Which of the following are pyrimidine nitrogenous bases?
A) guanine and adenine
B) cytosine and uracil
C) thymine and guanine
D) ribose and deoxyribose
E) adenine and thymine
Answer: B
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Nucleic acids to be analyzed using microarrays are usually tagged by covalent attachment of ________ molecules.
Fill in the blank(s) with the appropriate word(s).
Which is the correct order of cytoskeletal filaments in decreasing filament diameter?
A. microfilaments > microtubules > intermediate filaments B. microtubules > intermediate filaments > microfilaments C. microtubules > microfilaments > intermediate filaments D. intermediate filaments > microfilaments > microtubules
Cluster-of-differentiation antigens are found on
A) B cells, where they determine the antibody types that are made. B) B cells, where they make recognition of self antigens on macrophages possible. C) T cells, enabling them to recognize foreign antigens on macrophages. D) macrophages, enabling them to link with both B and T cells.
Which of the following can be used by humans as an energy source?
a. chitin b. amino acids c. cellulose d. RNA