Why are leeches used in the medical field?
What will be an ideal response?
Saliva of bloodsucking leeches contains a protein that prevents blood from clotting while the leech feeds. For this reason, doctors who reattach a severed finger or ear sometimes apply leeches to the reattached body part. Action of the leeches prevents clots from forming inside the newly reconnected blood vessels.
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Which of the following serves as a connection between the nervous and endocrine systems?
A. hypothalamus B. pineal gland C. thyroid gland D. pancreas E. adrenal gland
A researcher wants to introduce the human gene encoding tissue plasminogen activator (used to dissolve blood clots) into a mammal so that the protein will be secreted into the milk of the mammary gland. What is required for the researcher's success?
A. The gene should be placed a considerable distance away from the promoter of a gene that is expressed in mammary cells. B. The gene should be placed next to the promoter of a gene that is expressed in mammary cells. C. The gene should be placed a considerable distance away from the promoter of a gene that is expressed in multiple types of cells. D. The gene should be placed next to the promoter of a gene that is expressed in multiple types of cells. E. The gene should be inserted in place of the promoter of a gene that is expressed in multiple types of cells.
In bacteriophage T4, all rIIA mutants are found to complement all rIIB mutants. However, rIIA mutants fail to complement other rIIA mutants, and rIIB mutants fail to complement other rIIB mutants
Furthermore, mutants with deletions that span both rIIA and rIIB complementation groups do not complement either A or B mutants. What do these data mean, and what do the complementation groups represent?
Which term best describes the relationship between humans and E. coli, which produces vitamin K in the intestines?
A) commensalism B) mutualism C) symbiosis D) parasitism