By Golder Wilson
Supplies clinical scholars 500 questions, solutions, and reasons to arrange for the biochemistry and genetics sections of the USMLE Step 1. the hot variation comprises many new questions within the two-step scientific structure to simulate the USMLE Step 1.
Read or Download Biochemistry & Genetics: PreTest Self-Assessment & Review PDF
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Extra resources for Biochemistry & Genetics: PreTest Self-Assessment & Review
A. They are an integral part of transcription b. They are found both free in the cytoplasm and bound to membranes c. They are bound together so tightly they cannot dissociate under physiologic conditions d. They are composed of RNA, DNA, and protein e. They are composed of three subunits of unequal size 62. Guanosine triphosphate (GTP) is required by which of the following steps in protein synthesis? a. b. c. d. e. qxd 11/14/01 10:37 AM Page 45 Gene Expression 45 63. Erythromycin is the antibiotic of choice when treating respiratory tract infections in legionnaire’s disease, whooping cough, and Mycoplasma-based pneumonia because of its ability to inhibit protein synthesis in certain bacteria by a.
The most likely explanation for these findings is a. Defective transport from hepatic ER to the serum b. A mutation affecting the N-terminal methionine and blocking initiation of protein synthesis c. A mutation affecting the signal sequence d. Defective structure of the signal recognition particles e. qxd 11/14/01 10:37 AM Page 48 Gene Expression Answers 33. The answer is b. (Murray, pp 452–467. Scriver, pp 3–45. Sack, pp 1–40. ) The “genetic code” uses three-nucleotide “words,” or codons, to specify the 20 different amino acids (see the chart below).
D. e. They always yield overhanging single-stranded ends They recognize methylated DNA sequences They recognize triplet repeats They cleave both strands in duplex DNA They always yield blunt ends 24. DNA fingerprinting is used for paternity testing and forensic identification of suspects. Which of the following is the most accurate description of DNA fingerprinting? a. DNA can be isolated from blood, skin, or sperm and analyzed for variable patterns of restriction fragments arising from tandemly repeated sequences (microsatellites) b.
Biochemistry & Genetics: PreTest Self-Assessment & Review by Golder Wilson