Answer:
If that were true, then the first thing that would happen when the sun disappeared is that Earth, along with all the other planets, would go flying off into space. It would be complete and utter chaos in our solar system. ... Therefore, we would still see the sun in our sky eight minutes after it was gone.
Hope this helps! :) )
Answer:
the 4th one The lumen, is my guess
Answer:
Isotopes
Explanation:
If two atoms have different numbers of protons, they are different elements. However, if two atoms have the same number of protons, but different numbers of neutrons we refer to them as isotopes. Two terms we use to identify nuclides (isotopes) are atomic number and mass number.
A a short strand of RNA that can complement and inactivate a sequence of mRNA
Answer: Option A
<u>Explanation:</u>
siRNA stands for small interfering RNA which has a set double-stranded RNA molecule. It is also called as silencing RNA or short interfering RNA. mRNA is a messenger molecule in the siRNA.
siRNA integrates into a protein complex known as RISC that tells the siRNA to target the RNA sequence. Then its double strands unwind into a short strand in that protein complex and remain bound to it.
It then directed by the RISC either to complement ( enhance) the mRNA molecule sequence or to degrade (inactivate) the mRNA molecule sequence.
<h2>Clotting factors </h2>
Explanation:
Clot enhancers: calcium ions, fibrinogen, thrombin, vitamin K, PF3, tissue factor
- Calcium ions are required for the fibrin clot formation,also helps in the activation of thrombin from prothrombin
- Fibrinogen is the substrate of thrombin and helps in the formation of a normal blood clot at the site of vascular disruption
- Thrombin converts fibrinogen into fibrin which leads to the formation of a fibrin clot;also causes platelet aggregation
- Vitamin K is the fat soluble vitamin which act as coenzyme,the aromatic ring of Vitamin K undergoes in sequential oxidation and reduction during the formation of active prothrombin
- PF3 comes into action whenever there is platelet activation,it is released and participates in thrombin formation
- Tissue factor helps in the initiation of blood coagulation
Clot inhibitors: heparin, coumadin, aspirin
- Heparin is an anticoagulant which prevents the formation of blood clot,used before surgeries to minimize the risk of blood clots
- Coumadin is also known as Warfarin which is a synthetic compound that inhibits the formation of active prothrombin and cause death of organisms due to constitutive bleeding
- Aspirin is a blood clot inhibitor and helps in preventing cardiovascular events in high risk patients
Serum is called blood plasma without fibrinogens and does not play any role in blood clotting(neither as an enhancer nor as an inhibitor)