Which of the following is not a goal of
cloning?
a. bring animals back from extinction.
b. form replacement tissues and organs.
c. increase numbers of endangered animals.
d. clone valuable livestock.
e. all of these are goals
E
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Compared to viewing a distant object, a human viewing an object held within five centimeters of the eye requires a lens that _____
A) has been flattened, as a result of contraction of the ciliary muscles B) has been made more spherical, as a result of contraction of the ciliary muscles C) has been flattened, as a result of relaxation of the ciliary muscles D) has been made more spherical, as a result of relaxation of the ciliary muscles E) does not change its shape
A 39-year-old woman is in her sixth week of pregnancy. Due to her advanced age, she is at higher risk for having a baby with Down's syndrome than younger pregnant women. She would like to find out as early as possible whether or not her baby has Down's syndrome. Her doctor should suggest
A. amniocentesis. B. genetic counseling. C. chorionic villi sampling. D. a pedigree analysis.
Second messengers are molecules of
a. steroid compounds. b. cyclic AMP. c. ADP. d. prostaglandin. e. intermedin.
Bacillus licheniformis secretes a compound that inhibits the growth of other Gram-positive bacteria. This is an example of a(n)
A) analog. B) antibiotic. C) chemotherapeutic. D) porin. E) toxin.