Darwin proposed that natural selection occurs in an environment by
A. producing a constant number of offspring while in that environment.
B. surviving for a fixed amount of time.
C. resisting the environment and keeping the environment from changing.
D. favoring those individuals with the most favorable acquired characteristics.
E. favoring heritable features that make the organism better suited to survive and reproduce.
E. favoring heritable features that make the organism better suited to survive and reproduce.
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You set up an EcoRI restriction digest for a sample of genomic DNA from an individual with a mutation in the ?-globin gene. You perform a Southern blot using the entire ?-globin gene as a probe
To your surprise, you notice a different pattern of bands in the affected individual – you have identified a new SNP! What can you conclude from the pattern of bands from the Southern blot below? A) The SNP resulted in the loss of an EcoRI site. B) The SNP resulted in the creation of a new EcoRI site. C) The SNP resulted in the loss of an exon. D) The SNP results in the creation of a new HindIII site. E) There was no change in the genomic DNA sequence.
Hay fever that occurs when people are exposed to pollen involves an excess release of IgE, which binds to ________ and causes them to ________.
A) pollen : stimulate the release of histamine B) macrophages : destroy the pollen whose by-products stimulate histamine release C) T helper cells : stimulate the proliferation of cytotoxic T cells D) mast cells : degranulate, releasing histamine E) mast cells : stimulate the proliferation of cytotoxic T cells
Select the best response to the question. ?Which of the following patients is at high risk of becoming ill from a pathogen with low virulence?
A)A patient with cancer undergoing chemotherapy. B) A patient with otitis media (ear infection). C) A patient who has had very few illnesses. D) A patient with a laceration.
Which parts of the atoms interact in a chemical reaction?
A. protons B. neutrons C. ions D. electrons E. isotopes