In chordates, which mesoderm structure forms during gastrulation and provides structural rigidity along the dorsal anterioposterior axis of the embryo?
A. neural tube
B. archenteron
C. notochord
D. intestinal tract
E. epidermis
Answer: C
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Some plants under attack by insects can communicate this information to other parts of the same plant and to nearby plants via
A) vibrations in their roots. B) low-frequency sound waves. C) the release of chemicals into the air. D) the release of chemicals into their roots.
High temperatures can cause proteins in a cell to denature. This can be reversed by heat shock proteins that function as ________.
A. ribosomes B. chaperones C. proteasomes D. polymerases E. catalysts
Although Deinococcus-Thermus phyla stain Gram-positive, which reason(s) exclude them from this Gram type?
A. Their cell envelope includes an S-layer B. They have L-ornithine in their peptidoglycan C. Their plasma membrane has phosphatidylglycerol phospholipids instead of palmitoleic acids D. They lack teichoic acids
The cross GE/ge × ge/ge produces the following progeny: GE/ge 404; ge/ge 396; gE/ge 97; Ge/ge 103. From these data, one can conclude that ________
A) the G and E loci reside on the same chromosome over 50 map units apart B) the G and E loci are segregating independently C) the G and E loci assort independently D) the G and E loci are linked E) the G and E loci show complete linkage