A chemical produced by one animal that is usually only detectable by another animal of the same species is called a
A) releaser.
B) subliminal suggestion.
C) pheromone.
D) hormone.
E) neurotransmitter.
C
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The time it takes for half of a radioisotope's atoms to decay ____
a. cannot be calculated b. is used to construct the geologic time scale c. is its half-life d. is the same for uranium 238 and carbon 14 e. is highly variable
Which of the following is a sex-linked disorder?
A) Lesch—Nyhan syndrome B) Alkaptonuria C) Albinism D) Down syndrome E) Tay—Sachs disease
The most common way to follow bacterial transformation with a plasmid is by
A. manufacturing the bacterial protein. B. conferring antibiotic resistance. C. altering the physical appearance of the cells. D. making the cells immortal. E. separating the altered cell surface.
Crick and his colleagues proposed that the genetic code consists of a series of blocks of information, called ________, each corresponding to one amino acid in an encoded protein.
A. polypeptides B. alleles C. genes D. codons