydrogen ions in the dark reactions
Correct Answer: C

Rationale: Water plays a crucial role in photosynthesis by supplying electrons in the light reactions of the process. During the light reactions of photosynthesis, water molecules are split, releasing oxygen and providing electrons that are used to drive the production of energy-rich molecules like ATP and NADPH. This electron transfer process is essential for converting light energy into chemical energy, which is then used in the subsequent steps of photosynthesis to produce glucose and other organic compounds.

Which of the following nucleotides is not a component of DNA?

  • A. Adenine
  • B. Thymine
  • C. Uracil
  • D. Cytosine
Correct Answer: C

Rationale: The four nucleotides that make up DNA are Adenine, Thymine, Cytosine, and Guanine. Uracil is a nucleotide base that is present in RNA but not in DNA. Therefore, Uracil is the correct answer as it is not a component of DNA.

What type of tissue is fat composed of?

  • A. Connective
  • B. Muscle
  • C. Nervous
  • D. Epithelial
Correct Answer: A

Rationale: The correct answer is A: Connective tissue. Fat tissue, also known as adipose tissue, is a type of connective tissue that stores energy in the form of fat. It provides insulation and serves as a reserve of energy. Muscle tissue (choice B) is responsible for movement, nervous tissue (choice C) transmits electrical signals throughout the body, and epithelial tissue (choice D) covers and protects body surfaces.

A scientist needs 12 mL of a solution. They have a bottle with 0.12L in it. Do they have enough?

  • A. Yes, they have exactly what they need
  • B. Yes, they have more than what they need
  • C. No, they do not have enough
  • D. None of the above
Correct Answer: B

Rationale: To accurately compare the quantities, it is important to convert both to the same unit. As 1L is equal to 1000 mL, the bottle contains 120 mL (0.12L x 1000 mL/L). Since the scientist only needs 12 mL, it is evident that they have more than enough solution in the bottle, making choice B the correct answer.

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