Why is it necessary to take special safety precautions when using radioactivity?
A. Radioactive substances will ionize cells.
B. Radioactive substances have the potential to cause damage to living cells.
C. Radioactive substances decay.
D. Radioactive substances will perforate plasma membranes.
B. Radioactive substances have the potential to cause damage to living cells.
You might also like to view...
The activation of helper T cells is likely _____
A) when an antigen is displayed by a dendritic cell B) when a cytotoxic T cell releases cytokines C) when natural killer cells come in contact with a tumor cell D) in the bone marrow during the self-tolerance test E) when B cells respond to T-independent antigens
All vertebrates contain a similar pattern of organs, indicating that they are related to one another. This represents which of the following lines of evolutionary evidence?
A. fossil record B. homology C. convergent evolution D. biogeography E. development
In 1910, Thomas Hunt Morgan discovered a white-eyed fruit fly in his population of wild-type, red-eyed flies. This white-eye phenotype occurs:
A. in all male and female fruit flies every other generation. B. only in female fruit flies. C. only in male fruit flies. D. only in offspring from a white-eyed male and a red-eyed female. E. in one-half of the male offspring from a red -eyed heterozygous female and a white-eyed male.
Unusual cellular extensions called prosthecae are associated with which of the following groups of proteobacteria?
A) alphaproteobacteria B) betaproteobacteria C) gammaproteobacteria D) deltaproteobacteria E) epsilonproteobacteria