Student A who believes viruses are non living organisms.
Explanation- Viruses are not made out of cells, they can't keep themselves in a stable state, they don't grow, and they can't make their own energy.
Answer:
D. Calcium ions.
Explanation:
Here we are talking about the mechanism of muscle contraction. The most accepted theory of muscle contraction is sliding filament theory. It was given by Huxley and Huxley. During the process actin filaments slides over myosin filament by forming cross bridges. The sequence of events are as follows:
a. An action potential propagates through the motor nerve and reach the nerve endings on the muscle fiber at neuro-muscular junction.
b. Neurotransmitter called acetylcholine is released by the nerve endings.
c. Acetylcholine binds to the receptors on muscle fiber and opens the gated channels which causes flow of Na+ ions into the muscle fiber.
d. This influx of sodium ions initiates an action potential in the muscle fiber which reaches the T- tubules or transverse tubules. Here it causes the sarcoplasmic reticulum to release large amounts of calcium ion.
e. Calcium ions are responsible for initiating the attractive forces between actin and myosin filaments. Cross bridges are formed, actin slides over myosin causing the contraction of muscle.
<span>The Law of Independent Assortment. Which actually only applies if the examined traits are not linked to the same locus.
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<span><span>1.bulbsBanana trees and bamboo have these horizontal stems that can divide and grow in several directions at once.</span><span>2.cormsGladiolus and freesia plants have these special stems that are short and fleshy with a bud for growth of new stems and leaves and an area on the bottom for root growth.</span><span>3.rhizomesThese are fleshy, enlarged stems like the potato.</span><span>4.stolonsOnions and garlic reproduce using these.</span><span>5.tubers<span>Strawberry plants and Bermuda grass have these stems that produce other stems and leaves on top and roots on the bottoms</span></span></span>
