Viroids are constructed primarily of ____
a. lipids
b. DNA
c. protein coats
d. RNA
e. bacteriophages
ANSWER: d
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Consider the pathway for the synthesis of the amino acid arginine in Neurospora:
Mutant strains of Neurospora may carry one or more mutations. Neurospora mutant strain b is grown on minimal media plus supplements as shown. Growth is shown by (+) and no growth is shown by (o).
A) Strain a has only one mutation and it is in ARG-E.
B) Strain b has only one mutation and it is in ARG-H.
C) Strain a has a mutation in ARG-F and strain b has a mutation in ARG-E.
D) Strain b has mutations in ARG-E, ARG-F, and ARG-H.
The spindle apparatus is composed of
a. Golgi bodies. b. microtubules. c. endoplasmic reticulum. d. nucleoprotein. e. chromatids.
DNA repair in eukaryotes and prokaryotes
A) relies on DNA polymerases to correct all mutations. B) relies on completely different mechanisms. C) is accomplished by multiple specialized pathways. D) can only repair abnormal nucleotides such as pyridine dimers and depurinated bases. E) is very ineffective.
Which type of renewable energy makes the greatest contribution to the overall U.S. consumption of energy?
A. Bioenergy B. Hydropower C. Solar D. Wind E. Geothermal