The sperm produced by mosses require _____ to reach an archegonium.
a) animals
b) light
c) the development of a flower
d) wind
e) moisture
Ans: e) moisture
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The products of genes that are switched on in specific tissues at specific stages of development affect mainly
a. gene replication.
b. gene transcription. c. mRNA transcript processing. d. translation. e. post-translational processing of proteins.
Which of the following is a phase of the
menstrual cycle? a. follicular phase b. luteal phase c. ovulation d. all of these e. none of these
Which of the following statements about early embryonic development in humans is false?
a. The embryo is moved along the oviduct by ciliary action and muscular contraction. b. The embryo develops through the blastula stage while floating free in the uterus. c. The embryo enters the uterus about 24 hours after fertilization. d. Early division of the embryo occurs in the oviduct. e. Implantation of the embryo occurs about seven days after fertilization.
The macromolecule composed of amino acids is a
A. carbohydrate. B. steroid. C. lipid. D. protein. E. nucleic acid.