Answer the following statements true (T) or false (F)
1. A single gene always encodes an enzyme.
2. RNA polymerase II of eukaryotes always requires more than one general transcription factor to initiate transcription.
3 The molecule mRNA, which contains the information to make a polypeptide, is constructed from a DNA template.
4. As part of the transcriptional unit, regulatory sequences are the sites where RNA polymerase and transcription factors bind to regulate transcription.
1. FALSE
2. TRUE
3 TRUE
4. FALSE
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A gram-positive bacillus, which grew on Tinsdale agar, is esculin hydrolysis–negative, urease-positive, and nonlipophilic. The organism can be identified as:
a. C. diphtheria. b. Corynebacterium glucuronolyticum. c. Corynebacterium xerosis. d. Corynebacterium ulcerans.
The most significant cells in graft rejection are
A. helper T cells. B. suppressor T cells. C. cytotoxic T cells. D. natural killer (NK) cells. E. delayed hypersensitivity T cells.
Which of the following closes "nicks" between DNA fragments, forming a covalent bond that ties or
joins the fragments together?
a. topoisomerase b. primase c. DNA polymerase d. helicase e. DNA ligase
Before a pathogen can be destroyed in the antibody-mediated process, a T helper cell must recognize
an __________ on the surface of a macrophage. a. antigen-MHC complex b. antibody c. interleukin d. HLA group e. antigen