Which of the following is true of normal microbiotia, but not of transient macrobiotic?
A) Normal microbiota are opportunistic pathogens.
B) Normal microbiota are on the human body.
C) Normal microbiota cause disease.
D) Normal microbiota are permanently present.
Ans: D) Normal microbiota are permanently present.
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In what types of organisms do plasmodesmata serve as a mechanism of cell-cell communication?
A. protists B. plants C. those types of organisms that spend only a portion of their life cycle in a multicellular state D. animals
The main form in which sugars are transported in the phloem sap is
a. glucose. b. lactose. c. starch. d. sucrose. e. fructose.
What change(s) can have detrimental effects on the human food supply?
a. 10%–35% of all U.S. crops are lost to insect damage each year. b. $10 billion per year are spent on insecticides by American farmers. c. Natural selection can create an "arms race" between pest species that feed on crops and pesti-cides developed by humans. d. All of the above.
There are ________ common amino acids used to synthesize proteins.
A. 25 B. 64 C. 61 D. 20