The only single-celled organisms are prokaryotes, such as archaea and bacteria.
a. False because some eukaryotes, including protista, are single-celled.
b. False because some prokaryotes are multicellular.
c. True because prokaryotes are the simplest cell form.
d. False because all single-celled organisms are prokaryotes.
e. True because all eukaryotes are multicellular.
Answer: a. False because some eukaryotes, including protista, are single-celled.
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A student observes a wormlike organism crawling about on dead organic matter. Later, the organism sheds its outer covering. One possibility is that the organism is a larval insect (like a maggot)
However, it might be a member of the phylum ________, and one way to distinguish between the two possibilities is by looking for the presence or absence of ________. A) Platyhelminthes; a cuticle of chitin B) Nematoda; an alimentary canal C) Annelida; a body cavity D) Nematoda; a circulatory system E) Annelida; muscle in the body wall
Another name for programmed cell death is
A) necrosis. B) perforation. C) apoptosis. D) cellular degradation.
What products of nonstructural genes are never translated?
A. transfer RNA B. ribosomal RNA C. messenger RNA D. transfer RNA and ribosomal RNA E. ribosomal RNA and messenger RNA
Your friend examines an ivy vine growing on the side of a campus building and says, "Look - some of the branches on this plant have a different morphology. The leaf shapes and patterning are different, and there are flowers on some branches but not others. There must have been a mutation!" You respond,
A. "No, those branches have just undergone phase change. Now they're in the adult form, and have become competent to respond to flowering signals." B. "No, those morphological changes are just evidence that this plant's environment has changed during its lifetime." C. "I think you're right. Maybe there was a mutation in the LEAFY (LFY) gene, and the loss of LFY has promoted flowering and had pleiotropic effects on leaf morphology." D. "I think you're right. Maybe the embryonic flower (emf) gene is being overexpressed, and that's causing flowers to form."