Diagram the life cycle for a blood fluke and identify all of the stages that the fluke goes through
Compare and contrast this life cycle to that of a beef tapeworm What will be an ideal response?
Concepts to Consider: The blood fluke life cycle starting with infection of human from swimming or
wading in contaminated water; sexual reproduction within the human host producing eggs (containing
embryos) that are excreted in the feces; development of the eggs into free-swimming larvae in
freshwater systems; infection of a freshwater snail; asexual reproduction within this host and the
release of large numbers of larvae into the surrounding water. Differences for the tapeworm life cycle
include mode of infection (eating poorly cooked beef); both hosts are vertebrates; no aquatic
component to the life cycle; no free-swimming larval stages. Similarities include two hosts; infection
of humans; release of embryos in human feces; infection due to contamination (of water or land area)
by human waste.
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True or false: sequences that are conserved (i.e., similar in many different organisms) are unlikely to be functionally important
A. true B. false
Scientists have created genetically modified organisms (GMOs) by isolating and then transferring the jellyfish gene for green fluorescent protein into pigs, bacteria, plants, and mice. The result was bioluminescent organisms! These experiments demonstrate that
A. genes can only be transferred to other organisms within the same species. B. genes have no difficulty crossing the species barrier. C. animal genes from one species will not function if transferred into other animals. D. jellyfish genes may be transferred into other aquatic ectotherms, but not mammals.
RNA polymerase binds to the promoter sequence in RNA
__________________ Indicate whether the statement is true or false.
Select all the ways lymph moves in one direction through lympatic vessels. Select all that apply
A) skeletal muscle contraction B) presence of one-way valves C) pumping of the heart D) movement of synergistic bacteria