Which of the following statements is FALSE? Which of the following statements is FALSE? The variable region of a heavy chain is partially responsible for binding with antigen. The Fc region may attach to a host cell. The variable region of a light chain is partially responsible for binding with antigen. The constant region of a heavy chain is the same for all antibodies. All of the answers are correct.

The constant region of a heavy chain is the same for all antibodies.

Explanation:

Each heavy chain has two regions, known as the constant region, and the variable region. The constant region is different in antibodies of different isotypes but the same in all antibodies of the same isotype.

The variable region of the heavy chain depending on the white blood cells (B cell) that produced it but is the same for all antibodies produced by a single white blood cell. The variable region of each heavy chain is about 110 amino acids long and is made up of a single Ig domain.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation: