You notice something is growing in a 100ml pot of liquid soap. you take 1ml of this liquid soap and perform a serial dilution and plate to determine the number of bacteria per 1ml in the liquid soap. on the 1: 100,000 dilution you plate out 1ml and get a count of 37 colonies. how many bacteria were present in 1ml of soap (cfu/1ml)?

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.

convergent boundary.

explanation:

the type of boundary that is depicted in the image above is a convergent boundary.

your awnser is a.gap junctions