One of the reasons that viruses are such effective infectious organisms is their ability to gain entry into host cells. Which component of a virus is primarily responsible for this feat?
A) flagellae
B) reverse transcriptase
C) single stranded RNA
D) viral envelope
D
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If a species is absent from a particular region, which are the reasonable explanations for its absence? Check all that apply.
_____ It evolved elsewhere and never dispersed to the region in question. _____ It was once found in the region in question, but became extinct there due to climactic changes. _____ It was once found in the region in question, but migrated to other regions _____ It was once found in the region in question, but was eradicated by humans.
The structure of a DNA molecule is analogous to a _____
a. paper clip b. ladder c. fork d. rope e. coiled spring
A scientist studying evolution of peppered moths (Biston betularia) in Michigan observed that the percentage of melanic moths increased by around 2% from 1960-1961. Has evolution occurred in this population?
A. No, because melanism wasn't adaptive at that time. B. Yes, because the frequency of melanic moths decreased. C. No, because the frequency of the melanic moths did not change enough to be considered evolution. D. Yes, because the frequency of the melanic moths in the population changed over time.
The most important electron carrier in cellular respiration is ________
Fill in the blank(s) with correct word