The primary function of erythrocytes is to participate in immune reactions
Indicate whether the statement is true or false.
ANS: F, leukocytes
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In many cells, the adhesion to the extracellular matrix through integrins causes the activation of kinases in the cytoplasm. This suggests that:
A. integrins promote the activation of signaltransduction pathways. B. integrins are kinases. C. extracellular matrix proteins are receptors and integrins are ligands.
Sponges belong to the phylum:
a. Porifera. b. Cnidaria. c. Platyhelminthes. d. Nematoda. e. Tubularia.
It is known that many trees lose their leaves in response to decreasing day length. As a result, you think that Ginkgo trees may also lose their leaves in response to decreasing day length. This statement is an example of:
A. an experiment B. a hypothesis C. a theory D. deductive reasoning
How does the tRNA synthetase enzyme charge a tRNA with the correct amino acid?
A. Different tRNA synthetases recognize specific sequences in the final three nucleotides on the 3' end of the tRNA and attach the matching amino acid. B. Each different tRNA synthetase has one region that recognizes the tRNA anticodon and a second region that attaches the matching amino acid to the CCA at the 3' end of the tRNA. C. A single tRNA synthetase in the cell is responsible for recognizing specific anticodon sequences and adding the correct amino acid to each tRNA. D. Different tRNA synthetases recognize specific sequences in the D and T loops of the tRNA and attach the matching amino acid.