An enzyme is which of the following?

A - an acid

B - an amino nucleotide

C - a biological catalyst

D - an atom

The human nervous system is broken up into central and peripheral parts. the central system (cns) is made up of

Which statement best describes two paths carbon dioxide can take through the carbon cycle?

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Can some variations be subtle? Can some be extrem

Where does the chemical energy to convert ADP to ATP come from?

For some reason (not yet understood) more male babies are conceived (born) than female. By childhood the number of boys and girls is the same. what is the possible explanation for the higher mortality (both before and after birth) of male babies?

A child's pituitary gland does not release enough hormones. What is the most likely cause of this? A. The child has no ovaries. B. The child has no adrenal hormones. C. The child's blood glucose level is too high. D.

Which tissue is correctly paired with its primary cell type? which tissue is correctly paired with its primary cell type? bone; osteoblast connective tissue proper; chondroblast cartilage; fibroblast bone; fibrocyte?

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Roentgens are used to measure the amount of: A) uranium, B) fuel burned, C) radiation, D) hydrogen isotopes