Elements differ from each other in their
a. physical properties only.
b. atomic number only.
c. type of subatomic particles.
d. physical properties and atomic number.
e. type of electrons.
Answer: d. physical properties and atomic number.
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The promotion of the lactose operon in
bacteria is a. activated by a repressor protein. b. independent of glucose concentration. c. activated by t lactose binding. d. regulated by RNA polymerase. e. none of these
The seed coat forms from the
a. zygote. b. cotyledon. c. nucleus. d. integuments. e. embryo sac.
Suppose that crossing-over during meiosis occurs within a region where one of the homologous chromosomes has an inversion with respect to the other homolog. Which chromosomal alterations would you expect to find in the gametes produced by this organism?
a. balanced translocations b. translocations c. both duplications and deletions
A urine sample collected directly from the urinary bladder
A) is sterile. B) contains fewer than 100 pathogens/ml. C) contains fewer than 10,000 pathogens/ml. D) contains more than 100,000 pathogens/ml. E) has leukocyte esterase.