The role of the CDR in a TCR is to
a. anchor the TCR in the cytoplasmic membrane.
b. link the alpha and beta chains.
c. bind the MHC–peptide complex.
d. do all of the above.
Answer: C
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In 1927, the U.S. Supreme Court upheld the right of states to use ____________________ as a means of preventing
reproduction by those deemed “unfit.” Fill in the blank(s) with the appropriate word(s).
Which of the following events will occur in response to gravitropism?
A. The guard cells will swell with water due to an increase in sodium ions which will cause the plant to grow upright. B. Because of the change in the plant's position, it will have sediments of statoliths (amyloplasts containing starch granules) settle towards the lower side of the stems and roots and come into contact with the cytoskeletal elements. C. The stems on the shady side of the plant will elongate due to the presence of auxin. D. The tendril of the plant will coil around any type of substrate that it comes into contact with.
The organisms originally responsible for putting oxygen in Earth's atmosphere lived around
A) 3.5 million years ago. B) 3.5 billion years ago. C) 6 billion years ago. D) 1.5 million years ago. E) 2.4 billion years ago.
Fred has been diagnosed with a disease that causes him to forget that his relatives have been to see him. What parts of his brain are likely affected, given this information?
A) cerebellum and midbrain B) corpus callosum and pons C) hippocampus and amygdala D) medulla oblongata and thalamus