The newly arriving tRNA binds in the region of the ribosome known as the ________ site.
Fill in the blank(s) with the appropriate word(s).
aminoacyl (A)
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Which of the following would help a virus avoid triggering an effective adaptive immune response?
I) having frequent mutations in genes for surface proteins II) building the viral shell from host proteins III) producing proteins very similar to those of other viruses IV) infecting and killing helper T cells A) only I and III B) only I, II, and IV C) only II and IV D) only I, II, and III E) only II, III, and IV
What structure will help prevent the backflow of blood within the veins?
a. Valves b. Skeletal muscle c. Endothelium d. Smooth muscle e. Basement membrane
Which statement is true of embryonic splitting?
a. It never occurs in nature. b. It involves the genetic contribution of only one parent. c. It produces immediate differentiation. d. It is applied in animal husbandry to produce genetically diverse offspring. e. It produces identical twins.
Occasionally the testes do not descend into the
scrotum as they should in a newborn. If this is not corrected surgically, a. sperm production will be affected. b. achieving an erection will not be possible. c. the child will have female characteristics. d. growth will be stunted. e. the child will not live.