Question

Vertebrates have many types of connective tissue that serve different functions within an organism due to their different mechanical properties. Which of the factors listed below can contribute to the tissue-specific structural properties of connective tissues in animals? Choose all that apply. The ratio of collagen to glycosaminoglycans The extent of crosslinking between pectin and cellulose.. The alignment and organization of collagen fibrils and fibers. The presence of minerals, such as calcium phosphate.

Answer 1

1.

The ratio of collagen to glycosaminoglycan ratio

Allignment and organization of collagen fibrils and fibers.

The presence of minerals such as calcium phosphate.

The above are the right statements.

Collagen, minerals, arrangement of collage fibers give strength to a tissue. Ratio of collagen to glycosaminoglycans also is important in deciding the firmness of a tissue. Blood is so thin because it has lot of water rather than GAGs.

2.

They do not requre extracellular signals to stimulate their proliferation.

Unlike embryonic stem cells these cells can produce only one or two types of terminally differentiated cells.

They are present in small numbers even cells which under go rapid renewal like the intestinal epithelium.

The above two are false statements. This is because all stem cells need signal for proliferation.

Stem cells can differentiate in to many types of cells. example is bone marrow which can form variety of blood cells.

Present study shows that there are a lot of stem cells present in the adult body.