Which safe practice is part of using aseptic technique? O usinga safety shower to wash chemicals off skin and clothing
• wearing protective gloves when transtering bacteria and fungi to slides
O folding and tying up the electric cord of a microscope belore carrying it
O using tongs and a hot mitt to remove a beaker of hot water from a hot plate

answer: a. a gene that causes a specific trait.

density and pressure

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.