Which of the following may cause reactivation of varicella-zoster virus as shingles?
A. Surgery
B. Developing malignancy
C. X-ray treatments
D. Iimmunosuppressive conditions
E. All of the choices are correct.
Answer: E
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Answer the following statements true (T) or false (F)
1. The same neurotransmitter may produce either excitatory or inhibitory effects on postsynaptic neurons depending on the specific receptor type it binds. 2. Gamma aminobutyric acid (GABA) is the most common inhibitory neurotransmitter in vertebrates. 3. Ionotropic receptors act by activating G proteins in target cells. 4. Metabotropic receptors act by initiating changes in second messenger systems in target cells.
Which of the following is NOT a condition of
genetic equilibrium in a population?
a. no mutations in the population b. the population is small c. the population is isolated d. mating is random e. all of these ARE conditions of genetic equilibrium in a population
A type of gland that secretes an oily substance that softens and protects hair is a(n) _____ gland.
A. salivary B. mammary C. sweat D. sebaceous E. endocrine
Imagine that you have been hired as a chemist and your first task is to examine a newly discovered atom. The paperwork you are given states that its atomic number is 110. What does this mean?
A) The atom contains 55 electrons. B) The atom contains 110 protons. C) The atom contains 55 protons and 55 neutrons. D) The atom is an isotope.