The p21 and p15 proteins are examples of

a. Cdk inhibitors.
b. cyclins.
c. oncogenes.
d. growth factors.


Answer: a. Cdk inhibitors.

Biology & Microbiology

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The __________ is a sedimentary cycle; Earth's crust is the largest reservoir, and there is no major

gaseous form. Fill in the blank(s) with the appropriate word(s).

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Which gene sequence elements are present in prokaryotes?

a. codons b. capping signals c. poly(A) signals d. sorting signals on proteins

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Interspecific competition is a density-independent factor

Indicate whether the statement is true or false

Biology & Microbiology

When bacteria are inoculated into a new sterile nutrient broth, their numbers don't begin to increase immediately. Instead, there is a lag phase that may last for an hour or even several days. Why don't bacterial numbers increase immediately?

a. There are not enough nutrients for the bacteria to grow, and growth is delayed until there are some dead cells to cannibalize. b. The bacteria have to establish a biofilm before their numbers can increase. c. The bacteria must adjust to the nutrient content in the new medium, synthesizing necessary amino acids, growth factors, and enzymes. d. The medium contains inhibitors that prohibit rapid growth of the bacteria, and these must be inactivated before bacterial numbers will increase.

Biology & Microbiology