Answer:
The correct answer will be options
1. The position of the tropomyosin threads shift
2. Exposing myosin binding sites
3. Allowing the myosin head to attach to the actin filament
Explanation:
Calcium plays an important role in the contraction of muscles especially in the formation of the cross-bridge between myosin and actin filaments.
In the presence of calcium, myosin head binds the actin filament as calcium binds to the troponin which changes the configuration of the troponin which releases the tropomyosin from the myosin-binding site on actin.
Once the myosin binding site is freed, myosin binds the site and causes muscle contraction due to ATP hydrolysis.
Thus, the selected options are the correct answer.
A) Stone
They used materials they were available to them which was majorly limestone which is a type of stone.
DNA starts off on the nucleus where it then gets separated into DRNA so that it can travel to other parts of the cell. It is the. Carried by vehicle to the rough ER where ribosomes are added to it then it goes to the smooth ER where waste is expelled. Finally, it goes to the Golgi apparatus where it is either stored or carried to a part of the cell.
The position within the original arginine codon where the point mutation most likely occurred was the second nucleotide. In this case, the mutation was CGA >> CAA.
<h3>Mutations and codons</h3>
A mutation is any alteration in the nucleotide sequence of an organism.
A point mutation is a single base substitution that doesn't change the open reading frame of a given protein.
In this case, the CGA codon encodes for Arginine, whereas the CAA codon encodes for Glutamine, thereby the mutation likely occurred in the second base (C<u>G</u>A >> C<u>A</u>A)
Learn more about mutation here:
brainly.com/question/17031191
