Within a negative feedback loop,
A. the stimulus sends data to the control center.
B. the control center detects a change in the internal environment.
C. the sensor causes an effector to return conditions to normal.
D. the effector causes a response.
E. the sensor sends data to the control center.
Answer: E
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Answer the following statement(s) true (T) or false (F)
1. The axon of a neuron can only communicate with other neuronal cells. 2. Neurons are the only electrically-active cells. 3. When a neuron is not firing, the sodium-potassium pump is inactive. 4. Humans are unique among animals due to our highly-evolved repertoire of sensory receptors. 5. A single type of receptor is responsible for detecting all tactile pressure in humans.
Which viral life cycle would result in a quicker death for an infected cell?
A. The prophage cycle B. The retroviral cycle C. The lysogenic cycle D. The lytic cycle
Vertebrate jaws evolved from _____
a. gill supports c. scales b. ribs d. teeth
You have received the first hepatitis A vaccine. It was required for your mission trip to Nicaragua in Central America, where hepatitis A is common. However, you never went back for the booster shot of the vaccine, which should have been received within 6 months of the initial vaccination. What statement accurately reflects your present immunity to this pathogen?
A. Not a problem because at any time, in a year, 5 years, etc., you can go get the booster vaccine for hepatitis A and be fully covered by immunity. B. You are at risk to get hepatitis A since your immune status is only partial. Not enough immune memory cells were produced since you received one dosage of vaccine, so you are likely to get the disease when exposed to the virus. C. This is not a problem because the second dosage is just extra protection. Your immune status would be very high. D. The one dosage is not enough because it only activated humoral immunity. The second dosage is used to activate cell-mediated immunity. The combination of the two immune responses gives you 100% coverage of immunity to hepatitis A.