Biology

Biology Related

Review Biology related questions and content

What term best describes the sum of all an organism's chemical processes?

  • A. Respiration.
  • B. Anabolism.
  • C. Metabolism.
  • D. Differentiation.
Correct Answer: C

Rationale: The correct answer is C: Metabolism. Metabolism refers to the sum of all chemical processes in an organism to maintain life. It includes both anabolism (building up molecules) and catabolism (breaking down molecules). Respiration (A) is a specific part of metabolism involving the breakdown of glucose to produce energy. Anabolism (B) is the process of building complex molecules from simpler ones. Differentiation (D) is the process in which cells become specialized for specific functions, not related to the sum of all chemical processes in an organism. Therefore, metabolism is the most appropriate term to describe the overall chemical processes in an organism.

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What type of bond in the base of the DNA nucleotides holds the strands together?

  • A. Hydrogen.
  • B. Sodium chloride.
  • C. Copper.
  • D. Potassium bromide.
Correct Answer: A

Rationale:

Of all the molecules that are significant to biology, which of the following are considered the most important?

  • A. Carbohydrates, lipids, protein, and nucleic acids
  • B. Carbohydrates, lipids, protein, and calcium
  • C. Carbohydrates, lipids, protein, and sulfur
  • D. Carbohydrates, lipids, protein, and iron
Correct Answer: A

Rationale: The correct answer is A: Carbohydrates, lipids, proteins, and nucleic acids are considered the most important molecules in biology. Carbohydrates are essential for energy production, lipids play a role in energy storage and cell membrane structure, proteins are involved in various cellular functions, and nucleic acids carry genetic information. While calcium, sulfur, and iron are important elements in biology, they are not considered as primary biological molecules compared to carbohydrates, lipids, proteins, and nucleic acids.

Which of the following cell parts are present in plant cells but not animal cells (there may be more than one answer):

  • A. Cell membrane
  • B. Cell wall
  • C. Ribosome
  • D. Chloroplast
Correct Answer: D

Rationale: The correct answer is 'D - Chloroplast' because it is a unique cell part found only in plant cells and is responsible for photosynthesis. Animal cells do not possess chloroplasts. Both plant and animal cells have cell membranes, which are essential for cellular function. The cell wall is a structural component specific to plant cells, providing support and protection. Ribosomes, responsible for protein synthesis, are organelles present in both plant and animal cells.

Anaerobic respiration happens in.............because..............

  • A. Animals; they primarily rely on aerobic respiration
  • B. Plants; they can perform photosynthesis
  • C. Bacteria; they live in environments with low oxygen levels
  • D. None of the above
Correct Answer: C

Rationale: Anaerobic respiration occurs in bacteria because they live in environments with low oxygen levels. In the absence of oxygen, these organisms utilize anaerobic respiration to generate energy. Animals and plants primarily rely on aerobic respiration, which requires oxygen to produce energy efficiently. Plants do not lack sunlight; they can perform photosynthesis to derive energy. Animals do require energy but predominantly use aerobic respiration when oxygen is available.

Which cellular appendage enables cells to move through their environments?

  • A. Cell membrane.
  • B. Receptor.
  • C. Flagellum.
  • D. Transport protein.
Correct Answer: C

Rationale:

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