The transfer of genes during bacterial conjugation involves rigid, tubular appendages called
A. flagella.
B. sex pili.
C. periplasmic flagella (axial filaments).
D. fimbriae.
E. cilia.
Answer: B
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While in South America, you come across what you think are two groups of birds in the same location. They are nearly identical aside from their color
After years of observation, you conclude that the birds eat similar diets and share similar behaviors but do not reproduce with each other. These groups of birds appear to be an example of A. a single biological species. B. a single ecological species. C. a ring species. D. two different species on the basis of the ecological niche occupied. E. two different species on the basis of reproductive behavior.
What do you know about phosphorylation? What other information is related to the question?
What will be an ideal response?
Restriction enzymes
a. work at specific base sequences b. function only at “sticky ends.” c. produce uniform lengths of DNA. d. function in viruses. e. are produced by viruses to break down bacterial DNA.
Why is the work of Sir Isaac Newton considered so revolutionary?
a. because he promoted only theory, but not experimental work b. because he promoted only experimental work, but not theory c. because he worked during a period when religion and superstition were dominant d. because he worked during a period whe