The precipitin test that involves antigen and antibody diffusing toward each other, producing a visible precipitin band at the point at which they meet, is referred to as:
a. double immunodiffusion.
b. counterimmunoelectrophoresis.
c. particle agglutination.
d. enzyme immunoassay.
A
Double immunodiffusion is a test that involves an antigen and antibody diffusing toward each other to produce a precipitin band at the meeting point.
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Diploid somatic cells of elephants have 56 chromosomes. If nondisjunction of one of an elephant's chromosomes occurs in meiosis II, the resulting sperm are expected to have the chromosome complement:
A. 28, 28, 28, 28 B. 28, 28, 29, 27 C. 29, 29, 27, 27 D. 29, 29, 28, 28 E. 56, 56, 57, 55
Which process employs exposing cells cultured in the laboratory to DNA with a gene of interest?
a. transformation b. transfection c. DNA fingerprinting d. polymerase chain reaction e. gel electrophoresis
Which neurotransmitter functions to elevate mood?
a. acetylcholine b. epinephrine c. dopamine d. serotonin e. GABA
What are the main steps of biogenesis, in the correct order?
A) Polymers, monomers, self-replicating molecules, first cells B) Self-replicating molecules, monomers, polymers, first cells C) Monomers, self-replicating molecules, polymers, first cells D) Monomers, Polymers, self-replicating molecules, first cells