Describe why many systematists adopt the principle of parsimony?
What will be an ideal response?
The analysis of character traits is complicated based on the number of possible phylogenetic trees that
could be produced from data. The principle of parsimony suggests that the best phylogenetic tree is the
one that hypothesizes the smallest number of evolutionary changes needed to account for the
distribution of character states within a clade.
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Your patient was cut by a rusty nail. You vaccinate her for tetanus. How does one of her B cells produce antibodies against C. tetani?
A. Each antigen is coded for by a unique gene in the human genome; the correct gene is activated to produce the antigens against C. tetani. B. Recombination of different gene segments in B cells after exposure to C. tetani creates a unique structural gene. The cell then produces lots of that specific antibody. C. Post-translational modification of a generic antibody protein changes it from a generic form to the correct specialized form against C. tetani. D. Recombination of different gene segments in maturing B cells creates a unique structural gene. Upon exposure to C. tetani, the cell is stimulated to produce lots of the specific antibody expressed by that gene.
Body Mass Index (BMI) is
A. calculated by determining a person's weight (without clothing) in pounds and barefoot height in feet. B. a person's weight in kilograms divided by their height in meters squared. C. a person's weight in pounds divided by their height in feet squared. D. equal to approximately 10% of your total daily Calorie intake.
Which of these vascular tissue cells is alive but lacks a nucleus?
A. vessel element B. tracheid C. companion cell D. sieve-tube members
Regulation of integrin-mediated adhesion can regulate cell movement.
a. true b. false