A single B lymphocyte can recognize multiple antigenic determinants
Indicate whether the statement is true or false
FALSE
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You are working in a laboratory that is studying a newly isolated virus. Your job is to culture the virus using in vitro methods. Upon observing your inoculated tissue culture specimen one day, you notice clumps of cells growing on top of the original monolayer of cells. Microscopic analysis of stained cells from the culture reveal an alteration in host cell membrane protein content and chromosomal structure. Based upon this information, you hypothesize that the virus you are studying is ________.
A. a viroid B. an oncovirus C. a bacteriophage D. a prion E. a satellite virus
Invertebrates on land use __________ or
__________ systems for gas exchange. Fill in the blank(s) with the appropriate word(s).
The vir genes of the Ti plasmid
a. are transferred to the plant cell. b. are an example of a classic bacterial system in which stimulation of a sensor protein causes automethylation and transfer of the methyl to the second protein. c. are activated by phenolic compounds released by plant wounds. d. are expressed constitutively. e. are not required for transfer of DNA.
The human genome is composed of approximately how many base pairs?
A) 3 billion B) 10 billion C) 30 billion D) 100 billion E) 1 trillion