B cells can generate antibodies with over 1010 different antigen-binding sites. How do so many different antibodies fit onto a single B cell?
A. B cells have wavy, invaginated plasma membranes to provide more surface area.
B. B cells have long flagella-like extensions to provide more surface area.
C. B cells are unusually large cells.
D. They don't-each B cell makes only a single variety of antibody.
Answer: D
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Based on the principle of species individuality, how would you predict that climate change would affect the geographical range of species within a community?
A. Each species would shift its range in a unique manner, according to its physiological needs. B. All species in the community would migrate together as a "superorganism", because all species are connected. C. Assemblages of species would migrate together in predictable groups. D. Only the competitively dominant species would shift their ranges; less competitive species cannot adapt to climate changes.
Uncontrolled cell division can be referred to as which of the following?
a. diabetes b. atherosclerosis c. cancer d. mitosis
Which of the following is the best definition of sympatric speciation?
a. species that evolve due to geographical distance b. mechanical isolation acts to prevent speciation c. breeding behavior that prevents the organisms from breeding due to differences in their breeding time d. ecological isolation e. divergence within a population leads to speciation in the absence of a physical barrier to gene flow.
Increases in elevation are accompanied by decreases in temperature
The rate at which temperature drops as elevation increases is referred to as the dry adiabatic lapse rate, which gives a drop in temperature of rising unsaturated air of about 10°C for every 1000 meters. If the temperature is 25°C at the base of the mountain, what temperatures do organisms experience 3000 meters upslope? A) 5°C B) 0°C C) -5°C D) -15°C