Unit I Exam-B Spr11 Reg KEY

Unit I Exam-B Spr11 Reg KEY - BSC 2011-02 UNIT I EXAM -...

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BSC 2011-02 UNIT I EXAM - FORM B SPRING 2011 Name, please: _______ ANSWERS AT THE END _________________ DIRECTIONS: Please bubble in the letter of the single best choice for each question on your scantron. Then please write your name on the last page of this exam, tear off that page, and write your essay. 1. What role does a morphogen play in embryonic development? A) different genes get regulated depending on a morphogen’s concentration in embryonic cells B) a morphogen coordinates the correct placement of embryonic features C) a morphogen induces embryonic cells to differentiate D) only A and B apply E) A, B and C apply 2. The “genetic information” contained within a gene resides in its ______. A. sequence of amino acids B. sugar-phosphate chain C. sequence of ribonucleotide bases D. double helix E. sequence of deoxyribonucleotide bases 3. What effect does the amount of yolk in a mesolecithal egg have on subsequent development? A) the resulting blastula has a reduced blastocoel offset toward the vegetal pole B) invagination forms a primitive streak rather than a blastopore C) it prevents the formation of a blastocoel but not an archenteron D) the yolk slows cell division and becomes unevenly distributed among the cells of the resulting blastula E) it restricts invagination to the blastoderm region of an embryo 4. A researcher synthesizes a miRNA with a specific nucleotide sequence based on her knowledge of a particular protein- coding gene. She then inserts the miRNA into a cell. She does this in order to _____. A) increase transcription of that gene B) block translation of that gene’s transcript C) identify the gene’s location on a particular chromosome D) block transcritpion of that gene E) none of the above 5. Metabolic wastes are collected in a sac formed by which extra-embryonic membrane? A) chorion B) vitelline C) yolk-sac D) amnion E) allantois Please match the three types of germ tissue listed below (A, B and C) with the organ(s) each type of germ tissue can form. Choices may be used more than once or not at all. A. endoderm B. ectoderm C. mesoderm 6. lungs 7. ribs 8. skin 9. liver 10. brain 11. In vertebrates with forelimbs (arms, wings, etc.), cells of the apical epidermal ridge organizer are responsible for _____. A) directing the proper anterior-posterior arrangement of limb bones B) directing the proper location of neural tube formation C) directing the proper location of invagination during early gastrulation D) directing the proper proximal-distal arrangement of limb bones E) directing the proper anterior-posterior body axis of the embryo 12. Digits remain joined in the webbed feet of ducks because ___. A) caderin expression is blocked B) apoptosis is blocked C) bicoid gene expression is blocked D) choices A and B apply E) choices A, B and C apply 13. A biologist observes that the small Florida Keys deer can mate with northern white-tail deer but do not produce any offspring. This most likely explanation is that _____. A) the gametes of both types of deer have incompatible cytoskeletal microtubules
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This document was uploaded on 11/03/2011 for the course BIO bsc2011 at FSU.

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Unit I Exam-B Spr11 Reg KEY - BSC 2011-02 UNIT I EXAM -...

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