Molecules of tRNA are
A) 75 to 90 nucleotides in length.
B) single-stranded with secondary structure.
C) cloverleaf in shape.
D) synthesized with modified bases.
E) All of these
E
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It’s the ninth inning, and the bases are loaded. As the pitcher winds up to throw the ball, how does each tissue in his arm contribute to this critical pitch? The ___________ of his fingers grips the ball. His __________ sends instructions that trigger his ___________ to contract. His ______________ provides stability and transmits the force produced.
A. ectoderm; ectoderm; mesoderm; endoderm B. connective tissue; nerve tissue; muscle tissue; epithelial tissue C. epithelium; ectoderm; mesoderm; endoderm D. epithelial tissue; nerve tissue; muscle tissue; connective tissue
The processes illustrated in the models depicted above all result in which of the following?
A) Transcription B) An increase in genetic variation C) An increase in the chromosome number D) Horizontal gene transfer
Acute glomerulonephritis is due to:
A) deposition of immune complexes in the kidney B) destruction of glomeruli by Streptolysin O C) formation of cross-reacting antibodies D) invasion of the kidney by Streptococcus pyogenes
Which of the following series is arranged in the correct sequence for nitrogen fixation and its subsequent use?
A. atmospheric nitrogen; production of ammonia; use of bacterial nitrogenase; synthesis of proteins; conversion by plants or algae B. atmospheric nitrogen; use of bacterial nitrogenase; production of ammonia; conversion by plants or algae; synthesis of proteins C. atmospheric nitrogen; production of ammonia; use of bacterial nitrogenase; conversion by plants or algae; synthesis of proteins D. ammonia; conversion by plants and algae; production of atmospheric nitrogen; use of bacterial nitrogenase; synthesis of proteins E. atmospheric nitrogen; use of bacterial nitrogenase; conversion by plants or algae; production of ammonia; synthesis of proteins