Differentiation of cells into specialized cell types ____
a. results in a colony organism
b. occurred when distinct species began to cohabitate
c. decreases survivability
d. requires cell signals affecting gene expression
e. requires cell signals affecting gene replication
ANSWER: d
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In transformation experiments using a variety of Bacteria, it has been noted that essentially all of the cells in a population can become competent
Indicate whether the statement is true or false.
Fern leaves emerge as tightly coiled structures called:
A. microsporangia. B. fiddleheads. C. protonema. D. horsetails. E. prothallus.
Which of the following does NOT add carbon dioxide to the atmosphere?
a. forest fires b. decomposers c. burning of fossil fuels d. photosynthesis e. decomposer respiration
Which of the following proteins exerts direct control over the glycogen synthesis and breakdown pathways when epinephrine stimulates glycogen conversion to glucose in liver cells?
A) glycogen phosphorylase B) phosphorylase kinase C) protein kinase A D) cAMP phosphodiesterase E) glycogen synthase