What is the main form of nitrogenous waste released by mammals to their environment?
a. amino acids
b. urea
c. ammonia
d. nitrate
Answer: b. urea
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Four of the five answers listed below are
examples of mutualism. Select the EXCEPTION.
a. plants and pollinators b. plants and seed dispersal by fruit-eating animals c. mycorrhizae d. phorid flies and red fire ants e. anemone fish and anemones
Which one of the following is NOT an example of behavior?
A. A plant bending toward a light B. A student sleeping in class C. The wind rustling fallen autumn leaves D. A cat purring
Chromosomes that have replicated consist of two copies that are still joined to each other. The two copies are referred to as a pair of
What will be an ideal response?
Which are the first to attack cancer cells and virus-infected cells?
A. cytotoxic T-cells B. suppressor T-cells C. delayed hypersensitivity T-cells D. helper T-cells E. natural killer (NK) cells