A pregnant woman (first trimester) is concerned that she has been exposed to a chemical that blocks estrogen and progesterone receptors so that the body does not recognize these hormones
What is the most important reason she should be worried about this? A) GnRH may be inhibited.
B) Luteinizing hormone (LH) may cause the release of another egg.
C) Ovulation might occur.
D) Menstruation may occur, thus causing the embryo or early fetus to be lost.
D
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In the lac operon, the protein that binds to the operator to prevent transcription is
the repressor. RNA polymerase. DNA polymerase. the promoter. lactose.
In DNA
a. G pairs with T and A pairs with C. b. G pairs with A and C pairs with T. c. G pairs with C and A pairs with T. d. G pairs with C and U pairs with A.
You just finished watching a scary movie and decide to take the trash out before going to bed. Halfway down the driveway, the streetlight goes out and something rattles the trashcans, just like in the movie before the monster attacked
Suddenly, the neighbor's cat jumps up onto the top of the trashcan and you shriek. Your increased heart rate is in response to the neurotransmitter A) acetylcholine. B) glutamate. C) GABA. D) norepinephrine. E) oxytocin.
Which of the following is NOT a phenotypic change typical of transforming cells compared to normal?
a) Change from a differentiated shape to a more stem-like generic shape b) Reduced dependence on external growth signals c) Increased cell-to-cell contact inhibition d) Increased mitotic activity