Nursing Elites

1. Fill in the blanks in the following sentence: Enzymes are ________ molecules that serve as _______ for certain biological reactions.

• A. complex; suppressors
• B. acidic; triggers
• C. small; targets
• D. large; catalysts

Correct answer: D

Rationale: Enzymes are large molecules that act as catalysts, accelerating chemical reactions by lowering the activation energy required for the reactions to occur. In the context of biological reactions, enzymes function as catalysts, not suppressors, triggers, or targets. The use of 'large' and 'catalysts' accurately describes the nature and role of enzymes in facilitating biological processes.

2. Which of the following is an example of a polymer?

• A. Methane
• B. Ethanol
• C. Polyethylene
• D. Acetic acid

Correct answer: C

Rationale: The correct answer is C, Polyethylene. Polyethylene is a polymer composed of a large number of repeating ethylene units linked together, forming a long-chain molecule, characteristic of polymers. Methane, ethanol, and acetic acid are small organic molecules that do not demonstrate the repeating unit structure typical of polymers. Therefore, they are not examples of polymers.

3. Why do cicadas make a buzzing sound?

• A. To orient via echolocation
• B. To attract a mate
• C. To locate a food source
• D. To ward off predators

Correct answer: B

Rationale: Cicadas make a buzzing sound primarily to attract a mate. This sound is a mating call produced by the males to attract females for reproduction. While echolocation is used by some animals like bats for navigation, cicadas do not use buzzing for orientation. Buzzing is not related to locating a food source or warding off predators in the case of cicadas.

4. What is the basic structural and functional unit of the nervous system?

• A. Axon
• B. Neuron
• C. Dendrite
• D. Synapse

Correct answer: B

Rationale: The correct answer is B: Neuron. Neurons are indeed the basic structural and functional units of the nervous system. Neurons are specialized cells that transmit signals throughout the nervous system, enabling communication and coordination of various functions within the body. While axons, dendrites, and synapses are all essential components of neurons and neural function, the neuron as a whole is considered the fundamental building block responsible for signal transmission. Choice A, Axon, is incorrect because an axon is a part of a neuron responsible for transmitting electrical signals away from the cell body. Choice C, Dendrite, is incorrect because dendrites are extensions of a neuron that receive signals from other neurons. Choice D, Synapse, is incorrect because a synapse is the junction between two neurons where signals are transmitted.

5. Which of the following sentences correctly uses subject-verb agreement?

• A. The lead scientist writes the reports; however, all scientists in the group do the research.
• B. The lead scientist is the one who writes the reports; however, she is the only one of the scientists who does the research.
• C. The lead scientist writes the reports; however, she is the only one of the scientists who does the research.
• D. The lead scientist is the one who writes the reports; however, every scientist in the group does the research.

Correct answer: B

Rationale: The correct answer is B because it maintains subject-verb agreement. In this sentence, 'she is' agrees with 'the lead scientist,' and 'does' agrees with 'she.' Choices A, C, and D have subject-verb agreement errors. In choice A, 'write' should be 'writes' to match the singular subject 'The lead scientist,' and 'does' should be 'do' to match the plural 'scientists in the group.' Choice C also has the same subject-verb agreement error as A. In choice D, 'do the research' should be 'does the research' to match the singular 'every scientist in the group.'

Similar Questions