____ occurs within a single plant, while ____ occurs between two plants
a. A dihybrid cross; a monohybrid cross
b. Epistasis; polygenic inheritance
c. A testcross; cross-pollination
d. Self-pollination; cross-pollination
e. A dihybrid cross; self-pollination
ANSWER: d
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Which of the following correctly describes the fate of the embryonic germ layers?
A. The endoderm forms the gut, the ectoderm forms the epidermis and parts of the nervous system, and the mesoderm forms muscles and most internal organs. B. The endoderm forms the gut, the ectoderm forms the reproductive tract and endocrine system, and the mesoderm forms muscles and most internal organs. C. The endoderm forms the inner part of all internal organs, the mesoderm forms the middle parts, and the ectoderm forms the outer coverings. D. The layers are sequential structures that all disappear during development, with the endoderm appearing first and then is replaced by the mesoderm, which in turn is supplanted by the ectoderm. E. The endoderm is an embryonic structure that disappears early, whereas the ectoderm persists as the skin and the mesoderm as the internal organs.
Except for the stop codons, the codons in the genetic code specify which of the ____ amino acids will be added to a
growing polypeptide chain.
a. 5 b. 64 c. 4 d. 20 e. 3
Which animal has compound eyes?
a. protist b. insect c. cephalopod mollusk d. vertebrate e. amphibian
Periderm is the functional replacement of the bark
____________________ Indicate whether the statement is true or false.