Which ancestors of modern humans migrated out of Africa to populate the rest of the world?

a. Homo habilis
b. Homo erectus
c. Neanderthals
d. Cro-Magnon
e. Homo sapiens


ANSWER: b

Biology & Microbiology

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Nearsightedness is dominant to normal vision and hazel eyes are dominant to blue eyes. A nearsighted woman with hazel eyes who is heterozygous for both traits marries a man with normal vision and hazel eyes. His genotype for eye color is the same as his wife's. Their three children all have blue eyes and normal vision. What is the probability that their next child will have blue eyes and be

nearsighted? A. 1/4 B. 1/2 C. 3/8 D. 1/8 E. 5/8

Biology & Microbiology

Carbonic anhydrase

a. combines with water to form carbonic acid. b. dissociates into bicarbonate and hydrogen ions. c. is normally found in red blood cells. d. is responsible for maintaining the high levels of carbon dioxide in the lungs and the low levels of carbon dioxide in the body tissues. e. includes all of these descriptions.

Biology & Microbiology

When making a karyotype, what is the effect of placing lymphocytes in a low-salt solution?

A. It makes the chromosomes more visible. B. It initiates cell division. C. It stops the cells in metaphase. D. It helps separate the chromosomes. E. It causes the cells to swell.

Biology & Microbiology

A protein that becomes marked in a sequence called the destruction box and is degraded by proteasomes is

a. tubulin. b. cyclin. c. Ras. d. cAMP-dependent protein kinase.

Biology & Microbiology