At least __________ million people are now infected
with HIV.
a. 1
b. 6
c. 12
d. 20
e. 40
Answer: e
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Prior to their release, where are the special chemicals called neurotransmitters stored in a neuron?
A) axon B) synaptic knob C) dendrites D) cell body
In multicelled species, spores germinate and give rise
to filaments called __________. Fill in the blank(s) with the appropriate word(s).
When two dice are thrown, both dice will show the number three
A. one in two times. B. one in six times. C. one in thirty-six times. D. one in four times.
Four nucleic acid samples are analyzed to determine the percentages of the nucleotides they contain. Which of the following DNA sample(s) could be double-stranded DNA?
Sample 1: A(22%), G(28%), T(22%), U(0%), C(28%); Sample 2: A(30%), G(30%), T(0%), U(20%), C(20%); Sample 3: A(18%), G(32%), T(0%), U(18%), C(32%); Sample 4: A(29%), G(29%), T(21%), U(0%), C(21%) a. Sample 1 b. Samples 1 and 2 c. Samples 1 and 4 d. Samples 2 and 3 e. Samples 3 and 4