The sole reason why red blood cells are unable to replace damaged proteins is that red blood cells lack DNA and cell organelles such as nucleus, ribosomes and mitochondria which are crucial for protein synthesis, assembly and repair. In other words they lack both the information and the machinery for making or repair of proteins.
Due to lack of DNA and cell organelles, red blood cells cannot be able satisfy the central dogma which summarizes synthesis of proteins as DNA → RNA → proteins.
DNA has the genetic information on how proteins should be made, RNA is responsible for transferring the information from DNA in the cell nucleus to the ribosomes in the cytoplasm, then translating or decoding this information, which results in the making of protein.
<span>Since the child has never been away from his parents and siblings and also he is only 4 years old it is better to have one of them stay with the child. The presence of a family member will reinforce trust and provide support to the kid.</span>
1. The correct answer is option A
The thickest layer is Dermis which is made up of two layers papillary and reticular. The reticular dermis is the lower layer of the dermis and is made up of dense irregular connective tissue featuring collagen fibers.
2. The correct answer is option E
Bone is composed of fibrous and mineralized connective tissues which is enriched in collagen and calcium phosphate.
3. The correct answer is option C
Muscles are composed of two major protein filaments: a thick filament composed of the protein myosin and a thin filament composed of the protein actin. These two filaments slide over each other to repetitively contract the muscles.
Answer:
Explanation:
Parrotfish spend 90% of their day cleaning the reef of algae. This cleaning (eating) helps corals grow and thrive, and healthy reefs support more fish in the sea. ... They snack on the hard parts of coral which becomes a white sandy material in their stomachs that they leave behind on the reef.
The sneezing is release of air that helps the body to get rid of irritants in our nose and throat, like allergens, dirt, and dust.
Coughing is by forcing the air out of the lungs with high pressure, to clear the throat of these foreign particles.
