In Griffith's experiment involving the transformation of Streptococcus pneumoniae,
A) the R strain was virulent.
B) the S strain was virulent.
C) both the R and S strains were virulent.
D) the R strain had a protein capsule.
E) the S strain had a protein capsule.
B
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Plants are raised under artificial lights turned off and on by an electric clock. Some are given long periods of light, others short periods. This is an example of:
A. deductive reasoning B. a hypothesis C. inductive reasoning D. an experiment E. a theory
All cells in our body (e.g., a neuron or muscle cell) possess a type of protein that the immune system uses to identify them as our own cells. This protein is
A. CD4. B. lactoferrin. C. MHC I. D. MHC II. E. antigen.
Biologists are concerned about the long-term survival of northern elephant seals because ________
a. the population contains little genetic variability and could be vulnerable to selection pressures b. elephant seals are still hunted c. many individuals are emigrating to southern habitats and taking genetic diversity with them d. killer whales, whose populations are increasing in some areas, prey on elephant seals
Which of the following statements regarding the surface of the skin is FALSE?
A) It has sebum as a coating. B) It has normal microbiota. C) It has goblet cells. D) It is salty. E) It is acidic.