What Gram reaction do you expect from acid-fast bacteria?
a. Gram-positive
b. Gram-negative
c. Both gram-positive and gram-negative
d. Can't tell
Ans: a. Gram-positive
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Restriction fragment length polymorphisms (RFLPs) are used to ____
a. test the effectiveness of different restriction enzymes on a sequence of DNA b. compare the DNA sequences between individuals by looking for changes in restriction enzyme digest patterns c. compare the full DNA sequences of two individuals d. prepare DNA for further sequence analysis e. treat sickle-cell anemia
Which of the two gases, oxygen or carbon dioxide, is present in the oceans in much greater proportions than in air? Why might this be the case?
What will be an ideal response?
Why did the alleles that conferred insecticide resistance in mosquitoes become less frequent in the population when insecticide application was discontinued in the 1960s in Thailand?
A) The mosquitoes experienced a bottleneck and by chance the surviving insects had a low proportion of resistance alleles. B) The resistance alleles were linked to a body color variation that led to resistant mosquitoes experiencing a higher rate of predation. C) A mosquito population with a low proportion of resistant alleles migrated to Thailand and interbred with the original population. D) In the absence of pesticide, mosquitos homozygous for the resistance alleles had lower fitness than the other genotypes.
Regarding the ABO blood group system in humans, if an individual is genetically IBIO and yet expresses the O blood type, which genotype is the individual likely to have?
What will be an ideal response?