Passive immunity can be obtained by:
a. having the disease
b. receiving a vaccination against the disease
c. receiving antibodies by injection
d. receiving memory B cells from a donor
e. receiving a booster vaccination
c
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The oldest fossils of eukaryotes have been estimated to be
A. 6000 years old. B. 8 billion years old. C. 4.5 billion years old. D. 1.5 billion years old. E. 1995 years old.
In a two-point test-cross analysis, a dihybrid F1 fly is crossed to a __________
A) pure-breeding mate with a dominant phenotype (AABB) B) pure-breeding mate with a recessive phenotype (aabb) C) heterozygote mate (AaBb) D) mate that is dominant for one gene and recessive for the other (AAbb or aaBB) E) second dihybrid F1 fly (sibling cross)
Antibodies are ________
A) composed of four fatty acid chains B) a type of lymphocyte C) proteins with short carbohydrates attached D) proteins consisting of four polypeptide chains
In eukaryotes, pre-mRNA processing may involve all of the following except
A. addition of a 3' poly-A tail B. removal of exons from the pre-mRNA. C. addition of a 5' cap. D. pre-mRNA splicing by the spliceosome.