Anxiety about an upcoming final exam causes a student to experience an increase in blood pressure, dilation of the pupils, and a dry mouth. Which of the following nervous system responses is responsible for these physical symptoms?
A. Voluntary
B. Sympathetic
C. Limbic
D. Cognitive
Ans: B. Sympathetic
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Two organisms containing identical GC ratios are not necessarily related
Indicate whether the statement is true or false.
Imagine a chart showing the number of people in different age groups (0 to 5 years old) as blocks in proportion to the number of people in each age group
If each of these age blocks is shown stacked with the youngest at the bottom and the oldest at the top, what shape will the whole stack assume when there is a rapid population doubling time? A) expanding pyramid B) uniform column C) inverted pyramid D) hourglass
A different pattern of methylation in genes responsible for glucose and fatty acid metabolism is common in individuals _______________.
A. with cancer. B. conceived during famine C. exposed to chemicals in cigarette smoke D. with young parents E. of certain ethnic groups
Which of the following bacteria produce one of the deadliest bacterial toxins known?
A. Clostridium perfringens B. Clostridium difficile C. Clostridium tetani D. Clostridium botulinum E. Corynebacterium species