The instructions for assembling polypeptides are contained in dna. consequently, mutations in dna sometimes affect protein structure. a mutation will initially affect a protein’s primary structure, but changes at higher levels of structure may follow.
point mutations are mutations that affect a single nucleotide pair in dna. the figure below shows different types of point mutations and the effects they have on protein primary structure.
in this activity, you will examine three different mutations.
a) drag the white and purple labels to the white targets to indicate what each mutant mrna codon codes for. (you will probably need to consult the codon table for mrna)
b) drag the pink labels to the pink targets to indicate the type of mutation.
c) drag the blue labels to the blue targets to indicate the effect on the polypeptide’s primary structure.

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.  

i thinking chemical change

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms