Answer:
1. Nerve impulse
2. Neurons
Explanation:
Neurotransmitters are compounds with low molecular weight. They are secreted by axon terminals of the neurons. The released neurotransmitters then bind to the receptors located on next neuron or on the surface of muscle cell.
The function of neurotransmitters is to carry the nerve impulse from presynaptic neuron to the postsynaptic neuron or from neurons to the effector organs such as muscles and glands.
For example, neurotransmitters are released into the synaptic cleft to transmit the nerve impulse between neurons.
Answer:
A catalyst speeds up a chemical reaction, without being consumed by the reaction. It increases the reaction rate by lowering the activation energy for a reaction.
Explanation:
<h3><u>Answer;</u></h3>
Ectoderm
During gastrulation in frogs, cells from the animal pole spread over the embryo and form the <u>ectoderm</u>.
<h3><u>Explanation</u>;</h3>
- <em><u>Gatrulation is when the three germ layers form around the embryo in preparation for the next step of embryogenesis, that is organogenesis. The three germ layers namely; ectoderm, endonderm and mesoderm are the basis of all the organs that will form after this stage.</u></em>
- Ectoderm is the outermost layer, which later froms may different lining such as the outer layer of the skin, esophagus, and many other organs. Endoderm is the inside layer of gastrula and forms the digestive tract of the embryo. Mesoderm is the middle layer and ends up becoming the skeletal muscles of organisms as well as bones, blood, and sex organs.
Receptor potential is generally at the receiving region. The receptor potential(also called generator potential) can work to trigger an action potential either within the same neuron or adjacent cell.Within the same neuron the receptor potential causes local current flow to the region responsible for action potential.
Answer:
Test Tube 2 (<em>S. sonnei)</em>
Explanation:
Triple sugar iron agar test is the microbiological assay used to test the fermentation reaction performed by the bacteria. The fermentation process differs based on substrate and the acids formed as a byproduct.
The test is based on the byproduct formed as a result of fermentation. The test tube contains 1% lactose, 1% sucrose and 0.1 % glucose, ferrous sulphate, phenol red pH indicator.
When the bacteria ferment any of the three sugar, the medium turns yellow.
In test tube 1- The tube shows pink slant, pink butt and no black precipitate which indicates that no fermentation took.
In test tube 2- the tube shows pink slant, yellow butt and no black precipitate due to fermentation of Glucose only due to alkali acid reaction.
In test tube 3- the tube shows yellow slant and yellow butt which shows that glucose and either lactose or sucrose has been fermented.
Thus, test tube 2<em> (S. sonnei</em>) is the correct answer.
