Following reports that stained chromosomes "disappeared" while observing cell division, scientists in the early 1900s determined the molecule of heredity to be
A) DNA.
B) RNA.
C) protein.
D) lipids.
E) carbohydrates.
C) protein.
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Viral infections are not considered a risk factor for autosomal trisomy because a virus cannot affect human chromosome arrangement
a. True b. False Indicate whether the statement is true or false
Myosin and actin are the major contractile proteins in _______ muscle.
A. cardia B. smooth C. skeletal D. two of the above E. all of the above
Consider each of the following crosses and determine which pair of animals belongs to the same species.
A. Horse ´ donkey—does not occur naturally; offspring sterile B. Eastern milk snake ´ coastal plain milk snake—occurs naturally; offspring fertile C. Lion ´ Tiger—does not occur naturally; offspring sterile D. None of these answers is correct.
When Pavlov's dog salivated after hearing a bell, this exemplified
A. classical conditioning. B. operant conditioning. C. habituation. D. nonassociative learning.