Answer the following questions true (T) or false (F)
1. Restriction enzymes occur naturally in bacteria.
2. It is not possible for a human gene to work in any other organism.
3. A human clone would be as much like the person from whom it was cloned as "identical" twins are like each other.
1. TRUE
2. FALSE
3. TRUE
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Mendel found that pea plants expressing a recessive
trait a. were pure-breeding. b. appeared only in the first generation of a cross between two pure-breeding plants expressing contrasting forms of a trait. c. disappeared after the second generation. d. could be produced only if one of the parents expressed the recessive trait. e. were none of these.
In skeletal muscle, calcium ions are stored in the sarcoplasmic reticulum.
Answer the following statement(s) true (T) or false (F)
Organisms in the deep sea must tolerate
a. low temperatures and high nutrient levels. b. low temperatures and moderate nutrient levels. c. moderate temperatures and low nutrient levels. d. low temperatures and low nutrient levels.
Double fertilization occurs when
A. the sperm and tube nuclei fertilize the egg. B. two sperm cells fertilize the two polar nuclei. C. one sperm fuses with the egg and the other sperm fuses with both polar nuclei. D. the polar nuclei fuse with the egg after it has fused with the sperm.