How can a liquid be drawn into a pipette safely?

Biology

1 answer:

GalinKa [24]3 years ago

7 0

By pushing on the top of it and the water or substance will get into it

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All 4 of the macromolecules that make up living things are all _____ based

inn [45]

Im pretty sure it’s carbon but it may also be oxygen depending on which living things they’re referring to

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Scientists have identified dozens of pheromones used by honeybees for communication. Which type of sensory system are pheromones

OlgaM077 [116]

Answer:

Explanation:

Chemoreception is a physiological process where an organism reacts to a chemical stimulus in their environment.

Pheremones are chemical substances that organisms release into their environments as a form of communication.

Pheremones bind to chemoreceptors which causes a response once the nervous system of the bee has analyzed and identified the chemical substance. The bee can then react with further communication.

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Power stroke (myosin head bends) coupled with the release of ADP and phosphate, ATP hydrolyzed to ADP and Phosphate and the Myos

svetlana [45]

Answer:

Power stroke (myosin head bends) coupled with the release of ADP and phosphate

Explanation:

Muscle contraction results from myosin heads adhering to actin and attracting it inwards. It uses ATP. Myosin adhers to actin at a binding site of its globular actin protein and adheres at another binding site for ATP (hydrolyzed ATP to ADP, Pi and energy)

ATP binding prompts myosin to detach from actin, ATP is changed to ADP and inorganic phosphate, Pi by ATPase. The energy formed at this process orientates myosin head to a “cocked” direction.

The myosin head goes in the direction of the M line, holding the actin with it in the process causing the filaments to orientate nearly 10 nm in the direction of the M line--- power stroke (force is produced), the sarcomere reduces in length and the muscle contracts.

Note: The power stroke is seen when ADP and phosphate disattaches itself from the myosin head.

At the terminal point of the power stroke, the myosin head as low-energy, followed by ADP release.

The attached image shows the cross-bridge muscle contraction cycle, which is activated by Ca2+ sticking to the actin active site. And how actin moves in relation to myosin.