The answer is B. Enzymes work best within a narrow pH range. High pH levels can denature the enzyme.
<span>Pesticides sprayed on
plants were eaten by small animals, which were later consumed by birds of prey.
The DDT poison harmed both the adult birds and the eggs that they laid. The egg
shells became too thin to with stand the incubation period, and were often
crushed. Eggs that were not crushed during incubation often did not hatch, due
to high levels of DDT and its derivatives.<span> </span></span>
Answer:
A. 0.04
Explanation:
The recessive sickle cell allele comprises 20% of the beta hemoglobin alleles in the African gene pool. Under equilibrium, Hardy-Weinberg's principle states that
p^2 + 2pq + q^2 = 1
Here q is a recessive allele. We know 20/100 is the proportion of q i.e. 0.2
Now since sickle cell allele is recessive only the people having homozygous condition i.e. two sickle cell alleles will be affected by anemia.
Hence q^2 will be the proportion of the population susceptible to anemia.
We know q = 0.2
Hence q^2 = 0.04.