Many algal species have life cycles consisting of alternating haploid and diploid generations. The most
common life cycle in brown algae consists of organisms that are
a. unicellular in the haploid stage and multicellular in the diploid stage.
b. multicellular in the haploid stage and unicellular in the diploid stage.
c. unicellular in both the haploid and diploid stages.
d. multicellular in both the haploid and diploid stages.
e. colonial in both the haploid and diploid stages.
D
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The force driving simple diffusion is _____, while the energy source for active transport is _____
A) the concentration gradient; ADP B) the concentration gradient; ATP C) transmembrane pumps; electron transport D) phosphorylated protein carriers; ATP
Which of the following is not a function of the midgut?
A. storage of ingested food B. chemical digestion of macromolecules by enzymes C. nutrient absorption D. nutrient absorption and chemical digestion of macromolecules E. All of these answer options are functions of the midgut.
Lichens, a combination of fungi and certain algae, live together in a close community interaction. The traditional understanding of lichen is one where the algae produces food for the fungi and the fungi supply the algae with a suitable home. Recently, however, it was found that the algae can live just fine on their own and are also found living "alone" in nature. The fungi on the other hand do
not appear to live on their own in the "wild." Which type of interaction characterizes the "traditional" understanding of lichen? Why? Which type of interaction does the new research suggest? Why? What will be an ideal response?
Which of the following is mismatched?
A. Bartonella henselae - cat-scratch disease B. Bartonella quintana - trench fever C. Yersinia pestis - plague D. Rickettsia typhi - Rocky Mountain spotted fever E. Coxiella burnetii - Q fever