Site-specific recombination systems all of the choices are correct i.e.
A. do not depend on extensive nucleotide sequence homology.
B. depend on enzymes that are often specific for sequences within the host.
C. are features of some viruses.
- An exchange between two specified sequences (target sites), either on the same DNA molecule or on two separate DNA molecules, is known as site-specific recombination.
- DNA sequences may be integrated, excised, or inverted as a result of the exchange.
- A site-specific recombinase that can work by itself or with the aid of additional components or enzymes shapes the DNA target during recombination.
- The recombinase is chemically bonded to the ends of the intermediate DNA after DNA breakage at the recombination site; when this process is reversed, the intermediate DNA is resealed to form the recombinant and the recombinase is released.
- During this recombination process, neither replication nor repair are necessary.
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The correct answer is bpa in bottles affects particular glands.
An endocrine disruptor is a chemical which at certain doses can disrupt the normal endocrine function of the organism. The effects of an endocrine disruptor can be quite severe, from birth deficits and cancerous tumours to developmental disorders.
One of the most commonly detected chemicals in the human body is bisphenol A (BPA), a material used in the production of plastics. It is considered an exoestrogen, meaning that it possesses hormone- and estrogen-like properties. These properties affect specific glands of the human body causing reproductive and neurological problems, obesity, diabetes and some types of cancer.
Feedback from estrogen is a mechanism that the human body uses to control the FSH release from the gonads. This is not considered an endocrine disruptor since it is a natural mechanism. In addition, iodine is a chemical element essential for the synthesis of thyroid hormones. Any lack of it is not considered an endocrine disruptor. Finally, calcitonin is a hormone produced in humans by specific cells of the thyroid gland and it is not considered an endocrine disruptor.
Answer:
What causes genetic variation?
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).
Explanation:
PLZ mark brainliest also I hope this helps
Mitochondria are the powerhouses of the cell because they break the chemical bonds of glucose to release energy that our cells use to do work and perform chemical reactions.
