Which area has the largest number of people living with HIV/AIDS?
A. Sub-Saharan Africa
B. Western Europe
C. Southeast Asia
D. North America
E. Carribbean
Answer: A
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When assembling a fish aquarium one must add a conditioner to the water that contains bacteria capable of metabolizing fish waste such as ammonia, nitrate, and nitrite that accumulates in the aquaria water. Which of the following components of signal reception and transduction is NOT required for the bacterial two-component regulatory system for metabolizing these nitrogenous waste products?
A. NarQ receptor B. NarL transcriptional activator C. a protein kinase D. metabolic enzymes E. ligand-gated calcium channel
All of the following are necessary for contraction to occur EXCEPT which one?
A) Calcium levels must increase in close proximity to the contractile proteins. B) ATP must be present. C) Troponin-tropomyosin complex must shift out of the way. D) Cross-bridges must form between actin and myosin. E) The troponin and tropomysin must slide relative to each other, shortening the sarcomere.
Which of the following is a product of meiosis and cytoplasmic division in seed plants that forms in an ovule and gives rise to an egg-producing gametophyte?
A. Sporangium B. Megaspore C. Microspore D. Endosperm E. Sporophyte
6H2S + 6CO2 6S0 + glucose
A) takes place under aerobic conditions. B) takes place under anaerobic conditions. C) The amount of oxygen does not make any difference.