2011 Practice Exam Ic

2011 Practice Exam Ic - UNIT I EXAM - FORM A BSC 2011 -...

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UNIT I EXAM - FORM A BSC 2011 - SECTION 03 FALL 2007 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 2) Thymine makes up 12% of the nucleotides in a sample of DNA from an organism. Approximately, what percentage of the nucleotides in this sample will be cytosine? A) 38 B) 12 C) 24 D) 31 E) It cannot be determined from the information provided. 2) 3) The cortical reaction functions directly in the ________. A) formation of a fertilization envelope. B) release of hydrolytic enzymes from the sperm cell. C) bindin recognition between egg and sperm. D) depolariztion of the egg cell membrane. E) production of a fast block to polyspermy. 3) 4) Suppose one were provided with an actively dividing culture of E. coli bacteria to which radioactive thymine had been added. What would happen if a cell replicated once in the presence of this radioactive base? A) Neither of the two daughter cells would be radioactive. B) Radioactive thymine would pair with nonradioactive guanine. C) One of the daughter cells, but not the other, would have radioactive DNA. D) DNA in both daughter cells would be radioactive. E) All four bases of the DNA would be radioactive. 4) 5) Which of the following is true for both prokaryotic and eukaryotic gene expression? A) RNA polymerase binds to the promoter region to begin transcription. B) The processedmRNA transcript is the exact complement of the gene from which it was copied. C) Translation of mRNA can begin before transcription is complete. D) After transcription, a 3' poly-A tail and a 5' cap are added to mRNA. E) mRNA is exported from the nucleus to be translated. 5) 6) A frameshift mutation could result from _____. A) deletion of three consecutive DNA bases. B) a DNA-base insertion only. C) either an insertion or a deletion of a DNA base. D) a DNA-base deletion only. E) a DNA-base substitution only. 6) 1
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7) Which of the following is not true of cell communication systems? A) Morphogens communicate information to cells in the form of a concentration gradient. B) A single signal molecule can initiate a cascade of responses involving several genes. C) One type of hormone signal can elicit responses from several different tissue types. D) Protein phosphorylation is a mechanism of signal reception, the first stage in the cell-signaling pathway. E) A cell may differentiate in response to a signal. 7) 10) Which of the following statements concerning a eukaryotic chromosome is false ? A) It consists of a single linear molecule of double-stranded DNA. B) It has nucleosomes that both package DNA and help regulate gene expression. C) It is composed of DNA and protein. D) The number of genes on each chromosome is different in different cell types. E) Active transcription occurs on euchromatin. 10) 11) "Genomic equivalence" refers to the _____.
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2011 Practice Exam Ic - UNIT I EXAM - FORM A BSC 2011 -...

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