Answer: All of the statements are true.
Explanation:
Purines are biologically synthesized as nucleotides and in particular as ribotides, that is, bases attached to ribose 5-phosphate. Adenine and guanine are both derived from the nucleotide inosine monophosphate (IMP), which is the first compound in the pathway to have a completely formed purine ring system.
Purine nucleotides can be synthesized in two distinct pathways. First, purines are synthesized de novo, starting with simple starting materials such as amino acids and bicarbonate. the purine bases are assembled already attached to the ribose ring. Alternatively, purine bases, released by the hydrolytic degradation of nucleic acids and nucleotides, can be salvaged and recycled. Purine salvage pathways are mostly noted for the energy that they save and the remarkable effects of their absence.
All statements are correct because the organization of purine synthetic enzymes involves multifunctional enzymes, reversible enzyme formations, through out the sequence there is maintenance of high local concentration and the ten steps requires only six enzymes.
Answer:
In the ABO series, the gene for blood type O is<u><em> recessive</em></u>, while A and B are <u><em>dominant </em></u>genes, and AB is <u><em>co-dominant</em></u>.
Explanation:
According to the ABO blood system, the A blood group might have the genotype AA or AO. The B blood group might have genotype BB or BO. The O blood group will have the genotype OO. The Ab blood group will have genotype AB, A, B or O.
The O is the recessive allele but a person with O blood type can transfer blood to all other blood types. The AB is co-dominant and it can accept blood from all other blood types.
Any specimen that is not handled properly may result in erroneous test results due to variables at pre-examination phase of laboratory testing.
A laboratory is a place where experiments and researches are performed. These scientific laboratories have a set of rules and protocols that are essential to follow to obtain the perfect results. A laboratory can be at school level, university level or even at industrial levels.
A specimen is defined as as the substance that is studied in the laboratory to obtain certain results or to make a new discovery. In biology, specimens can be living or dead organisms, cells, tissues, fluids, etc.
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Answer:
Gravity, electricity, and magnetism are considered non-contact forces because they do not physically act on objects.
Explanation:
Gravity, magnetism, and electricity all use fields to act on objects without actually touching them. They can all force objects to move without touching them through these fields.