Characteristics of which virus consist of a double-stranded genome and virions that appear as oval, brick-shaped structures of 200 to 400 nm in length? In addition, the World Health Organi-zation (WHO) eradicated this virus in 1980
a. Cowpox
b. Chicken pox
c. Swinepox
d. Smallpox
D
Smallpox is known to infect only humans and exists as two distinct subtypes, variola major, which causes the most severe disease (case fatality rates of 30%) and occurs mainly in Asia; and variola minor, which is associated with less severe disease (case fatality rates of 0.1% to 2%). Through an intensive vaccine campaign, the WHO declared natural-occurring variola virus era-dicated in 1980.
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a. insertion of a nucleotide into an exon b. deletion of an amino acid from the mRNA strand c. a frameshift mutation d. epigenetic changes to DNA e. a change in a termination codon
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Which type of plant can utilize the Calvin cycle?
A. C3, C4, and CAM plants B. CAM plants C. C3 plants D. C4 plants
Cladistic analysis of populations of blue wildebeest in Africa has helped to show that habitat fragmentation has led to a loss of ____.
A. evolution B. alleles C. genes D. gene flow E. mutations