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2011 Practice Exam Ib

2011 Practice Exam Ib - Unit I Practice Exam 1b BSC 2011...

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Unit I Practice Exam 1b BSC 2011 Select the best answer to each question and carefully fill in your response. Please avoid making any stray marks on the answer sheet. ONLY ANSWERS RECORDED ON THE COMPUTERIZED SCORE SHEET WILL BE GRADED. 1. Muscle cells in the species Homo sapiens differ from nerve cells of the same species mainly because _____. A. they express different genes B. they contain different genes C. they use different genetic codes D. they have unique ribosomes E. they have different chromosomes 2. The product of the bicoid gene in Drosophila provides essential information about _________. A. segmentation B. the anterior-posterior axis C. the dorsal-ventral axis D. the left-right axis E. lethal genes 3. The term applied to a morphogenetic process whereby cells crawl and extend themselves, making the mass of cells narrower and longer, is ______________, A. bi-axial elongation B. elongational streaming C. induction D. convergent extension E. blastomere formation 4. Vertebrae are formed from ____________. A. the notocord B. mesodermal neural folds C. ectodermal neural folds D. ectodermal somites E. mesodermal somites 5. Totipotency is demonstrated when _______. A. mutations in homeotic genes result in the development of misplaced appendages B. a cell isolated from a plant leaf grows and develops into a normal adult plant C. an embryonic cell divides and differentiates D. replacing the nucleus of an unfertilized egg with that of an intestinal cell converts the egg to an intestinal cell E. segment-specific organs develop along the anterior-posterior axis of a Drosophila embryo 6. Differences in the developmental fate of different cells in the very early frog embryo (zygote to blastula) can be due to _________. A. whether meroblastic or holoblastic cleavage occurs B. the heterogeneous distribution of cytoplasmic determinants such as proteins and mRNA C. whether the egg is microlecithal or mesolecithal D. the position of blastula cells relative to the apical epidermal ridge (AER) E. the position of blastula cells relative to the zone of polarizing activity (ZPA)
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7. Which of the following statements is NOT true concerning cadherins? A. Caderins are a subclass of cell adhesion molecules (CAMs) B. Cadherins display homophilic binding C. Binding between two cadherins is dependent on calcium D. A cell expressing E-cadherin will bind strongly to a cell expressing N-cadherin E. Cells of the neural crest stop expressing any form of cadherin to help them move away from the neural tube and the surface ectoderm. 8. When Spemann and Mangold transplanted the dorsal lip of the blastopore from an early amphibian gastrula
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2011 Practice Exam Ib - Unit I Practice Exam 1b BSC 2011...

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