Answer:
Vitamin D3 is synthesized in keratinocytes of the two epidarmal layers namely <u>stratum basale </u>(bottom layer) and <u>stratum spinosum</u>.
Explanation:
In the two epidermal layers of the skin namely <u>stratum basale</u> and <u>stratum spinosum</u>, 7-dehydrocholesterol (pro-vitamin D3) is converted to vitamin D3. This process takes place in the presence of ultravoilet radiations. Briefly, upon exposure, the pro-vitamin D3 is photolyzed to pre-vitamin D3. The pre-vitamin D3 then isomerized to form vitamin D3.
Less water-soluble substances will reach the deeper part of respiratory system. That means a substance which more water-soluble(ammonia, formaldehyde, hydrogen chloride) will only damage upper respiratory systems like trachea or bronchus.
High water soluble substance also more irritating.
Answer:
A sexual reproduction occurs when a male, and a female collide together and make a baby. asexual reproduction occurs only when by cell division during mitosis to produce two or more genetically identical offspring.
Fun fact: Sexual reproduction also occurs when haploid gametes appear.
Haploid describes a cell that contains a single set of chromosomes.
Gametes contain half the chromosomes contained in normal diploid cells of the body
Explanation:
Answer:
Membrane Lipid Rafts.
Explanation:
They are present in all cells and have been implicated in a variety of sorting and signaling processes. They are rich in cholesterol, sphingomyelin, and glycosylphosphatidylinositol (GPI)-anchored proteins; have more ordered acyl side chains; and are thicker than nonraft bilayer domains.
I believe the answer is yes