What is the name of the birth defect in which the neural tube fails to close completely?
a. neurulation
b. fossa ovalis
c. organogenesis
d. spina bifida
e. capacitation
ANSWER: d
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If carbon has an atomic mass of 12 and an atomic number of 6 then it has
A. 6 electrons. B. 12 electrons. C. 18 electrons. D. as many as 6 but no more than 12. E. None of the choices are correct.
The trp operon in E. coli is regulated in such a manner as to allow expression of the genes only when cellular levels of tryptophan are low. When tryptophan levels are adequate, the secondary structure of the mRNA halts translation. This form of regulation is known as
A) attenuation. B) transcriptional regulation. C) positive regulatory control. D) negative regulatory control. E) repression.
This animal has hemolymph that empties into
an internal cavity. Which animal is it?
a. a bee b. a clam c. a monkey d. an earthworm e. more than one of these animals
Which of the following statements best explains why there are fewer colonies on plate IV than on plate III?
(A) Plate IV is the positive control. (B) Not all E. coli cells are successfully transformed. (C) The bacteria on plate III did not mutate. (D) The plasmid inhibits E. coli growth.