Certain meteorites have been examined and found to carry samples of which one of the following?
A. lipids
B. amino acids
C. photosynthetic bacteria
D. lipids and amino acids
E. lipids, amino acids, and photosynthetic bacteria
Answer: D
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Life probably would never have emerged on Earth if the ancient atmosphere had been the same as the present one in
regard to the content of ____. a. carbon dioxide b. hydrogen c. oxygen d. nitrogen e. carbon monoxide
Which of the following statements is true regarding neurosecretory cells of the hypothalamus? Select all correct choices
A. They secrete releasing factors. B. They secrete thyroid-stimulating hormone (TSH). C. Their cell bodies reside in the hypothalamus. D. Their cell bodies reside in the (posterior) pituitary gland. E. They do not produce hormones, as they are neurons and not endocrine cells.
The plant in Row B of the accompanying figure demonstrates a photoperiodic response characteristic of:
a. short-day plants. b. day-neutral plants. c. long-day plants. d. long-night plants. e. intermediate-day plants.
The silver nitrate that is present in the Breathalyzer solution is not written in the balanced chemical equation because it is a(n) ___ in this reaction.
Fill in the blank(s) with the appropriate word(s).