Which type of reproduction involves the growth of a new plant on the margin of a leaf that eventually falls to the ground and grows independently?
a. grafting
b. fragmentation
c. apomixes
d. somaclonal section
Ans: b. fragmentation
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Which of the following is not caused by a protozoan?
A. African sleeping sickness B. Cryptococcosis C. Both cryptosporidiosis and cryptococcosis D. Cryptosporidiosis
Which of the following statements best describes the effects of caffeine on the body?
A. Caffeine is only water-soluble, not fat-soluble, so it is less likely to be absorbed into the bloodstream. B. Caffeine is considered a psychoactive drug because it changes brain function. C. Caffeine cannot readily cross the plasma membrane into body cells, so all effects are short-lived. D. Caffeine is a diuretic and can cause extreme water loss. E. In the brain, caffeine activates receptors for adenosine and blocks the action adrenaline.
The relationship between biomass and primary productivity is that:
a. biomass is the rate of primary productivity b. biomass is the inverse of primary productivity c. biomass is the natural log of primary productivity d. primary productivity is the inverse of biomass e. primary productivity is the rate at which biomass is produced
Which of the following genera is an endospore former?
A) Escherichia B) Bacillus C) Staphylococcus D) Streptococcus E) Mycobacterium