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 freeswimming
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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A type of fungi that has been long useful for baking, brewing, and wine making, and is now becoming very important in genetic research is _____.
Fill in the blank(s) with the appropriate word(s).
From his experiments, Mendel concluded that each individual carries two factors, or ____, that govern the inheritance of each trait. Different versions of each factor are known as ____
a. alleles; gene markers b. genes; loci c. alleles; genes d. genes; alleles e. gene markers; genes
Which molecules diffuse into the lymph
vessels during absorption in the small intestine?
a. simple sugars b. triglycerides c. amino acids d. nucleotides e. all of these
The oldest part of the vertebrate skull is the splanchnocranium
a. true b. false