Blood coagulation is initiated by either the intrinsic or extrinsic pathway. the final step in both pathways would be:

1 answer:

3 0

The answer that best completes the statement above is this: Activation of factor X, leading to conversion of prothrombin II to thrombin IIa. This is the final step in both pathways. The thrombin, which is an enzyme in the blood plasma, does the conversion of fibrinogen (I) to fibrin (Ia). This is the one responsible in clotting. The intrinsic pathway is initiated by Factor XII. On the other hand, tissue factor during injury initiates the extrinsic pathway.

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A substance that produces insensitivity or stupor is called a

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Narcotic ............

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Many different types of mutations can occur within the body. An individual experiences a mutation that changes a base

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Answer:

The type of mutation responsible for changing a base in the mRNA strand, without changing the coding aminoacid or protein, is called a silent mutation.

Explanation:

In a silent mutation occurs the change of a nitrogenous base in one of the codons that encodes an aminoacid, without changing the aminoacid or altering the structure or function of the protein to be synthesized.

In this type of mutations the change of the base does not mean the change of the aminoacid, because some aminoacids can be coded with more than one codon. In the case of Leucine, the codons that encode it are CUU, CUC, CUG or CUA, so even if a base changes, the final protein will be the correct one.

For the other options:

Missense: the change of the base in the DNA chain implies the change of the codon in the mRNA and of the encoded aminoacid, in that way a structural and functional alteration of the synthesized protein occurs.

Nonsense: the change in the nitrogenous base in the DNA leads to the coding of a termination codon, so that the protein is ultimately incomplete.
Insertion: in this case there is the addition of more nitrogenous bases to the DNA chain, with respect to the original one.

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What type of cell organelle is only found in animal cells? (1 point)

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Answer:

lysosomes

Explanation:

Animal cells each have a centrosome and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, whereas animal cells do not.

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What has the base Thymine?

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Video: DNA: Adenine, Guanine, Cytosine, Thymine & Complementary Base Pairing. Learn the language of nucleotides as we look at the nitrogenous bases adenine, guanine, cytosine and thymine.

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Which of the following terms describes the movement of water from the surface to the atmosphere?

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Answer:

The answer is evaporation.

Explanation:

Runoff is not right because runoff is water that hits the surface of the earth, then runs down into natural bodies of water. It is not condensation either. That is because condensation is when cool water vapor comes into contact with humid, warm air causes water droplets to appear on the surface of what is containing the cool water vapor. Finally, precipitation is when water comes down from the atmosphere to the surface of the earth, therefore this is incorrect. Evaporation however is when water from the surface of the earth turns into water vapor and goes into the atmosphere. Therefore it is the right answer.

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