ASU BIO 181: EXAM 2 Questions with 100% correct Answers

Which strand is produced more rapidly? - ANSWER-Leading strand During DNA replication in the lagging strand there is production of this component? - ANSWER-Okazaki fragment How many "stop" codons exist? - ANSWER-3 The double helix of DNA is wrapped about 1¾ times around which of these components? - ANSWER-Nucleosome Which enzyme unwraps the double helix? - ANSWER-Helicase In the ribosome, what is the name of the bond that links one amino acid to the next? - ANSWER-peptide bonds List the two basic categories of nitrogenous bases in nucleic acids. - ANSWER-purine and pyrimidine In DNA, what does the nucleotide labeled as A pair with? - ANSWER-Thymine During DNA replication is greatly reduced by enzymes that proof read the newly replicated DNA. - ANSWER-True How many hydrogen bonds are there between an A and its paired nucleotide? - ANSWER-2 During mRNA maturation what is the name of the part of the mRNA that is removed? - ANSWER-introns DNA replication in eukaryotes is sped up by multiple origins of replication. - ANSWER-true RNA synthesis, also called RNA transcription occurs in three phases. List them from beginning to end in order. - ANSWER-initiation, elongation, termination Which nucleotide is different in RNA compared to DNA? - ANSWER-uridine There are two types of protein synthesis in eukaryotic cells. These two types can be distinguished because the polyribosome is either or . - ANSWER-free; membrane bound In eukaryotic cells the start codon for protein synthesis is . - ANSWER-Aug Draw the sugar in DNA and label the carbons as discussed in the lecture. Then circle the carbon that is different in RNA. - ANSWER- Which sugar is present in RNA? - ANSWER-ribose For DNA Polymerase III to work which of these components has to act first? - ANSWER-Primase RNA is double stranded. - ANSWER-False In the lagging stand, the DNA is read from the parental DNA's 3' to 5' end. - ANSWER-True Which enzyme is used first to permit DNA polymerase III to begin replicating the 3' strand? - ANSWER-Primase Strands of the backbone of DNA are parallel? - ANSWER-False The DNA polymerase that replicates the parental strand of DNA reads the parental DNA from 5' to 3