All of following statements are TRUE regarding estrogen and progesterone, EXCEPT which one?
A) They are produced and secreted by the ovaries in response to hormones from the anterior pituitary gland.
B) They are released during a female's reproductive years.
C) They are peptide hormones that activate target cells through the cyclic AMP second messenger mechanism.
D) They regulate the menstrual cycle.
E) They stimulate development of female secondary sex characteristics.
C
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Auxin has an effect on plant embryos much like the Bicoid protein in Drosophila. If auxin were added to a culture of embryonic root cells, what would be the likely result?
A) Root cells would elongate and mature. B) Root cells would change into meristem cells. C) Root cells would halt their development. D) Root cells would not respond to auxin.
Which of the following statements about T-cells is NOT correct?
A) Lymphoid precursor cells migrate into thymus and mature into T-cells. B) TH Cells produce granzyme and perforin to lyse the target cells in the adaptive immune responses. C) More than 99% of T cells die in thymus during colony selection. D) T cells undergo both positive and negative selections during maturation. E) T cell receptors contain both variable domain and constant domain.
What evidence suggests that RNAi plays a role in heterochromatization?
a) Addition of RNAi components impair both methylation of histone H3K9 and heterochromatization. b) None of the choices is correct. c) Deletion of RNAi components impair both methylation of histone H3K9 and heterochromatization. d) Mutation of RNAi components denatures both methylation of histone H3K9 and heterochromatization. e) Deletion of RNAi components enhances both methylation of histone H3K9 and heterochromatization.
The West Nile virus is classified as a(n)
A. rhinovirus. B. coronavirus. C. togavirus. D. flavivirus. E. enterovirus.