Which pair of structures, found in different organisms, both serve to increase the absorptive surfaces of the intestines?
a. choanocytes and gastric ceca
b. proventriculus and villi
c. choanocytes and proventriculus
d. typhlosoles and villi
Answer: d. typhlosoles and villi
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Normal white blood cells (called B cells) and cancerous B cells that cause leukemia both carry a unique surface protein called CD-19
a. True b. False Indicate whether the statement is true or false
Parasitism is a density-independent factor of population control
Indicate whether the statement is true or false.
Which phase of mitosis involves the splitting or "pulling apart" of chromatids?
a. telophase b. anaphase c. metaphase d. prophase
In rats, gene B produces black coat color if the genotype is B-, but black pigment is not produced if the genotype is bb. At an independent locus, gene D produces yellow pigment if the genotype is D-, but no pigment is produced when the genotype is dd. Production of both pigments results in brown coat color. If neither pigment is produced, coat color is cream. The genotype of parents of litters with the following phenotype distribution 3 brown, 3 yellow, 1 black, 1 cream is:
a. BBDD x bbdd b. BbDd x bbDd c. BBdd x bbdd d. BbDd x bbdd