Which of the following is NOT correct regarding host defenses?
A) First line of defense blocks portals of entry.
B) Second line of defense include inflammation and phagocytosis.
C) Third line of defense is lymphocyte-dependent and specific.
D) Fourth line of defense provides long-term immunity.
Ans: D) Fourth line of defense provides long-term immunity.
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As big as it is, the ocean is nutrient-limited. If you wanted to investigate this phenomenon, one reasonable approach would be to _____
A) follow whale migrations in order to determine where most nutrients are located B) observe Antarctic Ocean productivity from year to year to see if it changes C) experimentally enrich some areas of the ocean and compare their productivity to that of untreated areas D) compare nutrient concentrations between the photic zone and the benthic zone in various marine locations E) contrast nutrient uptake by autotrophs in marine locations that are different temperatures
Which is NOT a shared characteristic of
parabasalids and diplomonads? a. heterotrophy b. flagella c. oxygen-poor or anaerobic habitats d. abundant mitochondria e. presence of a pellicle
Which action is an example of voluntary muscle contraction?
A) a push-up B) peristalsis C) a heartbeat D) stomach churning
If you are attempting to minimize the amount of mercury in your diet, you should eat
A) omnivores such as hogs. B) low-level carnivores such as tilapia. C) high-level carnivores such as tuna. D) herbivores such as cattle. E) producers such as fruits and vegetables.