____ must have been the first eukaryotic cells
a. Archaea
b. Bacteria
c. Protists
d. Fungi
e. Microplants
C
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The difference between deoxyribose and ribose is that ribose
a. is a six-carbon sugar and deoxyribose has only five carbons. b. bonds only to thymine, not uracil. c. has one more oxygen atom than deoxyribose has. d. is all of the above.
To determine the nucleotide sequence in DNA, scientists now use
a. electron microscopy. b. antibiotic resistance. c. automated DNA sequencing. d. radioactive tracers. e. viruses.
During an active HIV infection, which cell type numbers drop significantly?
a. helper T cells b. B cells c. plasma cells d. mast cells e. cytotoxic T cells
The _____ of an antibody molecule functions to recognize and bind to a specific antigen
a. antigen-antibody complex b. antigen-binding site c. light chain d. heavy chain e. immunoglobulin motif