Biology, 03.02.2020 01:42 abdullaketbi71

Awoman treated her home with a pesticide that kills spiders. the first application killed 78% of the spiders. two months later she applied the pesticide again, but it only killed 45% of the spiders. what would best explain the decrease in the effectiveness of the pesticide?
a. the pesticide only works on mature spiders.
b. once spiders learned how to avoid the pesticide they taught others.
c. the surviving spiders were naturally resistant to the pesticide and that resistance was inherited by their offspring.
d. some of the spiders became able to digest the pesticide due to mutation of the digestive tract.

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Option C, the surviving spiders were naturally resistant to the pesticide and that resistance was inherited by their offspring.

Explanation:

As per the Darwin's theory, the fittest of all survive and hence the spiders that were the fittest at the time of first application of pesticide survived. Being fittest means that they have learned how to survive in an environment consisting of pesticide/or were naturally resistant to the pesticide.

After the first interaction with pesticide, the remaining spiders evolved further with course of time to resist the effect of pesticide. Now when these evolved spiders reproduced, the new born individuals had inbuilt resistance to the similar type of pesticide. This is the reason why only 45 percent spiders died during the application of pesticide for the second time.

Option C is correct.

Answer from: Quest

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

Answer from: Quest

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