According to the currently popular scientific theory for the origin of life, which of the following processes originated after the others?
A. photosynthesis
B. aerobic respiration
C. anaerobic respiration
D. protein synthesis
B. aerobic respiration
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Which antibodies cross the placenta and protect the fetus?
A. IgA B. IgG C. IgM D. IgD
Four of the five choices listed below are made only
of gametophyte tissue. Select the exception. a. pollen grains b. megaspore c. ovule d. pollen tube e. male gametophyte
People with albinism carry two copies of the ____________________ allele (aa) and cannot make a pigment called
____________________ which is the principal pigment in skin, hair and eye color. Fill in the blank(s) with the appropriate word(s).
Alkapton urea is a familial disease that is autosomal recessive. The defective enzyme in affected individual prevents the metabolism of _____________
A) Procussic acid B) Homogentisic acid C) tyrosine D) alkapton E) phenolalanine