Helicobacter pylori is a bacterial organism that causes ulcers and digestive disturbances. How might they survive the acid pH of the stomach?
A) They secrete buffers to neutralize acid.
B) They burrow under the mucus layer that covers the stomach epithelium.
C) They take over the parietal cells.
D) They release chemicals that decrease acid production in the stomach.
Answer: B
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From their formation to ejaculation, sperm cells take the following pathway:
A. seminiferous tubule, epididymis, rete testis, urethra, ejaculatory duct, ductus deferens. B. seminiferous tubule, epididymis, rete testis, ejaculatory duct, ductus deferens, urethra. C. seminiferous tubule, epididymis, rete testis, ductus deferens, ejaculatory duct, urethra. D. seminiferous tubule, rete testis, epididymis, ductus deferens, ejaculatory duct, urethra. E. seminiferous tubule, rete testis, epididymis, ejaculatory duct, urethra, ductus deferens.
Which type of roots are also known as prop roots?
A. Adventitious roots B. Aerating roots C. Aerial roots D. Contractile roots E. Coarse roots
Which of these bones form the cheekbones in the skulls of mammals?
A) nasal bones B) palatine bones C) fontanels D) zygomatic bones
Suppose you estimate the following regression of a Movie's ticket sales and the season of year (Summer =1 if in May, June, July, August, =0 otherwise) that movie's initial release was in: Sales = 295,342 + 40.24 Summer. You are willing to believe you have a random sample of store locations, and a sufficiently large sample size. Which statements are well justified by the regression results?
A. Moving the scheduled release of a movie from the winter to the summer will increase its sales by 40.24. B. Movies released in the summer tend to have higher ticket sales. C. Moving the Jurassic World release date to Christmas instead of 4th of July weekend, would have resulted in ticket sales of 295,342. D. Promotional activities increase the number of movie tickets sold holding other factors fixed.