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Principles of Biology I




5. Which of the following is NOT correct about bacterial conjugation?;a. F cells do not contain the F factor.;b. Bacterial conjugation results in an exchange of genes between;two bacterial cells.;c. Genes on the F factor code for sex pili.;d. Genes can be transferred from the donor to the recipient.;e. Hfr cells can produce sex pili.;6. In generalized transduction, a bacterium obtains DNA from a virus as;a result of a lytic cycle. The bacterium will;a.;survive.;b. harbour a prophage.;c.;die immediately.;d. reproduce for a few generations, until the prophage becomes;virulent.;e. contain virus nucleic acid.;7. A repressible operon is usually controlled by;a. an inactive repressor that allows the operon to be in the on;state.;b. the supply of the precursor product for the enzymes.;c. an inactive repressor that keeps the operon in the off state.;d. tryptophan.;e. being turned on, usually by the end product of the pathway.;8. A karyotype reveals that an individual is XYY. Based on your;knowledge of human genetics, you conclude that this individual is;phenotypically;a.;female and has unusual physical features.;b. female and is sterile.;c.;female and is fertile.;d. male and is sterile.;e.;4;male and is fertile.;Biology 204;9. Translocation occurs when;a. part of a chromosome breaks off and attaches to a;nonhomologous chromosome.;b. part of a chromosome breaks off and attaches to a homologous;chromosome.;c. crossing-over events occur.;d. genes move from one area on a chromosome to another area on;the same chromosome.;e. a Y chromosome replaces an X chromosome in a female cell.;10. In a plant cell, cytokinesis begins with the formation of;a. an aster.;b. a mitotic spindle.;c. a Golgi complex.;d. a cell wall.;e. a cell plate.;11. In a human cell at prophase I, there are ________ tetrads.;a. 92;b. 46;c. 23;d. 2;e. 4;12. In which phase are chromosomes least condensed?;a. metaphase;b. prophase;c. anaphase;d. interphase;e. telophase;Principles of Biology I;5;13. Translation is the process whereby the ________ moves in order;to place the tRNA bound to the growing polypeptide chain in;the ________ site, thereby freeing the ________ site for a new;aminoacyl-tRNA.;a. mRNA, A, P;b. ribosome, P, A;c. tRNA, P, A;d. ribosome, A, P;e. tRNA, A, P;14. Which of the following statements about DNA is FALSE?;a. DNA is capable of forming many different sequences.;b. DNA contains thymine instead of uracil.;c. DNA is double-stranded in eukaryotic cells.;d. DNA is single-stranded in prokaryotic cells.;e. DNA contains the sugar deoxyribose.;15. Binary fission occurs when;a. mitosis takes place without cytokinesis.;b. homologous chromosomes have already paired.;c. the cyclin-Cdk complex is no longer phosphorylating enzymes.;d. the cell cycle is out of control.;e. a prokaryotic cell reproduces.;16. Sticky ends are;a. the single-stranded ends of a DNA segment created by some;restriction enzymes.;b. a problem in recombinant DNA technology because they form;loops of single-stranded DNA.;c. double-stranded ends of a DNA segment created by some;restriction enzymes.;d. sites of the origin of replication in prokaryotes.;e. sugar molecules that are bound to the ends of a DNA fragment.;6;Biology 204;17. Enzymes called ________ form breaks in DNA molecules to prevent;overtwisting in the DNA helix during replication.;a. topoisomerases;b. single-strand binding proteins;c. DNA polymerases;d. RNA polymerases;e. DNA ligases;18. What is the probability that two lizards that are heterozygous for;striped tails (Ss) will produce an offspring that is homozygous for;no stripes (ss) on its tail?;a. 1;b. 1/2;c. 1/4;d. 1/8;e. 0;19. Crossing over occurs in which phase of mitosis?;a. metaphase;b. anaphase;c. prophase;d. telophase;e. none of the above;20. Genes that encode proteins that are always needed are called;a. repressible genes.;b. promoter genes.;c. constitutive genes.;d. inducible genes.;e. operons.;21. A polyribosome is;a. a complex of many ribosomes and an mRNA.;b. a complex of many ribosomes in eukaryotes.;c. an initiation complex in eukaryotes.;d. an elongation complex in eukaryotes.;e. a complex of a ribosome with its two subunits and several;mRNAs.;Principles of Biology I;7;22. Which of the following statements concerning the cell cycle is;FALSE?;a. CDKs are involved in the regulation of the cell cycle.;b. External factors are involved in the regulation of the cell cycle.;c. CDKs are active only when they bind to cyclins.;d. The amount of CDKs changes during the cell cycle.;e. Several types of cyclin regulate different phases of the cell cycle.;23. How does the first nucleotide at the 5 end of a new mRNA chain;differ from the other nucleotides in the chain?;a. The first nucleotide is always a uracil.;b. The first nucleotide is always a cytosine.;c. The first nucleotide retains its triphosphate group, while the;others do not.;d. The first nucleotide does not retain its triphosphate group, while;the others in the chain do.;e. The first nucleotide is always a modified cytosine.;24. A chromosome has the genes U, V, W, and X. They have been shown;to have the following crossover frequencies: U and V: 2%, U and;W: 9%, U and X: 7%, V and W: 7%, V and X: 5%, and W and X: 2%.;What is the sequence of the genes on the chromosome?;a. W-X-V-U;b. U-X-V-W;c. X-W-U-V;d. V-U-W-X;e. none of the above;25. Why does DNA synthesis only proceed in the 5 to 3 direction?;a. Because DNA polymerases can only add nucleotides to the 3 end;of a polynucleotide strand.;b. Because the 3 end of the polynucleotide molecule is more;electronegative than the 5 end.;c. Because that is the direction in which the two strands of DNA;unzip.;d. Because that is the only direction that the polymerase can be;oriented.;e. Because the chromosomes are always aligned in the 5 to 3;direction in the nucleus.;8;Biology 204;26. Which of the following represents the sequence of events during;mitosis?;a. prophase metaphase anaphase telophase;b. interphase metaphase anaphase telophase;c. anaphase telophase metaphase interphase;d. interphase prophase anaphase metaphase;e. metaphase telophase anaphase prophase;27. Random segregation refers to;a. crossing over.;b. regulation of mitosis.;c. events during transduction.;d. Barr bodies.;e. paternal and maternal chromosomes.;28. Where is the amino-acid binding site located on the tRNA molecule?;a. in the middle of the loop;b. at the 3 end of the molecule;c. in the first loop;d. along the longest stretch of base pairing in the molecule;e. at the 5 end of the molecule;29. During mismatch repair of DNA, the repair enzyme;a. will remove several nucleotides on both DNA strands.;b. will remove several nucleotides on one DNA strand.;c. will remove only the mismatched nucleotide.;d. will remove the mismatched nucleotide, and the same enzyme will;replace it with the correct nucleotide.;e. is unable to detect mutations.;30. Which of the following is TRUE regarding alternative splicing?;a.;It is very uncommon in humans.;b. One strand of DNA can produce different mRNAs.;c. Introns are often absent.;d. As a result, the same proteins are produced in different cell types.;e. All exons are used to produce m-RNA.;End of Assignment 2B;Principles of Biology I


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