Which of the following must be accomplished FIRST in order to conduct RT-PCR?
A) Complementary DNA must be synthesized from double-stranded DNA.
B) Complementary DNA must be synthesized from RNA.
C) Complementary DNA must be synthesized from proteins.
D) Complementary DNA must be synthesized from single-stranded DNA.
Answer: B
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Nondisjunction of chromosomes during
meiosis can lead to
a. directional selection. b. disruptive selection. c. sympatric speciation. d. hybrid sterility. e. allopatric speciation
Rod-shaped bacteria such as Escherichia coli are called ________ based on the shape of the cells
A) bacilli B) cocci C) gram positive D) thermophiles E) anaerobes
What would be the ultimate effect on an ecosystem if decomposers were eliminated?
a. The consumers would have to eat twice as much. b. The rate of photosynthesis would increase. c. All life would eventually cease as nutrients would no longer be available. d. Energy flow between producers and consumers would increase. e. Producers would outgrow consumers due to the excess of carbon dioxide.
The protein p53 activates genes that _____
A) increase mutation rate B) lead to higher production of growth factors for the cell C) increase the rate of endocytosis D) arrest the cell cycle