Out of the given changes, developing hands is the first change to take place in a child.
This change occurs in the fifth week of life. By six and a half weeks, the embryo begins to move its hands and they undergo the most dramatic change between the sixth and seven week. The digits have formed by the seventh weeks and they are individual and fully separated by seven and a half weeks.
Answer:
Cancer cells such as Hela cells escape to normal cell cycle by mutations that lead to the misexpression and/or overexpression of regulatory molecules (e.g., cyclins and cyclin-dependent kinases) and faulty checkpoint control of the cell cycle
Explanation:
The term cell cycle refers to the mechanism of DNA replication and cell division, which involves a series of sequential steps. The control of the cell cycle depends on 1-cyclins and cyclin-dependent kinases (CDKs) that regulate the cell cycle by a cascade of protein phosphorylations and 2- a group of checkpoint controls that monitor the completion of critical cellular events. HeLa is an immortalized cell line derived from cervical cancer cells. These cells (HeLa) contain 76 to 80 total chromosomes (instead of the 46 chromosomes that contain normal-diploid body cells), some of which are heavily mutated. These mutations can affect CDKs that control the cell cycle as well as checkpoint-control mechanisms (for example, those resulting from DNA damage), thereby cells do not enter programmed cell death (apoptosis) and proliferate uncontrollably.
The opening to the windpipe is known as the glottis
Your answer is D: Glottis
~Hope this helps
Answer: Option C
Explanation:
Arteries have a great deal as it has more smooth muscles in their walls as compared to veins the wall is thick.
The blood in the arteries flows with effect of pressure and the thick walls helps in blood flow. The arteries need to constrict and relax which allows the movement of blood from heart to various parts of the body.
In veins there are no smooth muscle cells because there is no requirement of pressure when the blood moves from the various parts of the body to heart.
Fossil fuels and dissolved carbon compounds in the oceans