The atomic number of an atom is
A. the number of protons in the atom.
B. the number of neutrons in the atom.
C. the number of protons and electrons in the atom.
D. the number of protons and neutrons in the atom.
E. None of these choices are correct.
A. the number of protons in the atom.
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Which number identifies the promoter?
a. 1 b. 2 c. 3 d. 4 e. 5
The active ingredient in Ecstacy works by
a. binding to active transporters in brain neuron membranes. b. blocking the movement of neurotransmitters across synapses c. binding to neuroreceptors on the ends of neurons d. stopping signal transmissions down the length of an axon e. inhibiting the release of neurotransmitters at the synaptic junction
When the pituitary gland releases thyroid-stimulating hormone (TSH), the hormone circulates throughout the entire bloodstream, yet only the cells of the thyroid gland respond. This specificity is due to the presence of _____ in the cell membranes of the thyroid
1.adhesion proteins 2.receptor proteins 3.recognition proteins 4.transport proteins
Which of the following statements regarding dynamic instability is false?
(a) Each microtubule filament grows and shrinks independently of its neighbors. (b) The GTP cap helps protect a growing microtubule from depolymerization. (c) GTP hydrolysis by the tubulin dimer promotes microtubule shrinking. (d) The newly freed tubulin dimers from a shrinking microtubule can be immediately captured by growing microtubules and added to their plus end.