BIOD 210 Module 5 Exam (New, 2023-2024) / BIOD210 Module 5 Exam: Portage Learning, Exams of Nursing

Download BIOD 210 Module 5 Exam (New, 2023-2024) / BIOD210 Module 5 Exam: Portage Learning and more Exams Nursing in PDF only on Docsity! Module 5 Exam - Requires Respondus LockDown Browser + Webcam Due No due date Points 100 Questions 23 Time Limit 60 Minutes Requires Respondus LockDown Browser This quiz is currently locked. Attempt History Attempt Time Score LATEST Attempt 1 60 minutes 57 out of 100 Score for this quiz: 57 out of 100 Submitted Nov 18, 2021 at 11:26am This attempt took 60 minutes. 0 / 6 ptsQuestion 1Unanswered Consider the following DNA sequence: 3’-AAC TAC TGT GTA -5’ a. Write out the complementary RNA sequence, including the 5’ and 3’. b. Translation starts on which end of the RNA (5’ or 3’)? c. Identify the start codon in the complementary sequence you wrote in part a. of this question. 2/15/22, 8:51 PM Page 1 of 15 Your Answer: a. 5’-UUG AUG ACA CAU -3’ b. 5’ c. AUG 2 / 2 ptsQuestion 2 True or False: Transcription of DNA into mRNA does not require an RNA primer. True Correct! False 3 / 6 ptsQuestion 3 Your Answer: Why must the DNA within eukaryotes be complexed with histone proteins, but not in bacteria? What happens to these complexes during DNA replication? 2/15/22, 8:51 PM Page 2 of 15 The wobble hypothesis allows for flexible base-pairing rules in the third position of a codon. In several cases, the first two bases are the same for a specific amino acid, and the third position can be any of the four bases. Because there are only 40 tRNAs to encode amino acids for 60+ codons, the wobble hypothesis allows for some degeneracy in the coding, whereby one tRNA can recognize several codons to encode one amino acid. 4 / 4 ptsQuestion 6 Your Answer: Fill in the Blank: The ___(1)____ element is a __(2)___-acting element that is located upstream from the site of transcription initiation. pribnow box cis 1. Pribnow 2. cis 2/15/22, 8:51 PM Page 5 of 15 2 / 2 ptsQuestion 7 True or False: A silencer element is always located close to the gene that it affects, but an enhancer element can be far away. True False Correct! 2 / 2 ptsQuestion 8 True or False: Once a polymerase is moving forward along a nucleotide chain, the ability to stall and reverse direction if things go wrong is called proofreading. True Correct! False 4 / 4 ptsQuestion 9 Fill in the Blank: In the process of RNA ______, exons are joined together to make mature mRNA and ______are removed from the pre-mRNA. 2/15/22, 8:51 PM Page 6 of 15 Your Answer: splicing introns splicing; introns 6 / 6 ptsQuestion 10 Your Answer: How does alternative splicing enhance the diversity of the genetic code? it producing different mature mRNAs from pre-mRNA by linking the exons in a different combination Alternative splicing means that different combinations of introns can be spliced out of a single mRNA, producing multiple different mature mRNAs. Therefore, several proteins can be encoded from the same nucleotide chain. 0 / 8 ptsQuestion 11Unanswered 2/15/22, 8:51 PM Page 7 of 15 Shine-Delgarno The complex of ribosome subunits + ribosomal proteins.You Answered Bacterial mRNA sequence just upstream of the start codon. Correct Answer Kozak sequence Eukaryote mRNA sequence of A or G upstream of initiation.Correct! 0 / 2 ptsQuestion 13 True or False: The Shine-Delgarno or Kozak sequence is the initiation sequence for translation True You Answered False Correct Answer 6 / 6 ptsQuestion 14 Why is the mRNA of eukaryotes protected much more so than that of bacteria? 2/15/22, 8:51 PM Page 10 of 15 Your Answer: in the eukaryoyes mRNA allows the strands to be preserved so that they can be translated many times more than bacteria and they are more complex than bacteria and atructurak componets of th cell are made of of larger quantities The mRNA of eukaryotes is preserved for up to 10 hours, which is much longer than its counterpart in bacteria. An abundance of proteins needs to be produced in eukaryotic cells (because they are huge and complex), so the long-lived mRNA allows proteins to be translated many times before it is degraded. 1 / 2 ptsQuestion 15 Your Answer: Fill in the Blank: The nucleotide sequences on the ends of chromosomes that protect the genome from nucleolytic degradation, unnecessary recombination, repair, and interchromosomal fusion are called _______. telomerase Telomeres 2/15/22, 8:51 PM Page 11 of 15 3 / 8 ptsQuestion 16 Your Answer: Why do scientists believe that telomere shortening has a strong correlation with aging? because as you age they get shorter diseases and other things start to happen which comes with older age It is believed that over time, the telomeres are shortened, and eventually, the ends of the chromosomes start to shorten. When a large amount of chromosomal damage occurs, the cell goes into a state of senescence whereby the metabolic function of the cell becomes very inefficient. Some scientists believe that this shortening is associated with the phenotypes that are associated with typical aging. 0 / 2 ptsQuestion 17 True or False: The large subunit of the ribosome is responsible for recognition of the codon sequences as the mRNA comes through the ribosome. It contains both the aminoacyl and the peptidyl sites. True You Answered 2/15/22, 8:51 PM Page 12 of 15