Measles viruses are capable of inactivating host defenses by
A) producing leukocidins.
B) destroying complement proteins.
C) producing superantigens.
D) suppressing the immune system.
Ans: D) suppressing the immune system.
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Most prokaryotic genomes are double-stranded circular DNA
Indicate whether the statement is true or false.
It could be said that today's Australian marsupials and today's placental mammals have
A. undergone divergent evolution. B. undergone selective advantage. C. undergone heterozygote advantage. D. undergone convergent evolution. E. developed homologous structures.
Condensation of DNA yields the 30 nm filament. This filament:
A. is the most compact form of eukaryotic DNA. B. is moderately condensed DNA, as facilitated by H1 and the N-terminal tails. C. is also called the chromosomal scaffold. D. includes tetranucleosomes, each 30 nm in diameter. E. would not include histone variants.
The transfer of energy from a photoexcited electron to another electron of an adjacent pigment molecule is known as
A) photoexcitation. B) quantum leap. C) photophosphorylation. D) resonance energy transfer. E) photorespiration.