Nokea
Which of the following are properties of a liquid?
- A. High atomic attraction
- B. Fixed volume
- C. Low pressure
- D. Takes shape of container
Correct Answer: D
Rationale: The correct answer is D: 'Takes shape of container.' Liquids exhibit the property of taking the shape of their container while maintaining a fixed volume. This is due to the ability of liquid particles to flow and move freely within the container. Choices A, B, and C are incorrect. Choice A, 'High atomic attraction,' is not a general property of liquids as the level of attraction between liquid particles can vary. Choice B, 'Fixed volume,' is partially correct as liquids do have a fixed volume, but they do not have a fixed shape. Choice C, 'Low pressure,' is not a defining property of liquids.
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What is the primary function of the liver in the digestive system?
- A. To absorb water
- B. To produce bile
- C. To store glucose
- D. To regulate metabolism
Correct Answer: B
Rationale: The liver's main function in the digestive system is to produce bile. Bile helps in the digestion and absorption of fats by emulsifying them, breaking down large fat globules into smaller droplets that can be acted upon by digestive enzymes. Choices A, C, and D are incorrect because the liver's primary role in the digestive system is not to absorb water, store glucose, or regulate metabolism. While the liver does have roles in metabolism and glucose regulation, its key function in digestion is bile production.
A scientist wants to conduct quantitative research. Which method should they use?
- A. Collecting patient narratives.
- B. Tracking the dosage of a drug and its blood levels in the patient.
- C. Observing a patient's physical changes.
- D. Writing journal notes about the research experience.
Correct Answer: B
Rationale: In quantitative research, numerical data is collected and analyzed. Choice B, tracking the dosage of a drug and its blood levels in the patient, involves collecting quantitative data, making it the correct method. Choices A, C, and D involve qualitative data such as narratives, physical observations, and journal notes, which do not align with the quantitative research method.
DNA has both a 'sense' and 'antisense' strand. What is true about the antisense strand?
- A. It runs 5' to 3'.
- B. It runs 3' to 5'.
- C. It is used in replication.
- D. It is the direction DNA is stored.
Correct Answer: B
Rationale: The correct answer is B: 'It runs 3' to 5'. The antisense strand runs in the 3' to 5' direction, complementing the sense strand. Choice A is incorrect as the antisense strand runs in the opposite direction, which is 3' to 5'. Choice C is incorrect because the antisense strand is not directly involved in replication. Choice D is incorrect as the direction DNA is stored is not determined by the antisense strand.
Which part of the neuron receives signals from other neurons?
- A. Axon
- B. Dendrite
- C. Synapse
- D. Myelin sheath
Correct Answer: B
Rationale: The correct answer is B, Dendrite. Dendrites are the part of the neuron that receive signals from other neurons and transmit them to the cell body. Axons transmit signals away from the cell body, synapse is the junction between neurons where neurotransmitters are released, and myelin sheath is a fatty layer that insulates and speeds up signal conduction along the axon. Therefore, choices A, C, and D are incorrect in the context of receiving signals from other neurons.
Which of the following structures in the cell is responsible for producing ATP?
- A. Ribosome
- B. Nucleus
- C. Mitochondria
- D. Endoplasmic reticulum
Correct Answer: C
Rationale: The correct answer is C, Mitochondria. Mitochondria are known as the powerhouse of the cell and are responsible for producing ATP, the primary energy currency of the cell through cellular respiration. Ribosomes (Choice A) are involved in protein synthesis, the nucleus (Choice B) stores genetic material and controls cell activities, and the endoplasmic reticulum (Choice D) plays a role in protein synthesis, lipid metabolism, and detoxification, but none of these structures are directly responsible for producing ATP.