Biology

Biology Related

Review Biology related questions and content

Among all the molecules 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, protein, and nucleic acids. These four types of molecules are crucial to biological systems. Carbohydrates provide energy and structural support, lipids serve as energy storage and cell membrane components, proteins have diverse functions in cells, and nucleic acids carry genetic information. While the other choices may have biological importance, nucleic acids play a fundamental role in storing and transmitting genetic information, making them essential in the context of biology.

You may also like to solve these questions

A plant cell is placed in a solution and it shrinks from water loss. In what type of environment was the cell placed?

  • A. Plasmolytic
  • B. Hypertonic.
  • C. Hypotonic.
  • D. Isosmotic.
Correct Answer: B

Rationale: Correct Answer: B - Hypertonic

Rationale:
1. A hypertonic solution has a higher solute concentration than the cell, causing water to move out of the cell by osmosis.
2. Water loss results in the cell shrinking, as observed in this scenario.
3. Plasmolytic refers to the process of cytoplasm shrinking due to water loss in a hypertonic environment.
4. Hypotonic and isosmotic environments would not cause the cell to shrink from water loss.

Which is an example of the comet organizational hierarchy for a wolf?

  • A. Muscle tissue, blood cell, DNA, organ, circulatory system, wolf.
  • B. Circulatory system, DNA, muscle tissue, blood cell, heart, wolf.
  • C. Blood cell, organ, circulatory system, muscle tissue, DNA, wolf.
  • D. DNA, blood cell, muscle tissue, heart, circulatory system, wolf.
Correct Answer: D

Rationale:

The aerodynamic nature of a bird's wing is an example of what central theme in biology?

  • A. Heredity.
  • B. Ontogeny.
  • C. Organisms and their environment.
  • D. Structure and function.
Correct Answer: D

Rationale:

Where can epithelial tissue be found?

  • A. Organ linings
  • B. Heart muscle
  • C. Tendons
  • D. Spinal cord
Correct Answer: A

Rationale: Epithelial tissue is a type of tissue that covers the surfaces of the body, inside and out. It forms the lining of various organs such as the skin, respiratory tract, gastrointestinal tract, and more. Therefore, epithelial tissue can be found in organ linings, making choice A the correct answer.

Where is DNA stored?

  • A. The nucleus
  • B. Ribosomes
  • C. Endoplasmic reticulum
  • D. Mitochondria
Correct Answer: A

Rationale: DNA, the genetic material of a cell, is stored within the nucleus. The nucleus serves as the control center of the cell and houses the DNA, which contains the instructions for building and maintaining the cell's structures and functions. Ribosomes are involved in protein synthesis, the endoplasmic reticulum plays a role in protein and lipid synthesis, while mitochondria are responsible for energy production through cellular respiration. Therefore, the correct answer is the nucleus where DNA is securely contained and regulated.

Copyright © 2025 Nokea. All rights reserved.