Which of the following is a source of vitamin K for humans?
A) Bacteroides thetaiotetraiotamicron digests foods, which release vitamin K.
B) Escherichia coli in their digestive tract produces vitamin K.
C) S. epidermidis releases vitamin K from dead cells.
D) their diet only
Ans: B) Escherichia coli in their digestive tract produces vitamin K.
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The potential energy in a molecule of ATP is held in the:
A. carbon-carbon bonds of the sugar. B. repulsion of the phosphate groups from each other. C. the carbon-nitrogen bonds of the base. D. the carbon-oxygen bonds of the sugar. E. repulsion of the sugar and the base.
DNA is protected from restriction enzymes by being
A. sequestered in a lysosome. B. turned into RNA. C. methylated. D. made into double-stranded RNA.
Miller and Urey's experiment provided support for what hypothesis? In what way did the discovery of hydrothermal vents alleviate concern about the validity of their simulation of the Earth's primitive atmosphere?
What will be an ideal response?
Endosperm tissue arises by the fusion of a sperm nucleus with two nuclei of the
A. female egg. B. female gametophyte central cell. C. male gametophyte. D. ovule wall. E. female style.