Answer: is this an question
Explanation:
Some genes only need to be expressed or produced when needed. For example, fibrinogen is a protein that needs to be produced when a person needs to clot. A signal protein 'signals' or tells the DNA to start producing that particular protein. Imagine if the protein was produced all of the time at the same quantities...a person would be prone to strokes and other sicknesses that are caused by blocking the flow of blood to tissue.
Answer:
linker DNA
Explanation:
the classic beads on a string structure is termed as the nucleosome; which is the most basic level of chromosome packaging. the nucleosome is made up of 2 molecules each of the four histone proteins (H2A, H2B, H3, H4) to form an octamer around which a length of DNA is wrapped. linkage of this nucleosome to another nucleosome is done by a length of linker DNA and a linker histone (H1). thus experimentally to produce this structure, the linker DNA between two nucleosomes is degraded by nucleases to extract the structure. thus the linker DNA is not retained after the experiment.
The answer is C.
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B. Both processes form woven bone.
Explanation:
Bone growth and development is mainly characterized by bone ossification processes taking place through the two main osteogenic pathways – intramembranous and endochondral ossification.
The woven bones are the primary immature bones formed by both these ossification processes from the bone cells (osteoclasts, osteocytes, osteoblast) and calcified bone matrix. These woven cells later developed into the mature secondary bones or the lamellar bones – spongy (cancellous) or compact (dense cortical) bones.
Intramembranous ossification takes place mesenchymal sheets of connective tissues and produces soft spongy bones.
Endochondral ossification results in replacement of hyaline cartilage to form the long bones.
