The exchange of chromosome regions between homologous chromosomes during meiosis is known as ____
a. irradiation damage
b. crossing over
c. chromosomal aberration
d. fertilization
e. spindle fiber formation
ANSWER: b
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Which of the following is not true of the regulation of the arabinose operon?
A. CRP activates expression when bound to cAMP. B. AraC protein recruits RNA polymerase when bound to arabinose. C. Arabinose binds to AraC protein, decreasing its affinity for a DNA site near the promoter. D. Arabinose binding alters the conformation of the dimerization domain of the AraC protein.
Which is not true of the cytoplasmic membrane?
A. It defines the boundaries of the cell. B. It is a semipermeable barrier. C. It consists mainly of a fixed, static, phospholipid bilayer. D. It uses proteins as selective gates and sensors. E. All of the choices are true.
At what stage does a human embryo implant in the uterus?
A) Embryonic disk B) Morula C) Gastrula D) Fetal E) Blastocyst
Fungi obtain nutrients by ________ digestion.
Fill in the blank(s) with the appropriate word(s).