Women with polycystic ovarian syndrome have difficulty conceiving because ____
a. they don't produce enough oocytes
b. the oocytes they produced cannot mature
c. they ovulate infrequently
d. the uterus is filled with mucus that impedes implantation
e. the oviducts are scarred
ANSWER: c
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Which of the following is NOT true of small effector molecules?
A. They can cause a conformational change in a regulatory protein. B. They can prevent a repressor from binding a gene region. C. They can regulate gene transcription by binding to DNA. D. They can regulate gene transcription by binding a regulatory protein.
A small molecule of RNA is transcribed in the nucleus. It is folded, cleaved by dicer protein, and then binds to a target
molecule of mRNA. This molecule of RNA must be ____.
a. miRNA b. siRNA c. an mRNA that was not properly capped d. an mRNA that never received its poly-A tail e. a transcript for a repressor protein
The phenotype of a person with alpha thalassemia depends on the
A) number of beta globin genes. B) presence or absence of a sickle cell mutation. C) number of alpha globin chains. D) rate of replication of the alpha globin genes.
In lakes and ponds, the open-water zone extending to the depth of light penetration is referred to as the ________ zone
Fill in the blank(s) with correct word