Which of the following statements best describes Helicobacter pylori?
A) It is a gram-positive coccus that causes skin infections.
B) It is a gram-negative spiral that causes ulcers.
C) It lacks a cell wall and produces a lot of acid.
D) It can be detected by testing for cold agglutinins.
Answer: B) It is a gram-negative spiral that causes ulcers.
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In the preceding experiment, bacteria that form blue colonies on X-gal/IPTG LB agar containing antibiotic also contain
(a) a gene for antibiotic resistance. (b) an active lacZ gene. (c) an inactive lacZ gene. (d) both a and b.
Which one of the following pairings of an aneuploidy and the syndrome it causes is incorrectly
matched? A. X-chromosome monosomy (X and no Y) causes Turner syndrome. B. X-chromosome trisomy causes Klinefelter syndrome. C. Trisomy 21 causes Down syndrome. D. Trisomy 13 causes Edwards syndrome. E. Uniparental disomy causes Prader-Willi syndrome.
Gs? nucleotide exchange is stimulated by a ________, whereas Ras nucleotide exchange is stimulated by ________
Answer: GPCR/EGF receptor; Sos
Jess has A- blood type, has never received a blood transfusion, and never been pregnant. Antibodies against what blood antigens could be present in Jess' blood?
A. O and Rh antigens B. B antigens C. A antigens D. B and Rh antigens E. O antigens