Which (if any) of the following statements about the major histocompatibility complex (mhc) is not correct?
if all of the statements are correct choose the last answer.
a. all human cells, including red blood cells, possess mhc i
b. each person has a unique mhc (except for identical twins).
c. in order for organ transplantation to be successful, the organ donot and the recipient must have a similar mhc
d. the mhc allows the immune cells to differentiate the host cells from "foreign" cells
e. all of the above statements about the mhc are correct.

a. all human cells, including red blood cells, possess MHC I

Explanation:

MHC is a group of genes involved in the immunological recognition of self (cells of the organism) and nonself (exogenous agents), it's found un all nucleated cells of the body, this means it can't be found in red blood cells because they lack a nucleus.

MHC genes are highly polymorphic, this means different alleles exist in different individuals except for identical twins that share the same genetic profile.

When transplantation happens, the organ donor and receiver need to have similar MHC, otherwise, the receptor's dendritic cells will recognize the new organ as non-self molecules. Since MHC are highly polymorphic, choosing a sibling as a donor increases the chances to find a match since the receptor shares genetic information with the donor.

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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.  

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