The three primary germ layers are formed during
(a) fertilization.
(b) cleavage.
(c) organ formation.
(d) gastrulation.
(d) gastrulation.
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Irene knows her blood type is A, but William does not know his blood type. However, William knows that his mother and father both had blood type B. Irene and William's first child is a boy with type O blood. Based on this information, William's blood type could be
A. B only B. either B or O C. O only D. either AB or O E. A only
Some enzymatic receptors and most G protein-coupled receptors transmit the signal into the cytoplasm by utilizing other substances within the cytoplasm that are referred to as:
A. genes. B. intracellular receptors. C. second messengers. D. first messengers.
Many flowers growing in a cluster along a stem are known as
A. an inflorescence. B. a perfect flower. C. a bouquet. D. a complete flower. E. a pistil.
Nonsynonymous substitutions
A) do not lead to amino acid change. B) lead to amino acid change. C) refer to substitutions in unrelated lineages. D) affect only certain amino acids. E) lead to transversions.