Exam%203%20Bios%20100%20%20Spring%202010%20revised

Exam%203%20Bios%20100%20%20Spring%202010%20revised - Bios...

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Bios 100 Spring 2010 Exam 3 1. Which nucleic acid is translated to make a protein? A. mRNA B. rRNA C. DNA D. tRNA E. none of the above 2. What is meant by translocation? A. The polypeptide chain grows by one amino acid B. The completed polypeptide is released from the ribosome. C. The two ribosomal subunits are joined in a complex. D. The ribosome slides one codon down the mRNA. E. The ribosome translocates into two distinct pieces. 3. Which of the following statements best defines the term operon? A. An operon is a region of DNA that codes for sugar-metabolizing enzymes. B. An operon is a region of DNA that consists of a single gene regulated by more than one promoter. C. An operon is a region of DNA that codes for a series of functionally related genes under the control of the same promoter. D. An operon is a region of RNA that consists of the coding regions of more than one gene. E. An operon is a region of DNA that has multiple introns and exons. 4. What happens to the expression of the lacI gene if lactose is not available in the cell? A. The lacI gene increases its rate of transcription B. The lacI gene turns on. C. There is no change—the lacI gene is constitutively expressed. D. The lacI gene turns off. E. The lacI intron is removed from the mRNA. 5. Which of the following terms describes the DNA–protein complexes that look like beads on a string? A. Chromatin B. 30-nanometer fiber C. Histones D. Nucleosome E. Operon
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6. Which regulatory DNA sequences might be located thousands of nucleotides away from the transcription start site of a gene? A. Promoter B. Promoter-proximal element C. TATA box D. Enhancer E. None of the above 7. Which molecules never cross the nuclear membrane? A. DNA B. mRNA C. Nucleotide tri-phosphatates D. Proteins E. They all cross the nuclear membrane 8. In experiments to test whether a protein can enter the nucleus, why would proteins be labeled with fluorescent molecules? A. To target the proteins to the nucleus B. To make the proteins easy to see C. To make the proteins bigger D. To give the protein molecules energy E. To insure that they will be able to cross the nuclear pore. 9. Which term describes two recently replicated DNA strands that are joined together just before cell division? A. Centriole B. Centrosome C. Centromere D. Sister chromatids E. Synapsids 10. The copying of chromosomes occurs during which of the following phases of the cell cycle? A. G2 phase B. G1 phase C. M phase D. S phase 11. What is the ploidy of organisms that have two sets of chromosomes? A. n B. 4n C. 2n D. 3n E. 0
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12. If a cell has 24 chromosomes, how many chromosomes would each of its four daughter cells have after meiosis? A. 6 B. 12 C. 24 D. 48 E. None of the above 13. Gene expression can be controlled at which of the following levels?
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Exam%203%20Bios%20100%20%20Spring%202010%20revised - Bios...

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