Carbon-14 is useful in determining the age of a fossil up to about ___________ years ago
A. 100,000
B. 40,000
C. 10,000
D. 50,000
E. 20,000
C. 10,000
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When the Catabolite Activator Protein binds to its binding site in DNA, it
A. bends the DNA. B. eliminates the need for a sigma factor on the part of RNA polymerase. C. promotes the assembly of other transcription factors at the promoter. D. displaces repressors.
The absolute refractory period characteristic of neurons is important in ensuring that action potentials travel in only one direction
Indicate whether the statement is true or false
The light-independent reactions of photosynthesis (Calvin cycle) take place in the
A. thylakoids. B. cytoplasm. C. grana. D. stroma.
Where does the digestion of proteins begin in humans?
a. in the stomach b. in the small intestines c. in the pancreas d. in the large intestine