The filament and basal body are associated with which of the following external structures found in some bacterial cells?
a. fimbriae
b. glycocalyx
c. pili
d. flagella
Flagella
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What might be the advantage to an ancestral cell if it maintained a photosynthetic bacterium within its cytoplasm rather than digest it?
A. It could now live in a highly oxygenated environment. B. It could now utilize hydrogen sulfide as an energy source. C. It could now use glucose as an energy source. D. It could now use photosynthesis to make its food.
You are working as a botanist in a tropical forest, and have located a small plant that has never been seen or classified before. You learn from your dissection of this plant that it has vascular tissue. Yet, over the lifespan of the plant as it grows and matures in your greenhouse, you observe that it never produces seeds. It does produce small cluster of spore-forming capsules on the underside
of structures that resemble leaves. You classify the plant as a: a. liverwort b. fern c. horsetail d. bryophyte e. club moss
In a centrifuged blood sample, which layer contains the red blood cells?
1.Hematocrit
2.Leukocytes
3.Plasma
4.Platelets
The basic unit of muscle contraction is known as the:a
sarcoplasmic reticulum. b. transverse tubule. c. sarcomere. d. sarcolemma. e. motor unit.