The answer is D. All the above
Explanation:
Eukaryotic cell
Eukaryotic cells have DNA, and prokaryotic cells do not.
Eukaryotic cells have both membrane-bound organelles and nuclei, while prokaryotic cells have neither
Prokaryotic cell
Prokaryotic cells have membrane-bound organelles, and eukaryotic cells do not.
Prokaryotic cells have nuclus and eukaryotic cells do not.
Answer:
A and F are phosphate groups.
B and E are sugars.
C and D are nitrogenous bases.
Explanation:
Nucleotides are the molecules responsible for composing DNA and RNA. They are formed by three units: a phosphate group, a sugar molecule and a nitrogenous base.
The sugar molecule is a pentose, which means that it is a molecule formed by 5 carbons. These collections are represented by geometrical figures such as the letters "B" and "E" shown in the figure above, where each tip represents a carbon.
The nitrogenous bases are molecules that are named adenine (A) and guanine (G) and the pyrimidine bases cytosine (C), uracil (U) and thymine (T).
The phosphate group, in turn, is a molecule derived from phosphoric acid and is the only one that does not vary in each nucleotide.
Explanation:
Keratin are important for the structural integrity, cell function and the movement and the proliferation of the cell and healing of the wound. Different tissues in the body contains different combinations of the keratin proteins which play specialized roles.
Keratin has two major function in the skin -
- <u>To hold the cells present in the skin together and form a barrier</u>
- <u>It means the outermost layer of the skin which protects it from environment. </u>
- <u>It also prevents the tearing of the skin.</u>
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.
