A) <u>Mutation</u> is the original source of variations for plants and other organisms which develops differences among their respective species
Explanation:
Genetic variation leads to the natural differences between each individual and among individuals of a species. The main cause for this variation is due to alleles that cause variations in the composition of genes or the DNA sequences.
A mutation is a genetic variation which leads to the creation of a new allele in a species population. Each variation in the DNA sequence leads to an allele formation and each allele leads to a difference in character or trait between individuals since they are the alternate version of the original genes.
Although genetic variations could be brought about by crossing over, random fertilization, or independent assortment; mutation is the original source because it provides the basic raw material for all the evolutionary changes.
Answer:
a) Acetylcholine is degraded by acetylcholinesterase.
Explanation:
After it binds for its receptor on the plasma membrane of the postsynaptic cell, acetylcholine must be removed in order to prevent repeated stimulation. Acetylcholinesterase is enzyme for the inactivation of acetylcholine, present at all cholinergic synapses. This enzyme hydrolyses acetylcholine and breaks it to the acetate and choline. Choline can be reused for the synthesis of the new acetylcholine molecule so it is taken back into the presynaptic cell.
Answer:
1. Autotroph 2. Calvin Cycle 3. Carotenoid pigment 4. Chlorophyll 5. Chloroplast 6. Photosynthesis 7. Radiation
Explanation:
Answer: a review of the students’ school transcript
Explanation:
A mineral is a naturally occurring inorganic solid that has a fix chemical composition.
Another naturally occurring solid substance is Rocks.
Rocks are different from the Minerals as they are composed of several minerals and have different proportion of chemical compounds present in them along with some organic components also.
Explanation:
- Minerals have a fix chemical composition and are classified as metallic minerals, non metallic minerals and mineral fuels.
- Minerals are of immense use as they are the source from which pure elements can be obtained.
- Some examples of common minerals are Magnetite an ore of irone, Bauxite an ore of aluminium, Limestone, coal an example of mineral fuel.