2011 Unit I Exam-B Spr12 KEY

2011 Unit I Exam-B Spr12 KEY - BSC 2011 UNIT I EXAM - FORM...

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BSC 2011 UNIT I EXAM - FORM B Spring 2012 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 allows a protein like bicoid to regulate one set of genes in one cell and a different set of genes in another cell? A. the different genes that are in different cells B. a different concentration of bicoid C. a different amount of miRNA 2. What is an important purpose of gastrulation? A. formation of an archenteron B. formation of three germ layers C. formation of the blastocoel 3. Which is not associated with fertilization? A. a cortical rotation B. egg activation C. the fusion of nuclei D. gamete recognition E. ingression 4. Which organizer region of cells is responsible for the correct placement of our fingers relative to each other? A. the grey crescent B. the dorsal lip C. the apical epidermal ridge D. the primitive streak E. the zone of polarizing activity 5. If a somatic cell of an animal has 36 chromosomes, then a gamete from that same species should have how many? A.72 B.36 C.18 D.9 (no choice “E”) 6. What permits a sperm to penetrate an egg’s outer jelly coat? A. protein receptors on the sperm cell membrane B. bindin proteins produced by the egg C. enzymes contained in the acrosome D. enzymes released from the cortical granules E. bindin proteins on the acrosomal process 7. A particular hormone elicits a response in muscle but not liver cells. The most likely reason for this is ____. A. liver cells lack a receptor for that hormone B. liver cells lack G-proteins on their cell membranes C. liver cells cannot synthesize that type of hormone D. liver cells lack the target gene for that hormone signal E. all of the above 8. What does not occur during cleavage? A. cells grow B. cells differentiate C. DNA replicates 9. Which set of terms is accurate? A. chick – macrolecithal – holoblastic B. frog – hololecithal – mesoblastic C. frog – mesolecithal – holoblastic D. urchin – hololecithal – microblastic E. chick – macrolecithal – mesoblastic 10. How does a cell from a late-stage gastrula compare to a blastomere? A. it has different genes B. it expresses different genes C. it has more chromosomes 11. What occurs as a result of the wave of calcium ions during the fertilization process? A. release of cortical enzymes B. the acrosomal reaction C. the cortical rotation D. release of acrosomal enzymes E. bindin-receptor recognition 12. What mechanism prevents the condition of syndactyly? A. apoptosis
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2011 Unit I Exam-B Spr12 KEY - BSC 2011 UNIT I EXAM - FORM...

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