Which signal do helper T cells respond to in the MHC II molecule?
a. missing self
b. normal self
c. non-self
d. altered self
c. non-self
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Phage T4 gains release from the infected host cell like many other double stranded DNA phages by interfering with the activity of enzymes that synthesize peptidoglycan.
Answer the following statement true (T) or false (F)
In some arthropods tagmatization has produced a combination of head and thorax known as a
A. cephalothorax. B. fused corpora. C. headless mite. D. larval instar. E. thoracotomy.
About 10-15% of African Americans in the US are carriers for ____, an autosomal recessive genetic disorder in which
a defective version of the hemoglobin protein is produced. a. Duchenne muscular dystrophy b. phenylketonuria c. achondroplasia d. sickle-cell anemia e. cystic fibrosis
Multiple sclerosis is a result of
A) demyelination of nerve cells. B) excess myelin on nerve cells. C) a decrease in postsynaptic receptors. D) blocking the nodes of Ranvier. E) proteolytic cleavage of presynaptic SNARE proteins.