Sunscreens contain chemical ingredients in their compositions, such as avobenzone, oxybenzone, octocrylene, homosalate, octisalate and octinoxate, which have been linked to health problems such as hormonal disruptions, cancer, as well as liver and kidney changes.
<h3>What is oxybenzone, octocrylene, and homosalate bad for?</h3>
Oxybenzone, octocrylene, and homosalateto protect from UVA also penetrates deep into the skin. The penetration into the human body can cause several problems in human health such as
- allergic reactions
- cell mutation
- deregulation of hormonal processes,
- etc.
With this information, we can conclude that Oxybenzone, octocrylene, and homosalateto is considered a hazardous eye irritant and, as an allergen, is also known to cause skin allergies.
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Answer:
The fish in India provides protein and has a huge source of vitamin A, B, and D. There are about 30,000 species of fist in the world out of which about 18000 are found in India. Fish also forms an important part of diet of the people living in the coastal areas of Kerala, West Bengal, Andhra Pradesh, Tamil Nadu, Maharashtra, Karnataka, Goa, and Gujarat. Fish attracts many people in India because it is cheap in cost and highly nutritious.
Answer:
Three theoretical models for the replication of DNA had been proposed in the past. Out of these, the method of semi-conservative replication is most widely accepted.
Conservative replication: In this method, no DNA unwinding takes place. The parent DNA gives rise to daughter DNA.
Dispersive Method: In this method, the chains in the DNA molecule break and recombination occurs randomly. The daughter and parent strands will have segments of recombinant DNA.
Semi- conservative: In this method, the two strands of the double helix unwind. Each strand acts as a template for the synthesis of a new strand.
DNA replication is more complex in eukaryotes as compared to prokaryotes. Prokaryotes have a single point of origin from where the replication begins. Eukaryotes have multiple points of origin. Eukaryotic cells have a unidirectional method of replication whereas prokaryotes do not. Prokaryotes just have two polymerases whereas eukaryotes have more than four. The replication rate is faster in prokaryotes.
Answer: Yes, it is possible that this student's parents are both the true biological parents.
Their genotype must be heterozygous for the blood type A (AO).
Explanation: Each blood type is controlled by two alleles. A and B are dominant while O is recessive. For two parents that have blood type A to have a child with a blood type O, the both of them are heterozygous for blood type A, this means that each of them has one A dominant allele and one O recessive allele. Their genotype can be represented as AO. The child with blood type O is inherited one O recessive allele from each parent, that is she is homozygous for the blood type O. AO x AO = AA, AO, AO and OO.
AA and AO will manifest as blood type A while OO will manifest as blood type O.
See the attached punnet square for more information.
Answer:
During metaphase 1, the chromosomes line up in the middle of the cell. The way the chromosomes line up is random, or independent. This independent alignment results in different possible arrangements or assortments of chromosomes during metaphase. This in turn results in different sets of chromosomes in daughter cells. During sexual reproduction, the traits that are determined by the genes on these chromosomes are passed on from parents to offspring.
Explanation:
In metaphase, the typical chromosome is formed by two chromatids joined by a centromere. Each chromatid is composed of a sequence of chromatin ringlets domains. During metaphase I, fibers of the spindle apparatus capture chromosomes and take them toward the center of the cell, to the metaphase plate. Each chromosome of the pair joins with a microtubule of only one of the spindle poles, so the two equivalent chromosomes join the fibers of opposites poles.
The homologous pairs of chromosomes get aligned in the metaphase plate for their posterior separation in anaphase I. When they align in the center of the cell, their orientation is random.
