Which of the following statements does NOT describe prokaryotic cells?
a. They are ten times smaller than typical eukaryotic cells.
b. They vastly outnumber all other types of organisms.
c. They are less versatile biochemically than eukaryotes.
d. They have much less internal membrane organization than eukaryotes.
Answer: c. They are less versatile biochemically than eukaryotes.
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Which statement best describes the phylogenetic relationship between protists, fungi, plants, and animals?
a. Fungi and animals share a common protist lineage, while plants arose from a different protist ancestor. b. Fungi and plants share a common protist lineage, while animals arose from a different protist ancestor. c. Animals and plants share a common protist lineage, while fungi arose from a different protist ancestor. d. Plants, animals, and fungi each arose from a different protist lineage. e. Plants, animals, fungi, and protists each arose from the same prokaryotic ancestor.
Which is the most commonly used system of virus classification?
a. Baltimore classification b. Linnean taxonomy c. classification by type of nucleic acid and capsid d. binomial nomenclature
Expansins are proteins that loosen up cell walls so cells can elongate. Auxin is thought to activate expansins by
A) aligning cellulose microfibrils. B) activating protons pumps to decrease pH in a section of the cell wall. C) depositing lignin molecules between cellulose fibrils. D) increasing turgor pressure. E) increasing pectin hydration.
The majority of otitis media in children is mainly due to infection with
A. Streptococcus pneumoniae. B. Streptococcus pyogenes. C. Branhamella (Moraxella) catarrhalis. D. Streptococcus agalactiae. E. Staphylococcus saprophyticus.