Embryonic stem cells are different from primary cell cultures or permanent cell lines derived from a tissue in that they are capable of
a. generating many cell types.
b. growing and dividing.
c. synthesizing their own DNA.
d. transporting nutrients across their plasma membrane.
Ans: a. generating many cell types.
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Most prokaryotes
a. are rare in nature. b. are easily cultured in the laboratory. c. can’t be cultured. d. are large enough to see with the naked eye. e. are none of these.
The Protenor mode of sex determination is the ________
A) XO/YY scheme B) XX/XO scheme C) hermaphroditic scheme D) scheme based on F plasmids inserted into the FMR-1 gene E) scheme based on single translocations in the X chromosome
Which of these is not a common concern about genetically modified food crops?
A) They may have unintended negative effects on surrounding organisms. B) They may cause the evolution of pesticide-resistant crop pests. C) They may cause a reduction of genetic diversity among food crops. D) They may increase the number of human infections by transgenic E. coli. E) They may cause unforeseen allergies in those who consume the genetically modified food.
What mammalian hormone is most similar in amino acid structure to arginine vasotocin in chickens?
A. Oxytocin B. Antidiuretic hormone C. Angiotensin II D. Growth hormone E. Aldosterone