What is the function of the poly A tail?
A. The poly A tail is required for the termination of translation, it is recognized by the release factor proteins
B. The poly A tail is required for the mRNA to resume its double helical structure
C. The poly A tail increases mRNA stability in eukaryotes.
D. The poly A tail increases mRNA stability in prokaryotes.
E. The poly A tail serves as a termination sequence for RNA polymerase III.
C. The poly A tail increases mRNA stability in eukaryotes.
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In rapidly dividing cells, expression of BRCA1 and BRCA2 genes is the highest during the ____
a. mitosis to cytokinesis transition b. G1/S transition and into S phase c. G2/mitosis transition d. S/G2 transition e. metaphase to anaphase transition
The bicoid gene product is normally localized to the anterior end of the embryo. If large amounts of the product were injected into the posterior end as well, which of the following would occur?
A) The embryo would grow extra wings and legs. B) The embryo would probably show no anterior development and die. C) Anterior structures would form in both ends of the embryo. D) The embryo would develop normally.
The simplicity and clarity of Caenorhabditis elegans allowed researchers to
a. trace the developmental lineages of all cells in the adult. b. identify the genes involved in differentiation of each cell type. c. observe the process of fertilization better than had been possible in the past d. follow the process of cell aggregation to form of a multicellular organism.
Which tissue is in direct contact with the external environment of an animal?
A) Epithelial B) Connective C) Nerve D) Endothelial E) Muscle