Which embryonic tissue is defective if an embryo
develops into a creature that cannot move and has no
supportive or circulatory system?
a. ectoderm
b. endoderm
c. mesoderm
d. somatoderm
e. all of these
Answer: c
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Prokaryotes may ingest particles via phagocytosis
Indicate whether this statement is true or false.
The portion of the DNA molecule that is ultimately translated is composed of
a. introns. b. anticodons. c. exons. d. transcriptions. e. regulatory proteins.
Which extraembryonic membrane lies immediately beneath the shell of a reptile embryo?
A) Allantois B) Chorion C) Amnion D) Yolk sac E) Placenta
What is the significance of the industrial practice of waiting for cultures to enter the stationary phase of growth before harvest?
A. The cells are at peak metabolic activity. B. Secondary metabolites are often the desired product, and are only produced in stationary phase. C. The desired primary metabolites are produced in stationary phase. D. Potential toxins from log phase growth have been depleted. E. An optimal combination of primary and secondary metabolites is being produced.