21) DNA fragments cut by most restriction enzymes have:
A) double-stranded : 1380828.
21) DNA fragments cut by most restriction enzymes have:
A) double-stranded complementary ends.
B) either only sequences of Gs or only sequences of Cs.
C) cuts made at random points along one of the strands.
D) protruding sticky ends.
22) What is a clone?
A) any cell that contains recombinant DNA
B) a protein produced by a recombinant bacterium
C) an exact copy of a DNA, cell, or organism
D) any animal that contains recombinant DNA
23) In reproductive cloning, cells are subjected to an electric current under special circumstances. What effect does this have?
A) It removes an udder cell from an adult.
B) It removes DNA from an egg.
C) It mimics fertilization and begins embryonic development.
D) It introduces recombinant DNA.
24) In reproductive cloning:
A) an embryo from two parents is genetically modified.
B) bacteria are transformed with recombinant DNA.
C) many copies of a single gene are made.
D) adult mammals of a defined genotype are produced.
25) The combination of a somatic cell with an enucleated egg cell is:
A) transformation.
B) cell reprogramming.
C) somatic cell nuclear transfer.
D) transgenic biotechnology.
26) Dolly, the cloned sheep, is the product of which technique?
A) reproductive cloning
B) transformation
C) human gene transfer
D) gene therapy
27) In producing Dolly, the first cloned sheep, how many different sheep were involved, either contributing cells or acting as a surrogate mother?
A) two
B) four
C) three
D) six
28) In reproductive cloning, a sperm is not used, but an egg is still required. Why?
A) Udder cells will fuse only with egg cells.
B) Egg chromosomes are required for embryonic development.
C) Egg proteins are required for embryonic development.
D) Surrogate mother animals will develop only embryos derived from their own eggs.
29) How similar to the donor would a cloned human be?
A) They would be identical in looks and personalities.
B) They would be no more alike than identical twins.
C) They would look different but have the exact same personalities.
D) They would have the same genes, but everything else about them would be different.
30) “Dolly” or another reproductively cloned animal is a clone of:
A) bacteria that were used to generate the recombinant DNA in the animal.
B) an adult animal that contributed DNA to an enucleated egg.
C) the animal that donated the egg from which the clone developed.
D) a human that contributed genes to the recombinant DNA in the animal.
21) DNA fragments cut by most restriction enzymes have:
A) double-stranded : 1380828
