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

Biology & Microbiology

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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.

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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

Biology & Microbiology

The light-independent reactions of photosynthesis (Calvin cycle) take place in the 

A. thylakoids. B. cytoplasm. C. grana. D. stroma.

Biology & Microbiology

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

Biology & Microbiology