Which of the following statements is NOT true?
a. All chordates have a notochord.
b. All chordates have pharyngeal pouches or gill
slits.
c. All chordates have a dorsal nerve cord.
d. All chordates are vertebrates.
e. Chordates are deuterostomes.
Answer: d
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This sequence of questions should help students understand how microbes were historically characterized and classified, how technology changed our perception of the microbial world,
the assumptions scientists made about prokaryotes, the unique features of archaea that distinguish this group of microorganisms from bacteria, and how fossils impact on our understanding of prokaryotic evolution on Earth. Prior to the advent of DNA sequencing technology and its application to the study of bacterial diversity and phylogeny, traditional taxonomic methods succeeded in characterizing thousands of bacterial species. As mentioned in the text, the cultured species represented less than 1% of the total number of bacterial species in nature. Knowledge of the nucleotide sequence for the gene encoding the small subunit of the ribosomal RNA (rRNA) provides little information about the metabolic capabilities of microorganisms found in soil and seawater other than what can be inferred from sequence similarity to 16S rRNA genes from cultured species. A. true B. false
In general, how are prokaryotic and eukaryotic cells different and how are they similar?
What will be an ideal response?
CREB is a stretch of DNA.
a. true b. false
Membrane proteins:
A. are sometimes covalently attached to lipid moieties. B. are sometimes covalently attached to carbohydrate moieties. C. are composed of the same 20 amino acids found in soluble proteins. D. have all of the properties listed above.