Nokea
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.
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Human cells need oxygen for respiration. What system of the body is responsible for transporting an oxygen molecule to different locations throughout the body?
- A. Skeletal.
- B. Lymphatic.
- C. Respiratory.
- D. Circulatory.
Correct Answer: D
Rationale:
Which term means the movement of water across a semi-permeable membrane from a low solute concentration to a high solute concentration?
- A. Active Transport.
- B. Passive Transport.
- C. Osmosis.
- D. Diffusion.
Correct Answer: C
Rationale: The correct answer is C: Osmosis. Osmosis is the movement of water molecules across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration. This process occurs passively, without the need for energy input.
Rationale:
1. Osmosis specifically refers to the movement of water molecules.
2. It occurs across a semi-permeable membrane.
3. The direction of movement is from low solute concentration to high solute concentration.
4. Osmosis is a passive transport process, as it does not require energy.
Summary:
A: Active Transport involves the movement of molecules against the concentration gradient, requiring energy input.
B: Passive Transport includes processes like diffusion and osmosis but does not involve active energy expenditure.
D: Diffusion is the movement of molecules from high concentration to low concentration, not specific to water movement across a membrane.
Which of the following is the best example of a hypothesis?
- A. Dogs like treats
- B. Red is the best color
- C. If I eat 100 donuts, then I will feel sick
- D. If a plant is exposed to red light, then it will show less growth than natural light.
Correct Answer: D
Rationale: A hypothesis is a testable statement that predicts the outcome of an experiment based on observations or research. Option D is the best example of a hypothesis as it presents a clear cause-and-effect relationship that can be tested through an experiment. Options A, B, and C do not provide a clear prediction or testable statement, making them weaker examples of hypotheses. In contrast, option D clearly states the expected outcome of exposing a plant to red light, allowing for a specific experiment to test this hypothesis.
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:
Which method of glucose conversion generates the most usable and efficient form of ATP within the human body?
- A. Lactic acidosis.
- B. Fermentation conversion.
- C. Anaerobic respiration.
- D. Aerobic respiration.
Correct Answer: D
Rationale: