What is the role of RAG1 and RAG2 in immunoglobin rearrangement?
What will be an ideal response?
RAG1 and RAG2 bind to RSS sites that flank the sequences to be removed and cleave the DNA to produce the 3'-OH at either end. The 3'-OH will act as the nucleophile in the following transesterification reaction.
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One type of archaeon, Haloquadratum walsbyi, is shaped like a postage stamp with dimensions of 2 µm x 3 µm x 0.25 µm. What advantage would this shape provide?
A. This shape is more conducive to the formation of biofilm communities. B. This shape increases the surface to volume ratio enabling more efficient nutrient uptake. C. This shape is difficult for phagocytic cells to attach to and engulf. D. This shape enables this bacteria to float on surfaces and obtain better light exposure.
The cell in the accompanying illustration is in ____
a. prophase I. b. metaphase I. c. anaphase I. d. prophase II. e. anaphase II.
The methanogenic archaeans are __________ that
pull electrons from __________. a. chemoautotrophs; oxygen b. chemoheterotrophs; carbon dioxide c. chemoautotrophs; water d. chemoheterotrophs; methane e. chemoautotrophs; hydrogen gas
Which of the following is NOT a target of drugs that inhibit protein synthesis?
A) the shape of the 30S ribosomal subunit B) interference with alanine-alanine bridges C) the enzymatic site of the 50S ribosomal subunit D) movement of the ribosome from one codon to the next E) the tRNA docking site