You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg. Of this dry weight, how much would you expect to be made up of o
A) 1 gram
B) 4 grams
C) 40 grams
D) 960 grams
E) 1 kg
Answer: D
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a. 1 b. 2 c. 3 only d. 4 only e. 3 and 4
Biotechnology products produced by bacteria include all of the following EXCEPT
A. insulin. B. antibodies to deliver radioisotopes to tumor cells. C. clotting factor VIII. D. human growth hormone.
The formation of carbonic acid in the oceans directly results in
A) increased sea surface temperatures. B) inhibition of shell growth in marine animals. C) increased marine biodiversity. D) increased pH.
Which of the following statements about UV radiation is true?
a. It is necessary for the body to make vitamin B. b. The amount of UV radiation that reaches the Earth's surface is fairly constant. c. The ozone hole is responsible for the Greenhouse Effect, but has no impact on levels of UV radiation. d. Individuals with less melanin suffer less wrinkling and skin cancer. e. Exposure to ultraviolet rays causes the epidermis to thicken and produce more melanin.