Which of the following must be present for a cell to enter mitosis?
a. favorable environment
b. high enough cell mass
c. growth factor
d. all of these
D
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Consumer fears and uncertainty about the safety of cloned milk and meat have prevented these products from being sold in stores even though the ____________________ has ruled that such food is safe
Fill in the blank(s) with correct word
A carbon atom with six protons, seven neutrons, and six electrons has a mass number of
a. 6. b. 7. c. 12. d. 13. e. 19.
Is the regulation of blood sugar levels in the body a negative feedback loop or a positive feedback loop?
A. negative feedback loop B. positive feedback loop
X-ray diffraction studies are used to determine:a
the sequence of amino acids in protein molecules. b. the sequence of nucleic acids in nucleic acid molecules. c. the distances between atoms of molecules. d. the type of chemical under investigation. e. the wavelength of light emitted by chemicals