Answer:
C. 275 nm
Explanation:
At 275 nm of ultraviolet wavelengths causes mutation in a skin cell because at 275 nm of wavelength, maximum DNA Copying Errors occur in the cells that leads to mutation in the cell. A mutation is a kind of change that occurs in the DNA, due to two reasons, due to mistakes that is occur when the DNA is copied or as the result of environmental factors such as ultraviolet radiations.
<span>Taking lipid lowering drug as perscribed is the focus. Hypercholesterlmia is a condition where LDL is greater in the blood. So the level of such lipids should be lowered. Inactivity, obesity and unhealthy diet are causes. So the treatement should involve avoiding the situations leading to high LDL.</span>
<h2>d) option is correct </h2>
Explanation:
The unfertilized egg contains various organelles and a liquid solution that fills the cell which is called the cytoplasm
Within that cytoplasm are various molecules containing genetic information or chemicals to spark various reactions, called cytoplasmic determinants
Some are different kinds of proteins, most are molecules of RNA and these determinants are unevenly distributed across the egg and then, once it's fertilized, the zygote
Once this zygote undergoes cleavage division, all of these random determinants that were in the same cell are suddenly in different blastomere cells, which means that these blastomeres each contain a different assortment of molecules
A terrestrial ecosystem is a land-based community of organisms.
Answer:
1 . The stage on the first meiotic division when the homologous chromosomes move to opposite poles but the sister chromatids remain together
: b. Anaphase I
2 . The stage in the second meiotic division where sister chromatids migrate to opposite poles
: c. Anaphase II
3 . A structure on the chromosome that holds a pair of chromatids together during replication
: f. centromere
4 . A double-stranded chromosome following replication attached by a centromere
: d. chromatid
5 . A condition where non-sister chromatid of homologous chromosomes exchange genes
: e. crossing over
6 . The stage in the first meiotic division where the homologous chromosomes line up as a pair
: a. Metaphase I
7 . The stage in the second meiotic division where the chromatid pair lines up at the equator of the cell: g. Metaphase II
Explanation:
DNA replication occurs during the S phase of the interphase of the cell cycle. The replicated DNA molecules are accommodated in two sister chromatids of a chromosome that are held together by a centromere.
During prophase I, the chromatids of a homologous chromosome pair exchange a genetic segment. This process is called crossing over. It generates recombinant chromatids with new combinations of genes.
Metaphase I of meiosis I includes the alignment of homologous pairs of chromosomes at the cell's equator. This is followed by separation and movement of homologous chromosomes to the opposite poles of the cell during anaphase I.
Metaphase II of meiosis II includes the alignment of individual chromosomes, each with two sister chromatids, on the cell's equator. During anaphase II, splitting centromere separates the sister chromatids which then move to the opposite poles of the cell.