Biology question and answers for October 26, 2023
- Q You are interested in obtaining Staphylococcus aureus for a study investigating the prevalence of methicillin-resistant Staphylococcus aureus in the general population. You have received several samples and are ready to...
- Q Why is it possible for human genes to be expressed in bacteria for manufacturing pharmaceutical products such as insulin?Point mutations change a single nucleotide base pairAll organisms use the same...
- Q In Eukaryotic gene regulation, which of the following is part of the transcription initiation complex?General transcription factorsRNA polymerase IISTART codonSpecific transcription factorsRNA polymerase III
- Q In agarose gels, DNA travelsdepending on the nucleotide content of the fragmentfaster for the large molecules than the small onesfrom the positive to the negative electrodefaster for the small molecules...
- Q Sean is thinking about using seawater to water his plants. Sean places 10 spider plants near a window for 20 days. Each day he waters five plants with 10ml of...
- Q tRNAs carrying the correct amino acid recognize the proper codons on the mRNA becausethe amino acid binds to the anticodon of the mRNA and brings the correct tRNA with it.the...
- Q The discovery of restriction endonucleases was crucial to the development of recombinant DNA technology because these enzymesAlways cut DNA at either end of a geneAlways cut DNA leaving unpaired lengths...
- Q What is a key characteristic of a restriction endonuclease?They join broken strands togetherThere are many copies of these enzymes in human cellsThey prevents viral DNA entering the nucleusThey cut DNA...
- Q Bacterial transformation is the process in whichA recessive gene becomes dominantEukaryotic cells are alteredO Foreign DNA is taken up and assimilatedMany copies of a gene accumulate
- Q You have 2 copies of a small gene that you wish replicated by PCR. After 4 replication cycles, how many double-stranded DNA molecules do you have?32826416
- Q During Gram stain, the alcohol...Select all the correct answersdecolorizes Gram-positive bacteriadehydrates the thick peptidoglican and close the pores in Gram-negative bacteriadissolves the outer membrane in Gram-negative bacteriafails to decolorize Gram-positive...
- Q How many times is magnified an image observed using a compound microscope with a 10X ocularand a 40X objective?50 times40 times400 times1000 times
- Q Which of the following mutation is the least lethal form?O Insertion mutationO missense mutationO nonsense mutationO deletion mutation
- Q "After the amount of a specific DNA sequence is increased several fold, DNA can then be analyzed by a procedure that produces a readable pattern of DNA fragments calledPCRgel electrophoresis...
- Q Gene transfer in bacteria by transformation has the following characteristics:a majority of the donor genes are transferredit involves a plasmidit depends on phage infection of the recipient cellit can be...
- Q The Ames test is a screening test used to predict whether a chemical is likely to result inO "spontaneous mutation, cancer"O "spontaneous mutation, antibiotic resistance"O "induced mutation, cancer"O "induced mutation,...
- Q Gene silencing involves all of the following EXCEPTa. small interfering RNAs.b. small interfering RNA binding to mRNA.c. small interfering RNA binding to a gene promoter.d. RNA-induced silencing complex.
- Q The process of discovering gene function from a genetic sequence isa. reverse geneticsb. proteomicsc. bioinformaticsd. metagenomicse. forensic microbiology
- Q What is the purpose of high salt concentration in the mannitol salt agar medium? a. Staphyloccoci ferments the salt in the medium. b. It serves as an indicator. c. It...
- Q What are fastidious microorganisms? a. Organisms that are self sufficient. b. Organisms that do not need enriched medium for growth. c. Organisms that grow at a fast rate.d. Organisms that...
- Q 10 With regard to enzymes why are vitamins necessary for good health Give examples DA
- Q POSSIBLE P Which reaction represents the most accurate model of how matter is transformed and conserved in cellular respiration O CO2 H20 sunlight 02 C6H12O6 CO2 O C6H1206 6026CO2 6H2O...
- Q A Calculating bacterial transformation efficiency requires counting individual colonies and the more that is added the higher the transformation rate pepti doglycan B trans formation solution C DNA
- Q Which statement is FALSE regarding individual colonies selected from the ampicillin amp laced plate A also grows on normal agar B does not have amp resistance C has the gene...
- Q Bacteria growing on a culture plate that exhibits lacks discriminate colonies and exhibits uncontrolled growth A a bacterial lawn B contamination C signs of transformation
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