Which of the following cannot be infected by viruses?
a. algae
b. bacteria
c. animals
d. all of these can be infected by viruses
Ans: d. all of these can be infected by viruses
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The characterization of prions demonstrated that:
A. this viruslike structure can cause disease. B. secondary structure of a prion can cause disease. C PrPC causes disease. D. this viruslike structure and secondary structure of a prion can both cause disease. E. secondary structure of a prion and PrPC both cause disease.
If the DNA triplets were ATG and CGT, the mRNA codons would be
a. AUG and CGU. b. ATG and CGT. c. UAC and GCA. d. UAG and CGU. e. UAU and GCA.
The compensation depth refers to:
a. the depth at which seaweed growth compensates for grazers. b. always 3 times the secchi disk depth. c. the depth which provides only enough light for photosynthesis but not growth. d. the depth where competition excludes a species. e. the depth at which phytoplankton dissolve.
Which of the following is NOT a part of an antibody molecule?
a. light chain b. heavy chain c. antigen-binding site d. C and V regions e. epitope