What would be the most direct effect of removing or damaging an insect's antennae? The insect would have trouble _____
A) hearing
B) mating
C) eating
D) seeing
E) smelling
Answer: E
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Which of the following is not a regulatory mechanism used to control the tryptophan operon in Escherichia coli?
A. Attenuation B. Repression C. Catabolite repression D. All of the choices are correct.
In natural samples it is often difficult to differentiate live cells from dead cells or cells from nonliving matter
Indicate whether the statement is true or false.
Which of the following shows Chargaff's equivalence?
A) mRNA B) single-stranded DNA C) tRNA D) synthetic DNA (one strand all A, the other all T) E) all of the above
The calcium-rich remains of protists are now found
a. in sea floor sediments. b. in limestone rock formations. c. in the white cliffs of Dover, England. d. in the Egyptian pyramids. e. in all of these places.