In an Hfr strain, the F episome is integrated between genes A and B. When this Hfr mates with an F? strain, gene B is always transferred first to the F? cell. What is the last bacterial gene that could possibly (at least in theory) be transferred to the F? from the host chromosome?

A) a gene that is 90 minutes from gene A
B) a gene that is at 30 minutes from gene A
C) gene A
D) a gene that is at 60 minutes from gene A


C) gene A

Biology & Microbiology

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Which of the following could be considered a habitat island?

A. a person in line at the train station B. a lake surrounded by trees C. a patch of moss on a tree trunk D. All of the answer options are correct. E. None of the answer options is correct.

Biology & Microbiology

Which plants are characterized by a conducting system, the possession of cuticles, specialized stems, and roots, stomata, and, in many species, seeds?  

A.  liverworts B.  mosses C.  tracheophyte D.  horsetails E.  club mosses

Biology & Microbiology

Reiji Okazaki discovered what are now called "Okazaki fragments" produced during DNA replication. These

fragments are ____.

a. short lengths of new DNA on the leading strand b. RNA primers on the lagging strand c. RNA primers on both the lagging and leading strand d. short lengths of new DNA on the lagging strand e. RNA primers on the leading strand

Biology & Microbiology

Blood types A, B, AB, and O are determined by ________

A) the capacity of the blood to respond to infections B) the capacity of the blood to respond to transfusions C) carbohydrates on the surface of the white blood cells D) carbohydrates on the surface of the red blood cells

Biology & Microbiology