Which of the following is a vector used to deliver genes in human gene therapy?
A) Parvovirus
B) Rabies virus
C) Adeno-associated virus
D) E. coli
C) Adeno-associated virus
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Why do scientists use model organisms?
What will be an ideal response?
Birds differ from earlier vertebrates by
a. their lack of scales. b. producing land eggs. c. the ability to maintain a constant body temperature through metabolic activities. d. the ability to fertilize eggs internally. e. their possession of a dorsal nerve cord.
The observation by scientists that flies preferentially mate with those of similar phenotypes illustrates
random mating. Indicate whether the statement is true or false.
The sex of a human is determined by the:a
number of chromosomes. b. number of autosomes. c. presence of only one X chromosome. d. number of sex chromosomes. e. presence of a Y chromosome.