The molecular interaction between an antigen presenting cell and a T cell is
A. an immunological synapse.
B. clonal expansion.
C. CD95L.
D. regulatory TCR.
E. a dendrite.
Answer: A
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What fraction of the time will the cross of Aa Bb with Aa Bb produce an offspring that will express the dominant trait
for one of the two alleles? a. 16/16 b. 9/16 c. 6/16 d. 3/16 e. 1/16
Which piece of evidence BEST supports the "out of Africa" model of the evolution of modern humans?
A) African populations show the greatest diversity in numbers at a short tandem repeat (STR) locus on chromosome 12. B) African Homo ergaster/erectus appear almost simultaneously with Asian Homo erectus, 1.6 to 1.9 million years ago. C) Both Indonesian fossil Homo erectus and modern Australian aboriginal populations (which probably reached Australia by way of Indonesia) have unusually prominent and straight brow ridges. D) In most regions, there does not seem to be a rapid replacement of earlier hominins by Homo sapiens. E) There is no solid evidence supporting the "out of Africa" hypothesis.
Risks for Q fever include contact with infected cattle and drinking unpasteurized milk
Indicate whether the statement is true or false
Which of the following is found in both archaeal and eukaryotic genomes?
A. chromatin fibers B. histones C. heterochromatin D. euchromatin E. nuclear envelope