What information does this phylogenetic tree convey?
a. the length of time between speciation events separating these organisms
b. the full taxonomic classification of each organism named in this diagram
c. the order in which distinguishing characteristics evolved among these organisms
d. the relative fitness of each organism listed within its own environment
c. the order in which distinguishing characteristics evolved among these organisms
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The most important aspect of agar that makes it a useful ingredient for solidifying media for bacterial culture is
A. It provides an excellent carbon and energy source for bacteria. B. Bacteria are unable to break it down so it stays solidified. C. It melts at 100oC and solidifies at temperatures below 50oC. D. It provides an excellent nitrogen source for bacteria.
Which of the following is NOT a known effect
in the expression of Marfan syndrome? a. lanky, loose jointed skeleton b. weakened blood vessels c. calcium deposits in aorta d. excessive absorption of oxygen causing the blood cells to swell e. skin becomes inelastic
Which of the following statements about tissue transplants is true?
a. The source of graft rejection is T cell recognition of the MHC antigens on the transplanted cells. b. If transplants demonstrate a perfect match for all Rh antigens, then there is a 95% success rate. c. Successful transplants require a complete match of all MHC antigens. d. Xenotransplantation avoids the fundamental transplant mechanism of graft rejection. e. Skin can be successfully transplanted between siblings and other closely related family members
What is a possible cause of the chromosomal aberration called a "duplication"?
A) a chromosome fragment that breaks off and does not rejoin any chromosome B) nondisjunction C) exchange between non-homologous chromosomes D) unequal crossing over E) breaking of a chromosome fragment, then rejoining in a flipped orientation