A constitutive mutation in the lac operon may be of several types. Name two types of constitutive mutations
What will be an ideal response?
lacI - and lacOc
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The cortical reaction causes
A. the zona pellucida or vitelline layer to harden. B. the embryo to embed into the uterus. C. egg membrane depolarization. D. the sperm to bind to the egg membrane. E. fast block polyspermy.
Under the right conditions, an electron can
a. move to a lower energy level. b. enter an orbital shared by two atoms. c. move to a higher energy level. d. move from one atom to another atom. e. all of these
During which stage of the cell cycle do the chromosomes duplicate?
A. telophase B. prophase C. mitosis D. anaphase E. interphase
Effects of bacterial exposure may lead to disease in the host. Place the following occurrences in the proper sequence or order.
A) disease, infection, contact B) contact, disease, infection C) contact, infection, disease D) infection, contact, disease