A cell produces proteins when ribosomes (a form of RNA and protein) and transfer RNA (tRNA) work together. Specific amino acids are brought by tRNA into the ribosome, where they are rapidly connected by covalent bonds. This indicates that ribosomes are acting as
A. enzymes.
B. substrates.
C. a source of energy.
D. active sites.
E. reactants.
A. enzymes.
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The major macromolecules of the ECM are
A. fat and proteins. B. nucleotides and proteins. C. fat and nucleotides. D. polysaccharides and proteins. E. polysaccharides and fat.
About 80% of plants have mycorrhizae linking them to
A) chytrids. B) glomeromycetes. C) ascomycetes. D) basidiomycetes.
Which of the following statements concerning allografts is TRUE?
A) They are the best type of transplants because they are not associated with rejection. B) They induce strong type IV hypersensitivity reactions and must be treated with immunosuppressive drugs. C) They always require complete destruction of the recipient's bone marrow cells. D) They are impossible to perform because the antigens between donor and recipient are so different. E) They are the rarest type of transplants.
The disappearance of diatoms from the world's oceans would result in an overall increase in the concentration of atmospheric oxygen.
Answer the following statement true (T) or false (F)