How does the adaptive immune system differ from the innate immune system?
A. in the ability to distinguish self from nonself
B. in having memory
C. in the ability to target a specific pathogen
D. both in having memory and in the ability to
target a specific pathogen
D
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Kinesin motor proteins use ATP energy to:
A. carry vesicles along a microtubule within a cell in a minus-to-plus direction. B. carry vesicles along a microfilament within a cell in a minus-to-plus direction. C. carry vesicles along a microtubule within a cell in a plus-to-minus direction. D. carry vesicles along a microfilament within a cell in a plus-to-minus direction. E. slide along microfilaments to contract muscle cells.
If a cell is dividing by binary fission then you know that:a
mitosis has taken place without cytokinesis. b. homologous chromosomes have already paired. c. the cyclin-Cdk complex is no longer phosphorylating enzymes. d. the cell cycle is out of control. e. the cell is prokaryotic
Genes that have homologs in a variety of species have been discovered through the analysis of genome sequences
In fact, it is not uncommon to find a family of homologous genes encoding proteins that are unmistakably similar in amino acid sequence in organisms as diverse as budding yeast, archaea, plants, and humans. Even more remarkably, many of these proteins can substitute functionally for their homologs in other organisms. Explain what it is about the origins of cells that makes it possible for proteins expressed by homologous genes to be functionally interchangeable in different organisms.
It is thought that all eukaryotes have about 300 genes in common. Would you predict that these genes would be used at different times during the life cycle of multicellular animals? Explain your answer
What will be an ideal response?