Imagine that you are observing an enzyme-catalyzed reaction in lab. Every time you add more enzyme, the reaction rate increases proportionally until the reaction rate suddenly levels off. No other chemicals were added, and no modifications were made in the experimental setting. Why do you think the reaction rate stopped increasing?
The molecules of substrate noncompetitively inhibited the enzyme.
The molecules of product competitively inhibited the substrate.
The molecules of enzyme were used up in the reaction.
The molecules of substrate were all bound to enzyme.
The enzymes were denatured.
the molecules of substrate were all bound to enzyme
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A researcher proposes that the relationship between a particular bacterial species that produces a fat-soluble vitamin is mutualistic with its insect host. Which of the following procedures would best test the researcher's hypothesis?
A. Design a method to isolate the bacteria from the insect, then mutate the bacteria in the region of DNA that controls vitamin production and compare growth of the mutant and wild-type bacteria on minimal media B. Extract the DNA from the bacteria and from the insect, then use reverse-transcriptase PCR and primers specific to the gene that controls vitamin synthesis to compare transcription of RNA in both organisms C. Determine which insecticide kills the insect without harming the bacterial host, then compare vitamin production by the bacteria from insects treated with the insecticide to those from untreated insects D. Determine which antibiotic kills the bacteria without harming the host, then administer this antibiotic to the insect and compare its growth with and without the vitamin
Metagenomic analysis involves
A) culturing microbes isolated from the environment. B) extracting DNA from cultured microbes. C) analyzing DNA from environmental samples. D) sequencing cloned DNA individually. E) determining culture conditions for different microbes.
Parabasilids are excavates that lack functional mitochondria and lack a Golgi complex
_______________ Indicate whether the statement is true or false.
The common house mouse species, Mus musculus, has the following classification: Musculus, Mus , Muridae, Rodentia, Mammalia, Chordata, Animalia, Eukarya. What part of the name is the family?
A. Rodentia B. Muridae C. Animalia D. Chordata