Which of these strategies does phage T7 use to ensure successful infection and replication within a host?
a. using host RNA polymerase to transcribe early proteins and then subsequently inhibiting host RNA polymerase activity
b. rapidly synthesizing an anti-restriction protein before the entire T7 genome has entered the cell
c. processing DNA concatemers using a head-full mechanism
d. both a and b
Answer: D
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By ignoring a checkpoint in the cell cycle, a cancer cell may
A. align chromosomes on the equator of the cell during metaphase. B. divide before its DNA is completely replicated. C. pull chromosomes apart during anaphase. D. divide after mutations are fixed. E. condense its chromosomes before mitosis.
ONE DIFFERENCE BETWEEN MITOSIS AND MEOSIS IS?
What will be an ideal response?
What occurs during the antigen detection stage of the antibody-mediated immune response initiated by T cell activation?
a. Cytotoxic T cells destroy body cells that are infected with a pathogen. b. Helper T cells activate an antigen-specific B cell to divide and secrete antibodies. c. A T cell displaying an antigen-specific T cell receptor (TCR) binds to the antigen on the surface of an antigen presenting cell. d. Helper T cells are activated by the TCR. e. A B cell degrades the pathogen and produces antigens.
What types of membrane proteins catalyze reactions in the extracellular fluid or within the cell?
a. receptor proteins b. channel proteins c. recognition proteins d. enzymes