Which cell is responsible for inflammatory response?
Answer: Basophil.
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Which of the following statements is true?
A. Integrins and cadherins facilitate cell adhesion to extracellular substrates. B. Cadherins on the surface of animal cells permit the adhesion of cells to other cells. C. Cadherins are used by plant cells to attach the plasma membrane to the cell wall. D. Integrins on one cell attach to cadherins on another cell to promote cell adhesion.
A trait that is adaptive in one context and later turns out to have adaptive value in a different context is called ____
a. paedomorphic b. heterochronic c. allometric d. an exaptation e. endemic
The combination of DNA and protein in the nucleus of a eukaryotic cell is called:
a. nucleoplasm b. plasmids c. nucleoids d. chromatin
An extraterrestrial organism (ET) is discovered whose basic cell biology seems pretty much the same as that of terrestrial organisms except that it uses a different genetic code to translate RNA into protein
You set out to break the code by translation experiments using RNAs of known sequence and cell-free extracts of ET cells to supply the necessary protein-synthesizing machinery. In experiments using the RNAs below, the following results were obtained when the 20 possible amino acids were added either singly or in different combinations of two or three: RNA 1: 5?-GCGCGCGCGCGCGCGCGCGCGCGCGCGC-3? RNA 2: 5?-GCCGCCGCCGCCGCCGCCGCCGCCGCCGCC-3? Using RNA 1, a polypeptide was produced only if alanine and valine were added to the reaction mixture. Using RNA 2, a polypeptide was produced only if leucine and serine and cysteine were added to the reaction mixture. Assuming that protein synthesis can start anywhere on the template, that the ET genetic code is nonoverlapping and linear, and that each codon is the same length (like the terrestrial triplet code), how many nucleotides does an ET codon contain? (a) 2 (b) 3 (c) 4 (d) 5 (e) 6