Diatoms
A) are autotrophs with a glassy cell wall that contains silica.
B) are mixotrophs.
C) are heterotrophic protists that decompose dead plants and animals in freshwater habitats.
D) include the malaria parasite.
Answer: A
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Gases such as oxygen and carbon dioxide can pass through a plasma membrane by simple diffusion, because they are uncharged, nonpolar molecules.
a. true b. false
Which of the following is NOT a reason why growth rates in nature are slower than those in the lab?
a. Microbes in nature grow in mixed populations. b. Nutrient transport rates are slower in the environment. c. Distribution of nutrients throughout habitat is not uniform. d. Resources are frequently suboptimal.
Why are choanoflagellates considered to be the ancestor of animals?
A. similarities in cell structure. B. similarities in rRNA. C. similarities in DNA. D. similarities in embryonic development.
Pheromones
a. are social signals. b. are detected by the vomeronasal organ in reptiles and most mammals. c. may serve as sex attractants. d. are not detected or responded to by humans. e. include all EXCEPT “are not detected or responded to by humans.”