What is tolerance, and why must the adaptive immune system exhibit tolerance?
What will be an ideal response?
Answer: Tolerance is the acquired inability to make an immune response to self-antigens. Tolerance ensures that adaptive immunity is directed to outside agents that pose genuine threats to the host and not to host proteins.
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The three types of neurons in the nervous system of humans are
A. interneurons, synaptic neurons, and neuroglia. B. synaptic neurons, motor neurons, and Schwann cells. C. sensory neurons, interneurons, and motor neurons. D. Schwann cells, sensory neurons, and neuroglia. E. synaptic neurons, motor neurons, and sensory neurons.
A scientist studied DNA replication in a test tube. He added single-stranded DNA template strands, DNA polymerase, and radioactively-labeled nucleotides. After replication occurred, he tested the DNA to find out which strands now contained radioactive nucleotides. What is the best prediction of his results?
A) Only the template strands will contain radioactive nucleotides. B) Only the newly-synthesized strands will contain radioactive nucleotides. C) Both the template strands and the newly-synthesized strands will contain radioactive nucleotides. D) Neither the template strands nor the newly-synthesized strands will contain radioactive nucleotides
The primitive Earth's atmosphere contained gases produced by
A. outgassing by the Earth's interior. B. gravitational energy. C. radioactivity. D. All of the choices are true.
The ability to utilize different metabolites for cellular respiration is one method for identifying bacteria
Indicate whether the statement is true or false