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BIO321_Exam_2_answer - BIO321 Cell Biology Exan 2 Fall 2005 True/False 1 Much of the difference between animals is due to differential regulation

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Unformatted text preview: BIO321 Cell Biology Exan 2 Fall 2005 True/False 1. Much of the difference between animals is due to differential regulation of the same basic sets of genes during embryonic development. A. True B. False True A 2. Embryonic stem cells (ES cells) have the capacity to become any cell type of the body. They are therefore referred to as totipotent. A. True B. False True A 3. The cell identity genes in adult jawed vertebrates are referred to as the Major Histocompatibility Complexes. A. True B. False True A 4. Inositol triphosphate is a molecule involved in the mediation of extracellular signals to internal target proteins. A. True B. False True A 5. DuRIng ¡EvELOP¢EnT, £ELLS BE£O¢E "¡ETER¢InE¡" FOR specifc Fates. A cell is said to be determined when it will develop into a different cell type when transplanted to a different part of the embryo. A. True B. False False B 6. The initial dorso-ventral patterning of the early ¤¥¦§¦¨©ª«A ¬­B¥Y¦ ¦££U¥§ B¬®¦¥¬ ®¬¥¯ª«ªzA¯ª¦N. A. True B. False True A 7. The mesoderm of the early embryo is the tissue from which cells of the adult gut are derived. A. True B. False False B 8. In order for the animal to recognise the cell identities of “self” cells, T-cells are educated during their passage through the thymus. A. True B. False True A 9. In order for the animal to recognise the cell identities of “§°±²” ³°±±§´ µ-³°±±§ ¶¥° §°±°³¯°· ¸Y Un·°¥GO¹nG ³Y³±°§ O² º°G¶T¹v° ¶º· »¼S¹T¹v° ¸¹º·¹ºG T¼ S°±² ½¾¿ À¼±°³u±°S before entering the general circulation as mature T-cells. A. True B. False True A 10. T-helper cells are sometimes referred to as CD4 positive cells and cytotoxic T-cells are sometimes REFERRED tO As C¡8 POsitivE ¢ELLs. A. True B. False True A 11. Growth factors only cause cells to grow in size. A. True B. False False B Multiple Choice 12. Extracellular signalling molecules are recognized by proteins on the cell surface called A. sodium-potassium ATP-ase B. stress fbers C. cyclins D. receptors E. ion-gated channels receptors D 13. The transfer of a phosphate group to a molecule or compound is called A. hydrogenation. B. hydrogen bonding. C. phosphorylation. D. ionization. E. carboxylation. phosphorylation. C 14. Cy¡LI¡ AMP IS ¡O¢¢ONLy REfERRED £O ¤S A. energy currency B. a second messenger C. adenyl cyclase D. an enzyme E. a primary messenger a second messenger B 15. Enzyme linked receptors have cytoplasmic domains that are usually A. G-proteins B. kinases C. bound to the cytoskeleton D. peptidases E. none of the above kinases B 1 16. Increased cAMP levels in cells:- A. is due to activation of adenylate cyclase B. leads to the activation of A-kinase C. can be due to the binding of an activated G-protein to adenylate cyclase D. both a and b E. a, b and c are all correct a, b and c are all correct E 17. During embryonic development, cells may become different by which of the following A. asymmetric cell divisionA....
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This note was uploaded on 02/05/2012 for the course BIOLOGY BIO 320/32 taught by Professor Dr.c during the Spring '11 term at Murray State KY.

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BIO321_Exam_2_answer - BIO321 Cell Biology Exan 2 Fall 2005 True/False 1 Much of the difference between animals is due to differential regulation

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