A new plant species is introduced to Daphne Major and produces small, thin seeds. This plant species is highly adapted to drought and after 5 years has replaced over 80% of the native plants that produce large seeds. How will this change affect the evolution of beak size in the medium ground finch population?
A. Small beaks will be favored under all rainfall conditions.
B. Small beaks will be favored in wet years and large beaks will be favored in dry years.
C. Large beaks will be favored in wet years and small beaks will be favored in dry years.
D. Large beaks will be favored under all rainfall conditions.
A. Small beaks will be favored under all rainfall conditions.
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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.
A particular sea bird has a Type 1 survival curve, and older female birds produce more eggs than younger birds. What is an evolutionary strategy of these birds?
a. young birds reach maturity rapidly b. reproduction is delayed c. birds reach maturity slowly d. both a and b e. both b and c
The Otariidae characteristics include
a. external ears. b. swimming with hind limbs. c. swimming with fore limbs. d. both a and c. e. both a and b.
Arrange the steps of antibody-mediated immunity in the proper order
1) Plasma cells secrete antibodies. 2) Helper T cells interact with B cells displaying the same antigen-MHC complex. 3) Contact with antigen. 4) Clones of B cells produced. 5) Fragmentation of antigen.
a. 3, 2, 5, 1, 4 b. 3, 5, 2, 4, 1 c. 1, 3, 5, 2, 4 d. 4, 3, 2, 1, 5 e. 5, 3, 4, 2, 1