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q what are the conditions favouring the outbreak of staphylococcal food poisoningbull botulism is caused by the bacteria clostridium botulinumbull
q give the biological effects of aflatoxin and list the various natural toxins present in foodbiological effects of aflatoxin include hepatotoxicosis
q what are mycotoxins and how are they harmfulbull mycotoxins are toxins secondary metabolites produced by filamentous fungi on food and feed that
q prevention and control of staphylococcal food poisoningstaphylococcal food poisoning can be prevented by1 avoiding contamination of food with s
how does the absence of a nuclear envelope in prokaryotes prevent prokaryotes from controlling gene expression by modifying rna after transcription
describe what happens during activation of the lac operon lactose binds to the repressor protein which causes the repressor protein to be released
what is an operon and in what type of organism are operons foundan operon is a series of genes that code for exact products and the regulatory
q conditions necessary for outbreak of staphylococcal foodthe following conditions are necessary for an outbreak of staphylococcal food poisoning1
foods that are frequently incriminated in staphylococcal food poisoning include meat and meat products poultry and egg products egg tuna chicken
staphylococci exist in air dust sewage water milk and food or on food equipment environmental surfaces humans and animals humans and animals are the
describe three ways that rna differs from dna rna is single stranded dna is double stranded all of the codons from the deletion point to the end of
explain why methionine is the first amino acid in every growing polypeptidethe trna that pairs with the start codon on mrna carries methionine rna
staphylococcal food poisoning results from consumption of food containing enterotoxin produced by enterotoxigenic strains of staphylococcus aureus it
q prevention and cure of botulism involvesthe prevention and cure of botulism involves1 strict adherence to safe food-processing practices by the
q conditions necessary for outbreak of botulismthe following conditions are necessary for an outbreak of botulism1 presence of spores of c
the types of foods involved in botulism vary according to food preservation and eating habits in different regions any food that is conducive to
q wound botulismit is the rarest form of botulism the illness results when c botulinum by itself or with other microorganisms infects a wound and
in infant botulism viable botulinal spores are ingested and upon germination in the intestinal tract toxin is synthesized it is confined to infants
adult botulism the symptoms of botulism may develop between 12 and 72 hours after the ingestion of toxin containing foods symptoms include nausea
clostridium botulinum is an anaerobic gram-positive spore forming rod shaped bacteria that produces the potent neurotoxin the organism and its spores
why is it advantageous to have weak hydrogen bonds among complementary bases and strong covalent bonds among phosphate and deoxyribose groups in a
how is dna replication related to cancercancer can result when errors happen in the replication of dna in genes that control how a cell divides a
fumonisinsthe most recently characterized mycotoxins of any major significance in human health are the fumonisins produced by species of fusarium
why is it significant that exact copies of dna are produced during replicationproducing exact copies make sure that when a cell divides the offspring
q strain of fusarium moniliformeit was first obtained from a strain of fusarium moniliforme isolated from southern leaf blight- damaged corn seed