A specific chemical product of microbes, plants, and some animals that is poisonous to other organism is called a toxin.
a. true
b. false
a. true
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Possible gamete genotypes produced by an individual of genotype PpDd are
a. Pp and Dd. b. all PpDd. c. PD and pd. d. PD, Pd, pD, and pd.
Why are ferns considered incompletely adapted to the terrestrial environment, when compared with other plants?
A) They lack vascular tissue. B) Their sperm are flagellated. C) The gametophyte generation is dominant. D) They lack cuticle.
Respond to the following statements in reference to the five items listed below. Answers may be used more than once or not at all.
A. An Rh+ molecule in the body of an Rh woman is an example of these. B. These bind, as in a lock-and-key mechanism, to foreign proteins. C. D. These directly attack the foreign cells of an incompatible skin graft. E. These produce immunoglobulins in response to the reinvasion by a virus. F. Proteins produced by these bind to bacteria and viruses in the blood.
Which of the following is not generally true about fatty acids produced by microorganisms?
A. Gram-positive bacteria often make cyclopropane fatty acids. B. Fatty acids are monocarboxylic acids. C. Fatty acids have long alkyl chains. D. All of the choices are correct.