Each amino acid is specified by a set of ___________ base(s) in mRNA.
(a) one
(b) two
(c) three
(d) four
(c) three
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Which of the following statements about the organization of complex multicellular organisms is false?
A. Exterior cells are highly differentiated whereas interior cells are not differentiated. B. Only some cells are in direct contact with the environment. C. Interior cells cannot grow as fast as exterior cells without mechanisms to transfer nutrients between cells. D. Exterior cells receive environmental signals directly, whereas interior cells receive environmental signals indirectly. E. Signals transferred from exterior cells to interior cells can activate or repress gene expression in the interior cells.
The defining characteristic of a stem cell is
A) self-repair. B) self-renewal. C) the ability to turn into a cancer cell. D) its origin from a progenitor cell.
The movement of substances from the blood into the proximal tubule is known as ____.
Fill in the blank(s) with the appropriate word(s).
Pasteur's experiments on fermentation laid the foundation for
A) industrial microbiology. B) epidemiology. C) immunology. D) abiogenesis. E) antisepsis.