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Many infectious diseases are becoming difficult to treat because of bacterial resistance to antibiotics. Populations of bacteria can become resistant when they are exposed to an antibiotic. What is the best general explanation for how this occurs?
a) The antibiotic induces specific mutations in some of the bacteria that make them antibiotic-resistant.b) The antibiotic activates bacterial genes encoding enzymes that can destroy the antibiotic.c) The antibiotic increases the bacterial mutation rate, so that resistant mutant bacteria are more likely to arise.d) Antibiotic-resistant mutant bacteria already present in the population survive and reproduce in the presence of the antibiotic.
A cross is made in a pure-breeding green budgie and a pure-breeding albino budgie. What are the genotypes of the parent birds?
A two year old boy is treated for recurrent fractures of his long bones. Physical examination reveals blue sclera, loose joints, abnormal teeth, and poor hearing.
Since the invention of the first vaccine in the 1700s, there has been controversy whenever a new vaccine is introduced. Are they safe explain your answer.
A is recessive and confers a black coat, A is dominant to a and confers an agouti coat, and A Y is dominant to both and confers a yellow coat.
Suppose a primer initiates the replication process in E. Coli and forms a 20bp (base pair) long stretch. Assume an error rate of 2/1000bp in primer that is taking place only in the lagging strand of DNA during replication.
Mobile pieces of DNA - transposable elements - that insert themselves into chromosomes and accumulate during evolution make up more than 40% of the human genome. Element of four types - long interspersed elements (LINEs), short interspersed elemen..
By studying a large population of sego lilies on side of kinport peak, your colleague is interested in knowing the degree to which global climate change is affecting natural populations in Idaho.
We did an experiment to find total protein concentration by using A260/280 and Bradford Assay Methods. Why was there a difference between the protein concentration recovered from both of these assays?
Explain the lochia in a C-sec as compared to a vag delivery. Name and define the three words that are commonly used to describe lochia in its various forms.
Assume you identify a recessive mutation in the AP endonuclease in yeast. During the diploid phase of their lifecycle, the yeast are viable but haploid strains die rapidly.
If the total free energy of the system X+Y X-Y at 37 C is +6700 J/mol and the total entropy change is -125 J/mol K, what is the total enthalpy change? Also, is the problem endothermic or exothermic and endergonic or exergonic.
Both excitatory and inhibitory neuron form junctions with muscles. By what mechanism do inhibitory neurotransmitters prevent the postsynaptic cell from firing an action potential?
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