Which of the following statements describes the lysogenic cycle of lambda (?) phage?

A) After infection, the viral genes immediately turn the host cell into a lambda-producing factory, and the host cell then lyses.
B) Most of the prophage genes are activated by the product of a particular prophage gene.
C) The phage genome replicates along with the host genome.
D) The phage DNA is copied and exits the cell as a phage.


C

Biology & Microbiology

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Which of the following is true of carbon?

A) It forms only polar molecules. B) It can form a maximum of three covalent bonds with other elements. C) It is highly electronegative. D) It can form both polar and nonpolar bonds.

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The process by which the base sequence of all or a portion of a DNA molecule is used to direct the synthesis of an RNA molecule is called ________.

A. replication B. reverse transcription C. transcription D. translation

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Why do organisms that share a common environment often also share common features?

a. Living in close proximity leads to inter-breeding of the species. b. They likely share common parasites as well, and the parasites are responsible for horizontal gene transfer between the species. c. Sharing a common environment means they face similar environmental pressures. d. Over time, species that cohabitate start to look alike.

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What is the most common bacterial cause ofconjunctivitis?

a) Neisseria gonorrhoeae b) Chlamydia trachomatis c) Haemophilus influenzae d) Streptococcus pyogenes

Biology & Microbiology