Which gas is increasing in the atmosphere and
intensifying the greenhouse effect?
a. carbon dioxide
b. carbon monoxide
c. ozone
d. nitrogen
e. oxygen
A
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Cells of the outer surface of a sponge obtain nutrients by ____
a. absorbing food that diffuses from the central cavity b. capturing food in their microvilli c. absorbing food distributed by amoeboid cells d. phagocytosing bacteria and other small food items e. poisoning small fish that contact them
Which of the following infectious agents and means of disposal are mismatched?
A. Carcasses of animals that died of anthrax must be incinerated to avoid endospores entering the soil. B. Drums made with animal hides should be treated with sterilizing gas to eliminate endospores. C. Mosquito bed nets must be washed in bleach weekly to eliminate any residual Plasmodium. D. Coagulation factors purified from blood must be heat-treated to destroy HIV.
Matching. Choose the one most appropriate answer
for each. 1. ___ compartmentalization 2. ___ effector 3. ___ habitat 4. ___ interstitial fluid 5. ___ apoptosis 6. ___ plasma 7. ___ stimulus 8. ___ tissue A. form of energy that a receptor can detect B. where an organism lives C. muscles and glands are examples D. plant response to attack E. fluid that bathes all cells F. fluid portion of the blood G. programmed cell death H. groups of cells with a common function
What does sampling error refer to?
A) the difficulty in accurately measuring results that are incalculable B) the differences between a group of experimental subjects and the population as a whole C) the experimental results that do not support the hypothesis being tested D) the intentional biases on the part of researchers