Phyla Ascomycota and Basidiomycota are considered ____ because they share a more recent common ancestor with
each other than either does with any other group.
a. sister taxa
b. homoplastic
c. homologous
d. paraphyletic
e. monophyletic
a
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Which statements about the complement system of vertebrates are correct? (Check all that apply.)
_____ The complement system is a part of the immune system of vertebrates. _____ The complement system consists of approximately 30 different proteins that circulate in the plasma. _____ If these proteins encounter the cell wall of a bacteria or fungi they form aggregations and eventually produce a pore that leads to the destruction of the invading cells. _____ Although complement proteins attack invaders, they are not involved with histamine release. _____ The complement system produces antibodies to bind invading cells.
How many HLA haplotypes does each human have?
a. one b. two c. three d. four e. five
G protein-linked receptors are transmembrane proteins that convert a(n) extracellular hormone signal into an
intracellular signal that affects certain cell processes. Indicate whether the statement is true or false.
When homologous chromosomes cross over, what occurs?
A) Two chromatids get tangled, resulting in one re-sequencing its DNA. B) Two sister chromatids exchange identical pieces of DNA. C) Corresponding segments of non-sister chromatids are exchanged. D) Maternal alleles are "corrected" to be like paternal alleles and vice versa.