What would result if a leech had a mutation causing it to secrete low levels of anticoagulants?
A. The pain of the leech bite would cause the leech to be detected.
B. The leech would have a hard time locating appropriate hosts.
C. The blood would stop flowing after a short time.
D. The leech would have a hard time remaining attached to its host.
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
Gather Content
· What do you already know about leeches?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
C. The blood would stop flowing after a short time.
Clarify Question
· What is the key concept addressed by the question?
o This question addresses leeches.
· What type of thinking is required?
o This question is asking you to analyze the information given, using logic, to dissect the problem and determine the answer.
Gather Content
· What do you already know about leeches?
o Leeches use chitinous, bladelike jaws to make an incision to access blood; they secrete an anticoagulant to keep the blood from clotting.
o Both the anticoagulant and the leech itself have made important contributions to modern medicine. Hirudo medicinalis is the medicinal leech.
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
o If a leech did not produce normal levels of anticoagulants, when it bit a host, the blood would soon clot and stop flowing.
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
o The question required you to analyze the information given, using logic, to dissect the problem and determine the answer.
o Did you recognize that leeches produce anticoagulants so that when they bite a host, the blood does not clot?
You might also like to view...
Spiny skinned organisms that have a water vascular system belong to the phylum:
a. Echinodermata. b. Chordata. c. Bryozoa. d. Arthropoda. e. Mollusca.
Although most hormones work at sites distant from where they are secreted, some work locally, such
as a. follicle stimulating hormone. b. prostaglandin. c. luteinizing hormone. d. thyroid stimulating hormone. e. adrenocorticotropic hormone
Small, fishlike marine chordates, pointed at both ends with no distinguishable head, in which the notochord runs the entire length of the nerve cord, are called
A. tunicates. B. arrow worms. C. acorn worms. D. lampreys. E. lancelets.
Sequence-tagged sites (STS) are used to assemble DNA maps from a given species. STSs are useful in this regard because
A. they generate DNA fragments of a reasonable size for mapping. B. they are only found in genes, not in noncoding DNA. C. each STS is found many times within the genome. D. they provide a way to order DNA fragments.