The great apes and first hominids arose from a common ancestor about how many million years ago?
a. 1
b. 3
c. 5
d. 7
e. 9
ANSWER: d
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Which of the following represents the charged
environment inside a neuron and in the interstitial fluid that surrounds it?
a. negatively charged proteins inside; more sodium ions inside than outside; more potassium ions outside than inside b. positively charged proteins inside; more sodium ions inside than outside; more potassium ions outside than inside c. negatively charged proteins inside; more sodium ions outside than inside; more potassium ions inside than outside d. positively charged proteins inside; more sodium ions outside than inside; more potassium ions inside than outside e. negatively charged proteins inside; equal amounts of sodium and potassium ions inside and outside
how many virus particles per cell does "serum hep" provide?
What will be an ideal response?
Variations in genes are called ________. Examples of these variations include eye color. There are blue eyes, green eyes, brown eyes, and several combinations of these.
A. polymorphisms B. alleles C. traits D. homeologues
An enzyme is about the same as a(n)
A. catalyst. B. inhibitor. C. substrate. D. end product.