Answer:
True
Explanation:
The epidermis is the outermost layer of the skin, being formed by epithelial tissue. The epidermis is made up of five layers: Stratum corneum, lucid stratum, granular stratum, spinous stratum and stratum basale.
Each layer has specific functions and characteristics:
- Stratum corneum: This is the outermost layer of the epidermis, being formed by dead cells, without nuclei and flattened. The cells have a large amount of keratin and are continually flaking.
- Lucid stratum: Commonly more evident in thick skin (palms and soles), but in regions of the body where the skin is very thin it is not possible to notice its presence. It consists of a layer of flat, eosinophilic and translucent cells.
- Granular stratum: Consists of 3 to 5 layers of flattened polygonal cells with central nucleus and accumulated cytoplasm of basophil granules (keratin-hyaline granules), which will give rise to keratin.
- Spinous stratum: Consists of 5 to 10 layers of flattened cuboid cells with a central nucleus. The cells of this stratum have cytoplasmic projections with keratin filaments, which hold the cells together due to the presence of desmosomes. This whole arrangement gives a "Thorn" aspect to this stratum.
- Stratum basale: This is the <u>germ</u> <u>layer</u>, the deepest layer of the epidermis and in contact with the dermis. This layer is responsible for epidermal renewal, presenting intense mitotic activity. The produced keratinocytes are constantly pushed to the upper layers and increase their keratin production. It takes up to 26 days for a basal cell to reach the stratum corneum, at which point it matures.
Answer:
Since the gene that transmits hemophilia is linked to the X chromosome (
), for a couple to have a hemophiliac daughter, the father must present the disease and the mother must be a carrier. Therefore, the parents' genotypes are 
and 
, while the daughter and son genotypes are 
and XY, respectively
Explanation:
An X-linked recessive gene -as in the case of hemophilia- will only be expressed in males with the affected X chromosome or in females who are homozygous for that gene.
- A healthy man and a carrier woman can have healthy, hemophilic sons, while half of the daughters could be carriers.
- A haemophiliac man and a healthy woman could have healthy sons and carrier daughters.
- <em>A haemophiliac man and a carrier woman (as in the case above) can have healthy sons, while daughters can be carriers or haemophilics.</em>
The cross between the hemophilic father and the carrier mother can be seen in the following diagram:
Alleles Y
Y
X X XY
Where the possibility of having a healthy son and at least one daughter with hemophilia is evident.
Learn more:
Sex linked inheritance brainly.com/question/11839068
Enzymes latch on and lock together and enzymes have a higher activation energy in comparison to catalysts eg: amylase in saliva helps break down the large molecules in food and releases glucoses from starch
Answer:
Plants harvest energy from the sun with the help of chlorophyll and carotenoid, two photon-capturing molecules. But if the plants are exposed to too much sun, these molecules absorb more energy than they can handle and generate reactive species of oxygen that can destroy the plant.
