Mmsc490 Exam Questions with Complete Solutions

Mmsc490 Exam Questions with Complete Solutions The feature that most clearly distinguishes eukaryotes from prokaryotes is the presence of ......... in eukaryotic cells oxidative phosphorylation, ribosomes, a nucleus, RNA molecules - Answer-A nucleus Cytoplasmic organelles are *present in prokaryotic cells and absent in eukaryotic cells . *absent in prokaryotic cells and present in eukaryotic cells . *absent in both prokaryotic and eukaryotic cells . *present in both prokaryotic and eukaryotic cells - Answer-absent in prokaryotic cells and present in eukaryotic cells . The eukaryotic nucleus contains ............ DNA molecule ( s ) . a single circular a single linear multiple linear multiple circular - Answer-Mutliple linear Stanley Miller applied electric sparks to a reducing atmosphere of methane ammonia , water , and hydrogen , and the resulting products showed that under these conditions , *amino acids can form *amino acids can polymerize into polypeptides *nucleotides can polymerize into nucleic acids *nucleotides can form - Answer-Amino acids can form Which energy - producing process is thought to have come first during cellular evolution ? - Answer-Glycolysis At the time life arose on Earth , Earth's atmosphere contained abundant amounts of all of the following except - Answer-02 CO2 to organic compounds radically changed Earth by producing - Answer-02 RNA is believed to have been the initial genetic system because it can - Answercatalyze the polymerization of nucleotides into another RNA strand . The initial importance of a membrane enclosing self - replicating RNA molecules and associated proteins was that it - Answer-maintained these molecules as a unit capable of reproduction and evolution The bacterial genome is located in a portion of the cell called the - Answer-nucleoid . Eukaryotic cell nuclei contain genes that are - Answer-partly archaebacterial and partly bacterial in origin . Organelles such as mitochondria and chloroplasts are thought to have originated in eukaryotic cells via a process called - Answer-endosymbiosis Mitochondria and chloroplasts resemble bacteria in that they - Answer-reproduce by simple division into two . have their own ribosomes. have their own DNA Which of the following is a colonial organism closely related to the evolutionary precursors of present - day plants ? - Answer-Volvox Which of the following are the most commonly used mammals for genetic studies ? - Answer-Mice In fluorescence microscopy the immediate source of the light detected is light that has been ........... the sample - Answer-emitted by Which of the following is a high - resolution light microscope technique for detecting interactions between proteins ? - Answer-FRET ( fluorescence resonance energy transfer ) How many genes does the haploid yeast nuclear genome contain ? - Answer-6,000 The adult nematode worm Caenorhabditis elegans consists of ..... somatic cells . - Answer-959 The simplicity and clarity of Caenorhabditis elegans allowed researchers to - Answertrace the developmental lineages of all cells in the adult . Drosophila melanogaster was an organism of choice for the study of - Answer-the process of development . Studies on which model experimental organism led to the initial discovery of important mechanisms controlling the development of the animal body plan ? - Answer-Drosophila melanogaster Arabidopsis thaliana is a model organism for studying the molecular biology of - Answer-plants . Which fish is proving to be a useful model organism for the study of vertebrate development ? - Answer-Zebrafish The diffraction limited resolution of a standard light microscope is determined by which of the following equations ? - Answer-R =0.610 (wavelength) / ( NA ) The diffraction limited resolving power of a standard light microscope is approximately - Answer-0.2 μm .