Some tRNA often contains sections of noncomplementary, unusual bases (i.e., other than U, C, A, and G), which are added after transcription. What area of the tRNA would never contain such odd bases in a living organism?
What will be an ideal response?
They would never be found in the anticodon because there would be no way to pair with any codon of the mRNA.
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How do T cells contribute to the immune response?
A. through the production of antibodies B. through cell-mediated immunity C. by activating the complement system D. by removing pathogens by phagocytosis
In a typical sequencing reaction, the amount of dNTPs is much greater than of the ddNTPs. Predict the results if equal amounts of both types of nucleotides were used in each reaction. After gel electrophoresis and visualization:
A. mostly long fragments would be present and no sequence could be read close to the primer. B. mostly short fragments would be present and only sequences very close to the primer could be read. C. the sequence could be read normally; the dNTP/ddNTP ratio does not affect the products of the reaction. D. only the purine reactions would show termination and be read from the gel. E. no bands would be visible because the high concentration of ddNTPs would inhibit the activity of the polymerase.
During elongation, the polypeptide is removed from the tRNA in the P site and transferred to the amino acid in the A site
Indicate whether the statement is true or false
Cell-mediated immune responses, such as attacking and killing microorganisms or host cells that are damaged or infected, are carried out by:
a. lymphocytes of the thymus-derived (T) class. b. lymphocytes of the bone marrow–derived (B) class. c. neutrophils. d. nasophils.