Answer:
Cytokinesis begins in anaphase in animal cells and prophase in plant cells, and terminates in telophase in both, to form the two daughter cells produced by mitosis.
Explanation:
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On a graph of temperature vs. time, it shows pure substances exhibit a sharp boiling point and a sharp melting point as a horizontal flat line wherein the temperature does not change over time up until all the pure substances boiled or melted. The temperature stays stable at 160°C between 4 minutes and 11 minutes. This horizontal flat line part of the graph is normal of a pure substance. The melting point of a solid substance is usually used to specified if the substance is pure. Likewise, the boiling point of a "liquid" substance can be used to specify if the substance is pure as well.
The study in a Pennsylvania forest reveal about the environmental effects of using DDT reveals that a large number of ladybird were killed due to DDT which caused rise in the population of aphids.
DDT is a chemical that was used for killing the insects and keeping the crops safe and productive. It was later found that it has a worse effect on the lives of other non target organisms like other insects, bird and human as well.
It is also known to be associated with the phenomenon of biomagnification. It is a process of accumulation of harmful chemicals with increase in the trophic level which occurs due to continuous intake of food contaminated with chemicals that is not tolerable and causes serious implication.
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Answer:
The correct answer is: D) the pivoting of the myosin head, which causes actin and myosin to slide relative to each other.
Explanation:
<u>Muscle contraction</u><u> occurs when the sarcomere is shortened.</u> The sarcomere is a structure composed of filaments: the thick ones are composed of myosin, and the thin ones are composed of actin. These two proteins interact with one another to make the sarcomere shorten and produce the contraction of the muscle.
Muscle, in its natural state, is not contracted. This is because <u>the binding sites on actin for the myosin heads are covered</u> by the proteins troponin and tropomyosin.
When the signal for muscle contraction arrives at the muscle, calcium ions are released from the sarcoplasmic reticulum and reach the sarcomere to reconfigure the complex formed by troponin and tropomyosin so <u>the binding site on the actin filament becomes exposed and the myosin head can attach to it.</u>
When an ATP molecule appears and binds to the myosin head, the latter separates from the actin-binding site and moves toward the next actin-binding site with the energy provided by the hydrolysis of this ATP molecule. This is what is called power stroke.
This keeps on happening until muscle contraction is no longer needed and calcium ions are reabsorbed, which will make troponin and tropomyosin cover the actin-binding sites once again.
Answer:
There are two major branches of right coronary arteries
- <em>the right posterior descending artery</em>
- <em> the acute marginal artery</em>
Explanation:
the right coronary artery (RCA) is an artery originating above the right cusp of the aortic valve, at the right aortic sinus in the heart. It travels down the right coronary sulcus, towards the crux of the hear