A water-vascular system is characteristic of the phylum ____.

A. Nematoda
B. Annelida
C. Chordata
D. Mollusca
E. Echinodermata


Answer: E

Biology & Microbiology

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Many hyperthermophiles of Archaea are ________; however, Staphylothermus is a chemoorganotroph

A) chemolithotrophs B) mixotrophs C) parasites D) photoheterotrophs

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Using a hand puppet to feed a baby condor is done to promote on condors and prevent to humans.

A. habituation; operant conditioning B. imprinting; operant conditioning C. imprinting; habituation D. habituation; imprinting E. operant conditioning; imprinting

Biology & Microbiology

Imagine that a mutant mouse has a defect in the distribution of norepinephrine receptors, so that all the arteries and arterioles carry the type of norepinephrine receptor normally found around the brain and heart. What would you predict for this mouse in response to hemorrhage?

A. Blood vessels near the brain and heart will constrict, while blood vessels elsewhere will be dilated. B. Vasoconstriction near the brain and heart will prevent enough blood from reaching those organs. C. Blood vessels near the brain and heart will be dilated, while blood vessels elsewhere will constrict. D. Vessels throughout the body will stay dilated, resulting in inadequate blood flow to the brain and heart.

Biology & Microbiology

A deletion of a particular stretch of chromosome 15 can cause either Prader-Willi syndrome or Angelman syndrome, depending on

A. whether a nondisjunction event has occurred. B. whether or not the region is methylated properly. C. whether a translocation event has occurred. D. the parental origin of the normal and deleted chromosome.

Biology & Microbiology