Massive _____ changes have occurred over time as a result of continental drift, leading in many cases to mass extinction of various species.
What will be an ideal response?
habitat
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Cap
A. is involved in positive control. B. stands for cyclic amp protein. C. works in conjunction with cAMP. D. is involved in negative control. E. is involved in positive control AND works in conjunction with cAMP.
Why is it a good idea to immunize little boys against rubella?
A. As this is a sexually-transmitted disease, vaccinating girls AND boys early in their lives prevents the spread of the disease in adulthood. B. We want to achieve herd immunity, and there's no reason why only girls would be infected by this virus. By vaccinating the entire population, we achieve a higher degree of herd immunity than is possible by vaccinating only girls. C. Only boys get this disease, and one of the common complications is sterility. D. While this disease is quite strikingly symptomatic in girls, it is completely asymptomatic in boys. Boys can be carriers and transmit it easily to girls they are in close proximity to without realizing it through respiratory secretions. This can lead to large-scale and dangerous outbreaks in the female population.
In photosynthesis, water is used as a source of replacement electrons for _______.
a) the Calvin cycle b) the citric acid cycle c) photosystem II d) the electron transport chain
Which of the following is necessary for strong bones and teeth, nerve conduction, muscle contraction, and blood clotting?
A. sodium B. sulfur C. iron D. magnesium E. calcium