BIO 2400 - Genetics Midterm I Exam Questions And Answers

BIO 2400 - Genetics Midterm I Exam Questions And Answers Linear double stranded DNA is typically found in... - ANS eukaryotes All humans (except for albinos) have the same amount of enzyme for skin pigmentation called tyrosinase which converts tyrosine into... - ANS melanin A sample of DNA has a cytosine content of 6%. What is the promotion of thymine? - ANS 44% The primordial reducing atmosphere was drastically changed by the evolution of... - ANS cyanobacteria Eukaryotic genes typically have a_ ______ sequence in their promoter region. - ANS 5'-TATA-3' Transcription termination sequence in eukaryotes. - ANS AAUAAA The random changes in allele frequencies within small populations is known as... - ANS genetic drift The coding portion of our DNA only accounts for about ______ of our total genome. - ANS 1.5% The plasma membrane of all living organisms is composed of... - ANS phospholipid bilayer Lysosomal polypeptides are sorted in the Golgi body and are tagged with _____ residues. - ANS mannose Transcription termination sequence in prokaryotes. - ANS G-C rich hairpin loop Eukaryotic genes typically have noncoding sequences called... - ANS introns Virtually all living organisms use ______ as their start codon. - ANS AUG The ultimate source of new alleles in a population is... - ANS mutation Chloroplasts evolved from cyanobacteria within eukaryotic cells by the process of... - ANS endosymbiosis Some prokaryotic genes that code for several different polypeptides are called... - ANS polycistronic Collectively, lysosomal enzymes are known as _____ and are used for intracellular digestion. - ANS acid hydrolases In all living organisms, the base composition of adenines equals ______, and cytosines equal ______. - ANS thymines; guanines The conditions under which a population does not undergo changes in allele frequency. - ANS Harvey-Weinberg equilibrium Terrestrial life forms did not appear on earth until after the evolution of the... - ANS ozone layer The nucleolus is involved with the synthesis of... - ANS ribosomal subunits One of two sets of an organism's basic complement of DNA. - ANS genome