Which of these factors would have the least effect on heat transfer processes in animals?
A. internal insulation such as blubber
B. bone density
C. difference between body temperature and ambient temperature
D. external insulation such as feathers or fur
E. surface area of the body
Answer: B
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A flood that separates a population of frogs onto opposite sides of a lake is an example of a vicariance event that may result in allopatric speciation.
Indicate whether the statement is true or false.
Answer the following statements true (T) or false (F)
1. Plasmids can help bacteria grow faster. 2. The ability to transfer DNA via conjugation is a universal feature of E. coli strains. 3. Transformation is the transfer of genes from dead bacteria to live bacteria. 4. It has been difficult to create an effective vaccine against HIV because reverse transcriptase cannot correct its errors. 5. Viral genomes must always be excised from the bacterial chromosome before viral components can be produced.
A male peacock has enormous tail feathers that it uses in mating displays to attract females. While the tail feathers are an
A. The feathers require a lot of energy to produce. B. Bright feathers make males less susceptible to predation. C. The large tail feathers would make it easier to fly. D. The feathers make the male more attractive to other males. E. There are no disadvantages to having large tail feathers.
You, as a cell biologist, discover that there is strong evidence that chloroplasts, found in plant and algal cells, are descended from bacteria but not eukaryotes. What theory would explain this finding?
A) endosymbiont B) macroevolution C) bottleneck D) back to front