Four of the five fertility control methods listed below
are related by similar effectiveness. Select the
exception.
a. the Pill
b. tubal ligation
c. vasectomy
d. douching
e. IUD
Answer: d
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Which of the following statements is TRUE?
A) Lambda is a temperate phage that infects Escherichia coli. B) Lambda is a linear double-stranded DNA phage. C) Lambda is replicated by the rolling circle mechanism. D) Lambda is a temperate phage that replicates its double-stranded DNA genome with a rolling circle mechanism.
Alders are trees with symbiotic nitrogen fixing bacteria in their roots. This enables alders to be a key part of _________ in recently glaciated areas in Alaska.
A. intermediate disturbance B. competition C. primary succession D. inhibition E. secondary succession
Which of the following is TRUE of the
immediate impact of Mendel’s publication in 1866 of the basic laws of inheritance?
a. it gave Darwin the insight he needed into the mechanism of variation b. it started a genetic revolution c. it made Mendel one of the most famous scientists of his day d. it did more than of these things (a - c) e. it had no immediate impact
In an F+ × F? conjugation, the donor is the ________ strain.
A. F? B. neither F+ nor F? (there is no exchange) C. F+ D. both F+ and F? (it is a reciprocal exchange)