During the luteal phase of the menstrual cycle, if the oocyte is not fertilized, a number of events occur which are listed below. Select the answer that places the events in the correct chronological order
Events:
1. the lining of the uterus is shed
2. the corpus luteum secretes progesterone
3. follicle cells are converted to the corpus luteum
4. the corpus luteum degenerates
5. estrogen and progesterone levels fall
A. 3, 2, 4, 5, 1
B. 1, 2, 3, 4, 5
C. 2, 4, 3, 1, 5
D. 4, 3, 2, 1, 5
E. 5, 2, 3, 4, 1
A
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According to Fig 9.10, which of the following is NOT responsible for amplifying the signal in a cell responding to adrenaline signaling?
A. the binding of the receptor by adrenaline B. the production of cAMP by adenylyl cyclase C. the activation of protein kinase A by cAMP D. the phosphorylation of proteins by protein kinase A E. All of these choices amplify the adrenaline signal.
Which of the following is mostly performed by bacteria living within the roots of plants in the legume family?
a. nitrification b. ammonification c. nitrogen cycling d. nitrogen fixation e. nitrogen assimilation
A TATA box is seen in __________ cells and is the site where __________
a. bacterial; RNA polymerase binds b. eukaryotic; DNA ligase cleaves introns c. eukaryotic; RNA polymerase binds d. both bacterial and eukaryotic; transcription factors bind e. bacterial; a repressor protein binds
Barbara McClintock discovered mobile elements in corn by analyzing the genetic behavior of two elements, Ds and Ac. The interplay between these two elements has become one of the most interesting stories of discovery in the field of genetics
How do Ds and Ac interact? A) Both elements can move only within chromosome 9. B) Ds causes a deletion next to the insertion site of Ac. C) Ac causes a deletion next to the insertion site of Ds. D) The movement of Ac is dependent on two forms of Ds. E) Ds moves only if Ac is present in the genome; Ac is capable of autonomous movement.