Consider conjugation in Escherichia coli. In which of the following matings would chromosomal genes be transferred most frequently?
A) F+ × F-
B) F- × F-
C) Hfr × F-
D) Hfr × F+
Answer: C
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In order to transfer gene a to an F- cell, the sex pilus must be in place for at least ____ minutes
a. 0 b. 6 c. 10 d. 14 e. 25
The integumentary system is responsible for all but which of the following?
a. protection against bacterial attack b. protection against abrasion c. synthesis of certain vitamins d. blood cell formation e. control of temperature and prevention of drying out
Pinpointing the location and size of tumors can be accomplished through ____
a. DNA probes b. biopsy c. x-rays d. MRI e. radioactive monoclonal antibodies
Several lineages of reptiles evolved from a common ancestral stem reptile, each adapting to different ways of life.
Answer the following statement true (T) or false (F)