A tRNA molecule brings ________ to the ribosome during protein synthesis
A) a polypeptide B) mRNA C) RNA polymerase D) an amino acid
D
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A researcher is working to generate a new cancer drug. Thus far, he has identified a compound that can reduce the size of tumors in the lung. However, in order for the drug to work, the lung tumor has to be small. In addition, the tumor cannot have metastasized (spread to other areas of the body). Furthermore, he knows that the drug acts to prohibit the signaling from one tumor cell to another
tumor cell. Given the above information, this new drug prohibits: A. synaptic signaling between tumor cells. B. autocrine signaling between tumor cells. C. paracrine signaling between tumor cells. D. endocrine signaling between tumor cells.
If the sequence of one strand of DNA is CATTACGGG, then the complementary strand would be GTAATGCCC.
Answer the following statement true (T) or false (F)
The difference between direct and indirect immunofluorescence testing is that
A. Indirect testing determines the identity of an unknown antigen in a patient sample, whereas direct testing determines whether the patient has been exposed to an antigen as evidenced by the presence of antibodies in their sera. B. Direct testing adds antibodies directly to antigens, whereas indirect testing cultures the organisms first and adds fluorescent tags to the patient sample. C. Direct testing determines the identity of an unknown antibody in a patient sample, whereas indirect testing determines whether the patient is infected with a specific antigen. D. Direct testing determines the identity of an unknown antigen in a patient sample, whereas indirect testing determines whether the patient has been exposed to an antigen as evidenced by the presence of antibodies in their sera.
Staphylococcus is usually found in /on