Transcribe and translate the dna sequence using the codon wheel.

dna: aaa gag ggg

what is the amino acid sequence? remember to use the mrna sequence for the codon wheel. write the three letter abbreviation in the blank.

UUU CUC CCC

Explanation: Since it is a mRNA translation  you would not use thymine, because you are not making a complimentary base DNA, instead since you are making an mRNA sequence you would use Uracil in place of thymine. Adenine (A) will translate to Uracil (U) and Thymine, if included in the original DNA sequence, would translate to Adenine (A) and Guanine (G) will translate to Cytosine (C) and Cytosine (C), if included in the original DNA sequence, will translate to Guanine (G).

the answer is: the „power stroke“ step.

muscle contraction can be divided into a few steps:

1. the release of ach (acetylcholine) in the synaptic cleft, binding of ach for its receptor and consequently opening of the ca channels.

2. the release of ca, binding of ca for the troponin

3. troponin shifting the tropomyosin, which was blocking the active site on the actin

4. myosin heads attaching to actin by breaking down atp to adp+ pi

5.   formation of the ‘cross-bridge’ on the active site of the actin filament by myosin head

6. “power stroke” -the cross bridge pulls actin, which slides over the myosin

9.     7. the release of adp completes the cross-bridge movement and atp attaches to myosin, breaking the actin-myosin cross bridge.