Prokaryotic cells lack
(a) DNA.
(b) a true nucleus.
(c) a cell wall.
(d) none of the above.
(b) a true nucleus.
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A rootless, green plant is found growing on the branches and trunks of rainforest trees, but lacks any apparent adaptation for collecting rainwater. This plant is most likely _____
A) an epiphyte B) a nitrogen-fixing plant C) a carnivorous plant D) a symbiotic plant E) a parasite
A rise in oxygen in Earth's air and seas put organisms that engaged in _____ at a selective advantage
a. fermentation b. photosynthesis c. sexual reproduction d. aerobic respiration e. anaerobic respiration
The differentiation of the sex of an embryo
A. occurs about month 4 of fetal development. B. is determined by the presence or absence of the Y-chromosome and its genes. C. occurs at conception. D. is highly variable from one embryo to another.
Which of the following taxonomic categories are normally included in the general classification of microorganisms?
A. Domain Bacteria B. Kingdom Protista C. Domain Archaea D. All of the above are correct.