The blastopore is the ____
a. opening of the archenteron at the animal pole
b. opening of the archenteron at the vegetal pole
c. outer layer of the blastula
d. cavity in the blastula formed by invagination
e. region of the blastula establishing dorsal-ventral polarity
ANSWER: b
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The convergent evolution of lactose tolerance in Europe and Africa is evidence that ____ evolution can drive evolution
Fill in the blank with the appropriate word.
Which is true of leukocidins?
A. They are superantigens. B. They kill neutrophils. C. They make holes in host cell membranes. D. They bind to Fc regions of antibodies.
Most of the filtrate is reabsorbed through the walls of the:a
distal convoluted tubule. b. loop of Henle. c. proximal convoluted tubule. d. collecting duct. e. glomerulus.
Glycosaminoglycans and proteoglycans resist compression and are found in large abundance in joints of the body.
Answer the following statement true (T) or false (F)