Answer the following questions true (T) or false (F)
1. Men infected with Trichomonas vaginalis rarely have symptoms.
2. Most microbes need an environment that has a water activity of at least 0.90.
3. The starter culture used to make cheese determines the type of cheese produced.
1. TRUE
2. TRUE
3. FALSE
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The morphological species concept:
a. almost always incorrectly classifies species due to homoplasies. b. is still the most accurate species concept in use. c. groups species based on similar phenotype. d. was popular among early biologists but is hardly ever used anymore. e. groups species based on how they have changed through time.
During reactions catalyzed by oxidoreductases an electron donor is
A) oxidized. B) reduced. C) synthesized. D) degraded. E) unaltered.
Light serves two important functions for life on Earth. What is light's one source that sustains life, and what information does it provide organisms with?
a. energy; information about chemical life b. chemicals; information about physical life c. chemicals; information about surrounding life d. energy; information about physical life
Which of the following is NOT a function of pili?
a. cell adhesion b. defense by poking holes in other cells c. exchange of genetic material d. twitching motility