In amphibians, the gray crescent appears
a. after the egg matures.
b. after fertilization.
c. during blastula formation.
d. following gastrulation.
e. as a result of tissue specialization
B
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All fungi can only reproduce sexually
Indicate whether the statement is true or false.
Primary metabolites
A. are compounds needed for the synthesis of microbial cells in the primary growth phase. B. are compounds that accumulate during the period after primary growth phase and have no direct relationship to the synthesis of cell materials. C. include bacteriocins and other similar cytotoxic compounds. D. include compounds such as antibiotics and mycotoxins.
Select all of the ways you could have acquired nitrogen that is now in your proteins, DNA, and RNA:
What will be an ideal response?
What are the two most likely reasons for cellular senescence (the loss of proliferative ability)?
a. DNA damage and telomere lengthening b. DNA damage and telomere shortening c. DNA intactness and telomere shortening d. DNA intactness and telomere lengthening