Microtubules are assembled from ____
a. keratin
b. myosin
c. laminin
d. actin
e. tubulin
ANSWER: e
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Fibroblast cells are a good model system for studying muscle differentiation because
A. they are totipotent. B. they never differentiate into muscle cells in a normally developing animal. C. they can differentiate into muscle cells in a normally developing animal. D. they express a limited number of genes. E. they have a small genome.
Soil protists often utilize bacteria as a nutrient source.
Answer the following statement true (T) or false (F)
Four of the five answers listed below are components of a nucleotide. Select the exception
a. pentose sugar b. amino acid c. cytosine d. phosphate group e. adenine
By definition, substances that absorb visible light are called:a
photons. b. pigments
c. porphyrins. d. nucleotides. e. hydrocarbons