What prevents menstruation from occurring in the 10th week when the corpus luteum regresses?
A. The follicle takes over secretion of hCG.
B. The follicle takes over secretion of estradiol and progesterone.
C. The placenta takes over secretion of estradiol and progesterone.
D. The cervix takes over secretion of oxytocin and prostaglandins.
C. The placenta takes over secretion of estradiol and progesterone.
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Imagine that you are investigating the production of insulin in normal cells to help determine the cause of faulty insulin production in cells where insulin appears to be synthesized but fails to be secreted from the cell
You design experiments using three different pharmaceutical compounds to help pinpoint the trouble spot in the protein synthetic pathway. The first compound blocks transport vesicle movement in the cytoplasm. The second blocks the SRP release from the ribosome and mRNA. The third compound binds to and blocks the signal sequence so the SRP cannot recognize it. For each of these three treatments, indicate 1) whether the protein would be made at all, and if so, 2) where in the cell you would find it. What will be an ideal response?
Which of the following processes would be most likely to occur in the Golgi complex?
A) synthesis of steroids B) production and packaging of lipids C) glycosylation of proteins D) synthesis of DNA E) detoxification of drugs
Photosynthetic autotrophs use ________ from the air as a carbon source and ________ as their energy source
Fill in the blank(s) with correct word
Lakes become eutrophic by
A. accumulation of organic matter. B. loss of organic matter. C. circulation of water in the lake. D. free exchange of water with outside sources. E. an increase in the number of organisms.