Biology 151 Exam 2 Quiz Questions And Answers

Alternate splicing does which of the following? - ANS Allows partly different proteins to be translated from a single transcript Why does DNA replication require the enzyme primate? - ANS Primase builds an RNA primer so that DNA polymerase has a free 3' end attach to nucleotides to. Which of the enzyme listed below cannot catalyze the formation or breakdown of phosphodiester linkages? - ANS Helicase Scientists have discovered how to put together a bacteriophage so that it has the coat proteins of a T2 phage and the DNA of a T4 phage. If this artificially produced phage infects a bacterium, it will take over the bacterium's cell machinery and make more phages. If this occurs, the new phages produced in the host bacterial cell would have what? - ANS the protein and DNA of T4 When lactose (or technically allolactose binds the Lac operon repressor protein, the repressor does what? - ANS stops repressing transcription from the Lac operon For which processes are the following used? Terminator DNA ligase Start Codon - ANS Transcription, Replication, Translation In eukaryotic cell, where can protein synthesis occur? - ANS both cytoplasm and rough endoplasmic reticulum (ER) In Eukaryotes, the ________ of the mitotic spindle often span the entire region between two poles containing _______. - ANS microtubules, centromeres What is glycosylation? - ANS the addition of sugars to proteins Which of the following signal sequences would you expect to find in the polypeptide that will eventually allow facilitated diffusion of Ca2+? - ANS a transmembrane anchor signal The concentrations of cyclin-dependent kinases are ____ just before the cell cycle checkpoint they regulate and ____ after the checkpoint has been passed. - ANS unchanged; unchanged Insulin is a protein hormone that helps control the level of glucose in the blood. It is secreted using exocytosis from specialized cells in the pancreas. Based on this information, which path does the insulin protein take from synthesis to the outside of the cell? - ANS Rough ER -- vesicle -- Golgi apparatus -- vesicle -- exterior of cell An inhibitor of exocytosis will block which one of the following processes? - ANS release of digestive proteins modified in the Golgi to the outside of the cell A eukaryotic cell undergoing mitosis contains the least amount (mass) of DNA during which phase of the mitotic cell cycle? - ANS G1 phase Which of the following signal sequences would you expect to find in the polypeptide that will eventually fold to become a histone protein? - ANS an internal nuclear localization signal peptide Microtubules and their associated motor proteins are responsible for: - ANS movement of chromosomes When cargo moves in the plus direction versus the minus direction alone microtubules, different motor proteins are used for Esch different direction - ANS True Which of the following represents the expected ratio from the cross of a heterozygous for dominant and recessive allele of two genes and another individual who is homozygous for recess alleles of both genes? Assume that the genes are on separate pairs of autosomes. - ANS 1:1:1:1 A human zygote contains 45 chromosomes instead of the usual 46. This can be caused by? - ANS failure of an egg to completes meiosis II Human trisomy for the X chromosome is better tolerated than trisomy for the autosomes because? - ANS extra X chromosomes turn into Barr bodies Which of the following represents the expected ratio of offspring phenotypes from the cross of an individual who is homozygous for the dominant allele of an autosomal genes with an individual who is heterozygous for the dominant and recessive allele of the gene? - ANS 1:0