A restriction enzyme:
is involved in chopping up the DNA from a donor organism.
targets a particular base-pair sequence on either side of the gene.
is usually involved in the first step of biotechnology.
usually recognizes a sequence that is four to eight base pairs long.
All of the above.
All of the above.
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Which scenario is not an example of a prezygotic isolating mechanism?
a. An iris blooms at a different time of the year than a daffodil. b. A peacock puts on a different mating display than a sparrow. c. A snail with a shell coiling in one direction cannot mate with a snail whose shell curls in the other direction. d. A zebroid, a cross between a horse and zebra, is sterile. e. One type of roundworm would reject the sperm from another species of roundworm.
When Bayliss and Starling conducted experiments to
determine what caused secretion of pancreatic juice, they a. cut the blood supply to the upper digestive tract. b. added acidic food to the small intestine and got secretions of pancreatic juices. c. cut the nerve supply to the upper digestive tract. d. got a response from the pancreas using extracts of cells lining the intestinal tract. e. did all of these except “cut the blood supply to the upper digestive tract.”
What is the sequence and polarity of the DNA strand complementary to the strand 5? AAATGTCCATGC 3??
A) 5? TTTACAGGTACG 3? B) 3? AAATGTCCATGC 5? C) 3? TTTACAGGTACG 5? D) 5? UUUACAGGUACG 3? E) 3? UUUACAGGUACG 5?
Classic albinism is an autosomal recessive mutation. However, two parents with albinism may produce a child with normal pigment. How can this be so?
What will be an ideal response?