Answer:
b). activation of T cells
Explanation:
An APC (antigen-presenting cell) can be described as an immune cell, which detects, uptakes, and informs the acquired immune response when an infection takes place. B cells, macrophages, and dendritic cells are antigen-presenting cells.
These cells play an important role in activation of T cells. T cells are unable to recognize soluble or free antigens and can only recognize antigens processed and presented by carrier molecules, such as MHC molecules.
Presence of MHCII molecules is a defining feature of APCs that process and present antigens to T cells. Hence, all antigen-presenting cells help in activation of T cells.
Thus, the correct answer is option (b).
Answer:
B) the number of different kinds of organisms present
Earthquakes happen hope it helps
1.To produce organisms with new traits, breeders can introduce mutations (usually in bacteria) using radiation or chemicals, or they can create polyploid plants. Polyploidy describes an organism with multiple sets of chromosomes.
2.An outline of the relationship between mutations and genetic variation. A mutation is known to be a natural process in which theDNA sequences is changed in a living organisms. Although, genetic variation is the change in both alleles and genes, both throughout and amongst the population.
3. Assuming the traits are recessive, and this is not a case of incomplete dominance, begin crossing any plants you have. Hopefully, you will have two heterozygous plants (for both traits) and will see at least one trait show recessive in one of the progeny. If you are lucky, you will get two plants, one recessive for red flowers, one recessive for short stems. Cross the two, and you will get a completely recessive individual.
The correct answer is: True
