Answer:
they are used for protection, maneuvering, and to trap food for consumption
Explanation:The spikes of the sea urchin are used for protection, to move about, and to trap food particles that are floating around in the water.
Answer:
b. A second marker in the knock-out cassette, that if inserted into the genome results in cell death when plated on selective media.
Explanation:
General recombination, also known as homologous recombination, refers to the naturally occurring process of exchange of genetic material between pairs of homologous DNA sequences. This process (homologous recombination) can be exploited by genetic engineering to insert DNA segments of interest at target genes. Moreover, a cassette is a mobile DNA segment containing almost a gene and a recombination site, which is integrated into the <em>locus</em>/<em>loci</em> of interest by homologous recombination. A cassette may contain a DNA segment called 'negative marker' which prevents growth under particular conditions, while a positive marker permits growth under certain conditions. In consequence, a second marker consisting of a drug cassette may be used as a negative marker in order to evidence its insertion by inducing cell death when they are plated in selective conditions.
Answer:
A. Photosynthesis
Explanation:
Plants convert carbon dioxide, water and minerals into food using the sun's energy in a process known as photosynthesis
Only so many can fit in the area meaning the vain ,artery or somthing else
Answer: NATURAL SELECTION is the term used to describe the greater relative survival and reproduction of individuals in a population that leads to evolutionary change.
Explanation: Those individuals with characteristics (either physical or behavioral) that give them an advantage in a particular environment, are more likely to thrive and survive to breed, passing along their characteristics. Likewise, those who are disadvantaged are less likely to survive to breed and pass along their traits.