The belief that humans arose in sub-Saharan Africa and then moved out is which model of evolution?

a. classic
b. retroactive
c. multiregional
d. migratory
e. African emergence


E

Biology & Microbiology

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Which of the following enzymes is responsible for specifically transcribing tRNA in eukaryotic cells?

A) RNA polymerase I B) RNA polymerase II C) RNA polymerase III D) primase E) RNase H

Biology & Microbiology

Ionizing radiation can produce which of the following?

A. cytosine B. free radicals C. stop codons D. thymine dimers E. hypoxanthine

Biology & Microbiology

When a myosin head binds to an actin molecule in order to contract a muscle, this is formed: ________

A) myosin filament B) actin filament C) cross-bridge D) troponin

Biology & Microbiology

Answer the following questions true (T) or false (F)

1. Different cell layers may have different cell adhesion molecules. 2. Menopause and puberty are both examples of developmental changes. 3. Normally, anywhere from one to four sperm fertilize the egg.

Biology & Microbiology