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
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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.
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
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.
What is the most common bacterial cause ofconjunctivitis?
a) Neisseria gonorrhoeae b) Chlamydia trachomatis c) Haemophilus influenzae d) Streptococcus pyogenes