The ion that increases its intracellular concentration in order to trigger the release of neurotransmitters is
A. HCO3-
B. Ca2+
C. Cl-
D. Mg2+
E. K+
Answer: B
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The first genome to be synthesized was that of
A) the influenza virus. B) the fruit fly. C) E. coli. D) Mycoplasma genitalium.
What is the function of signal transduction?
What will be an ideal response?
Which portion of DNA contains the genetic information "read" by the RNA polymerase and transmitted into mRNA?
A) sugar B) backbone C) phosphodiester bond D) base
Which of the following statements about membrane-enclosed organelles is true?
(a) In a typical cell, the area of the endoplasmic reticulum membrane far exceeds the area of plasma membrane. (b) The nucleus is the only organelle that is surrounded by a double membrane. (c) Other than the nucleus, most organelles are small and thus, in a typical cell, only about 10% of a cell's volume is occupied by membrane-enclosed organelles; the other 90% of the cell volume is the cytosol. (d) The nucleus is the only organelle that contains DNA.