Biology1A-Spring_2005-rine

Biology1A-Spring_2005-rine - True/False: "All...

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True/False: "All biological catalysts are proteins" False, the exception: Ribozymes-RNA found in introns that catalyzes its own excision. 2. From Rao and Johnson's experiment, which of the following observations/conclusions is FALSE? a)A cell in G1 phase fused with a cell in M phase results in a heterokaryon with all condensed chromosomes b) A cell in G1 phase fused with a cell in S phase results in the arrest of the S nucleus c)A cell in S phase fused with a cell in G2 phase results in the arrest of the G2 nucleus. d)M phase cells contain factors which promote premature chromosome condensation e) none of the above Ans b 3. Huntington's Chorea is located near locus 15 on chromosome III in humans. How many loci of this sort are in normal somatic cells? a) 1 human somatic cells are 1n and have only one copy of each chromosome b) 2 human somatic cells are 2n and have only two copy of each chromosome c) 2 human somatic cells are 2n and have two homologous chromosomes in each cell d) 2 human somatic cells are 2n and have two identical copies of each chromosome e) none of these 4. A novel mutation has been discovered that disrupts DNA replication, and thus prevents cell division. The mutation causes RNA to lose its affinity for DNA. Why does this prevent the replication of DNA? a) Free nucleotides are added to the DNA template by tRNA that must bind with DNA to add nucleotides b) A RNA primer must bind to DNA for DNA polymerase to add nucleotides to the 3' hydroxyl end of the preceding nucleotide. c) A RNA primer must bind to DNA, DNA polymerase begins adding nucleotides to the 3' end of the template DNA d) A RNA primer must bind to DNA, DNA polymerase begins adding nucleotides to the 5' end of the template DNA
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e) not enough information to determine. 5. A point mutation occured at two nucleotides within the inton of a gene that codes for the enzyme helicase. Will this effect transcription? a) no, introns are not translated into protein b) no, two point mutations do not cause a change in the DNA sequence c) yes, point mutations can cause a change in the reading frame d) yes, point mutations can lead to the translation of the wrong amino acid e) yes, point mutatoins can lead change a sense codon to a missence codon 6. _______ often accounts for 90% of the eukaryotic cell cycle; it is when ______________. a) Mitosis; a cell divides into two identical diploid daughter cells. b) Interphase; the cell "rests and digests" c) Mitosis; a cell divides into haploid daughter cells d) Interphase; a cell grows and copies chromosomes for cell division e) Spring; the weather is most favorable for cells to build nests. ans: D 7. During cell division, mitochondria act most similar to ________ in that both __________. a) bacteria; divide meiotically.
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Biology1A-Spring_2005-rine - True/False: "All...

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