Ringworm is caused by a(n)
A) fungus.
B) cestode.
C) nematode.
D) protozoan.
E) trematode.
A
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Starting with citrate, which of the following combinations of products would result from three acetyl CoA molecules entering the citric acid cycle (see the accompanying figure)?
A) 1 ATP, 2 CO2, 3 NADH, and 1 FADH2 B) 2 ATP, 2 CO2, 3 NADH, and 3 FADH2 C) 3 ATP, 3 CO2, 3 NADH, and 3 FADH2 D) 3 ATP, 6 CO2, 9 NADH, and 3 FADH2 E) 38 ATP, 6 CO2, 3 NADH, and 12 FADH2
After removing some freshly baked cookies from the oven, you accidentally brush the side of the pan with your bare hand. Your reflexes kick in and you immediately draw your hand away. What is the proximate cause of this behavior?
A. For millions of years, your ancestors survived in part because they avoided damaging heat, and thus were able to pass on heat-avoiding genes to you. B. Drawing your hand away quickly when it encounters high heat prevents injury, thereby increasing your chances to survive and reproduce. C. Sensory receptors in the skin of your hand sent a signal to interneurons in your spinal cord, which subsequently signaled the motor neurons in your arm and hand to contract, drawing your hand away. D. You perceived the heat, judged that it would cause a burn if you left your hand in place too long, and made a conscious decision to pull your hand away.
Answer the following statements true (T) or false (F)
1. Two species that occupy identical realized niches will not be able to co-exist for an extended period of time. 2. Chemical defenses are found only among animals. 3. The mimicry of coral snakes by scarlet king snakes is an example of Batesian mimicry. 4. Fleas are endoparasites.
Marine bony fish have body fluids that are ________ to seawater, so they continuously drink seawater and actively pump out ________.
A. hypotonic; ions B. isotonic; ions C. hypertonic; iron D. isotonic; glucose