Answer: nitrates
Explanation:
Nitrogen fixation involves the conversion of atmospheric nitrogen into ammonia and organic derivatives, by natural means, especially such conversion, by microorganisms (nitrogen fixing bacteria) in the soil, into a form that can be assimilated by plants.
The easily accessible form by which nitrogen can be obtained by plants is nitrates, as they are very soluble in soil water and easily picked by plant root vessels
Answer: Option b) Community
Explanation:
A community refers to the entire group of living organisms in an specific area, living together and relying on one another for nutrients, shelter, protection etc.
Thus, a community usually cover more than one kind of organism. An example of community is the organisms in a swamp, which include plants, animal and microorganisms.
The given question is incomplete. The complete question is:
Question: When a neuron responds to a particular neurotransmitter by opening gated ion channels, the neurotransmitter is serving as which part of the signal pathway?
A) relay molecule
B) transducer
C) signal molecule
D) response molecule
Answer:
C) signal molecule
Explanation:
Signaling cells produce specific chemicals or compounds called signaling molecules. These signaling molecules arrive at their target cells and bind to the cell surface or intracellular receptors. Binding of the signaling molecules to their receptors present on the target cells is followed by signal transduction and production of desired response by the target cells.
Neurotransmitters serve as signal molecules that bind to the receptors present on the membranes of the postsynaptic neurons to bring about changes in the membrane potential. Their binding may trigger the opening of the gated ion channels resulting in a change in the membrane potential followed by generation of inhibitory or excitatory responses.
Answer:
<u><em>DNA is made of repeating units called nucleotides.</em></u>
Explanation:
DNA can be described as a double helix molecule made up of long polymer chains of nucleotides. The nucleotides which are present in a DNA are:
Adenine (A)
Guanine (G)
Cytosine (C)
Thymine (T)
The hydrogen bonds which occur in the pairing of nucleotides makes the double helix structure of DNA.
Adenine forms hydrogen bonds with Thymine.
Guanine forms hydrogen bonds with Cytosine.
The backbone of the DNA is made up of sugars and phosphates
The pressure exerted on a surface by an object increases as the weight of the object increases or the surface area of contact decreases. ... Pressure exerted by ideal gases in confined containers is due to the average number of collisions of gas molecules with the container walls per unit time.
