Here is the answer. In the sliding-filament model, if myosin did not attach to actin filaments, what happens is that, the muscle would be permanently relaxed. Myosins work with actins and these are motor proteins. Hope this is the answer that you are looking for.
I would say true because for them life will not go on and the animal that is eating another animal there will not be no more of them and they will all die off
Answer:
The correct answer is D. is a system that differentiates self from nonself to neutralize harmful invaders.
Explanation:
A defense system that protects the host body from pathogen infection is called the immune system. This immune system is made up of many different barriers which helps in preventing illness from pathogen attack.
Physical and chemical barriers provide the first line of defense to the body for example skin, mucous membrane, lysozyme in saliva provide first line of defence. Second line of defense is provided by non-specific immune cells like mast cells, macrophages, dendritic cells, etc.
The third line of defense is provided by pathogen-specific immune cells like T lymphocytes and B lymphocytes. These cells have the ability to differentiate self and non-self cell and kills the non-self cell that come from outside the body.
Answer:
purine
Explanation:
Purines are nitrogenous base that have two carbon-nitrogen rings. The most naturally occurring purines are adenine and guanine which are found in DNA and RNA as nucleotide building blocks of these polymers. Purines are constituents other important biomolecules, such as ATP, GTP, cyclic AMP, NADH, and coenzyme A. Purine and pyrimidine ribonucleotides built up essential intermediates in the synthesis of the polynucleotides RNA and DNA.
Answer:
B - between 100 and 500 million year old.
Explanation:
Because X is older than the 100 layer but younger than the 500 layer according to the position in the picture.