Answer:
I do not know if this is correct, but I think it is a meteor
Explanation:
Answer:
All of these choices are correct.
Explanation:
Cell cycle is the process of growth and division of cell. It comprises of interphase and mitosis. In interphase the cell grows, replicates its genomic content and prepares itself for division. In mitosis the division occurs.
Cell cycle is controlled by a group of kinases called as Cyclin dependent Kinases (CDKs). They act by phosphorylating their substrates. They are of various types like Cdk1, Cdk2, Cdk4 etc. They become active when they bind to a regulatory protein called cyclin. They are also of various types like Cyclin A, Cyclin B, Cyclin C etc. Level of cyclin and corresponding CDK increases and decreases according to the stage of cell cycle. For example in S phase of cell cycle concentration of cyclin A and E shoots up. CDK2 is able to bind to these cyclin molecules and hence it becomes active.
Cell cycle has major checkpoints where the condition of cell is analysed before it proceeds to the next stage of cycle. If any abnormality is detected, repair mechanism is activated or the cell is killed. Checkpoints do not allow cell cycle to proceed in damaged cells.
p53 is a tumor suppressor protein which can halt cell cycle when it detects some abnormality in cell. It usually acts in G1/S checkpoint (before the DNA replication starts in cell) and G2/M checkpoint (before the cell division begins). Hence, all of the above statements are true.
Positive: You get to see different animals, see all kinds of habitats, learn new facts about all the animals and see them maybe in action!
Negative: They might be sleeping, In a cage or fence so they can't get out, restricted.
Both glucose and amino acids are needed inside the cells, but these molecules are too big to pass through the cell membrane on their own. Therefore, they need the help of the transport proteins which are located on the membrane of the cells. The transport proteins help both glucose and amino acid to enter the cells through facilitated diffusion.
Answer:subarachnoid space.
Explanation:Explanation: the cerebrospinal fluid is produced by the ventricles of the brain.it is the circulating fluids that surrounded the brain and the spinal cord.
These fluid supplies the brain and spinal cord with nutrients,removes wastes and protects spinal from trauma.
The lumps puncture is usually done to :
To determine any infection in theCNS (infalamtion of the brain amd spinal cord(meningitis).
To determine if there is bleeding in the CNS.
To Diagnose brain tumor or viral infection.
