Nokea
Which set is correctly listed from largest to smallest group?
- A. Genus, order, species, phylum.
- B. Phylum, order, genus, species.
- C. Order, phylum, species, genus.
- D. Species, order, phylum, genus.
Correct Answer: B
Rationale:
You may also like to solve these questions
Enzymes can ................. reactions.
- A. Catalyze
- B. Inhibit
- C. Stop
- D. None of the above
Correct Answer: A
Rationale: Enzymes function to catalyze reactions, which means they accelerate the rate of chemical reactions without being consumed in the process. Enzymes do not inhibit or stop reactions; instead, they facilitate and enable reactions to occur more efficiently. Therefore, the correct answer is 'Catalyze.'
What molecules are unmetabolized by the body, but are used to increase reaction rates?
- A. Sugars.
- B. Proteins.
- C. Enzymes.
- D. Lipids.
Correct Answer: C
Rationale: The correct answer is C: Enzymes. Enzymes are molecules that increase reaction rates by acting as catalysts in biochemical reactions. They are not metabolized by the body, meaning they remain unchanged after facilitating the reactions. Sugars (choice A), proteins (choice B), and lipids (choice D) are all metabolized by the body to provide energy or building blocks for various cellular functions, unlike enzymes which remain unchanged. Therefore, enzymes are the only choice that fits the description of being unmetabolized molecules used to increase reaction rates.
Which hormone is produced by the pineal gland?
- A. insulin
- B. testosterone
- C. melatonin
- D. epinephrine
Correct Answer: C
Rationale: The correct answer is melatonin (Choice C). The pineal gland is responsible for producing melatonin, a hormone that regulates sleep-wake cycles. Insulin (Choice A) is produced by the pancreas and regulates blood sugar levels. Testosterone (Choice B) is primarily produced by the testes in males and in smaller amounts by the ovaries in females. Epinephrine (Choice D) is produced by the adrenal glands and is involved in the body's fight-or-flight response.
What does the mitochondrion produce that causes it to often be called the powerhouse of the cell?
- A. ATP
- B. Enzymes.
- C. Proteins.
- D. DNA.
Correct Answer: A
Rationale:
A child is sick. They have a body temperature that exceeds 37Å—C. The body senses this and begins to sweat in order to lower the temperature. What is this an example of?
- A. Positive feedback loop
- B. Negative feedback loop
- C. Both
- D. None of the above
Correct Answer: B
Rationale: This scenario describes a negative feedback loop. In negative feedback, the body's response works to reverse the initial stimulus, in this case, sweating to lower the elevated body temperature. This mechanism helps maintain homeostasis by regulating the body's temperature back to the normal range.