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Full Question:</u>
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Trypsinogen is split by the enzyme enterokinase to form an activated molecule of the protease trypsin. Which of the following would confirm that the activation of trypsin is an example of how a positive feedback mechanism can amplify a biological process?
A. The activated trypsin enzyme can use enterokinase as a substrate
B. The trypsin produced by the reaction is capable of splitting and activating additional trypsinogen molecules
C. If levels of trypsin were to get too high, the trypsin molecules would inhibit the enzyme enterokinase
D. Each mRNA molecule that codes for trypsinogen can be translated repeatedly to form many peptide molecules
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Answer:</u></h3>
Trypsinogen molecules are first split into the active enzyme Trypsin by enterokinase. Then the Trypsin being a protease itself, works on Trypsinogens and converts them to Trypsin. Thus this is a positive feedback.
Option B
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Explanation:</u></h3>
Trypsinogen is a proenzyme which is secreted by pancreas into the duodenum. Enterokinase is a intestinal enzyme that is secreted from the small intestinal glands. Enterokinase works on the Trypsinogens to convert them into trypsin by splitting a peptide chain from the proenzyme. This trypsin then digests a variety of proteins and peptides from diet.
Trypsin is a protease and the proenzyme Trypsinogen is a protein. So trypsin works on the secreted trypsinogens too and amplify the production of trypsin from the trypsinogens to enhance the digestion process. Thus, a positive feedback chain is seen here.
Answer:
Mitochondrial DNA accumulates DNA mutations quickly. Because of this, it would be most beneficial in analyzing the ancestral relationship of organisms that are
A. Mitochondrial DNA is beneficial in both of these cases
B. Distantly related
C. Mitochondrial DNA is not used to analyze relationships
D. Closely related
Explanation:
Mitochondrial DNA <em>does not serve to identify individuals without ambiguity</em>, but to detect kinships between groups of individuals; it is then used for comparisons between missing persons and unidentified remains and their relatives.
<u><em>The answer is</em></u>: <u>D. closely related.</u>
I think it is the 1st & last answer. When you get a job, or most jobs, they require to to work cooperatively. 2 heads are better than one in trying to find a solution to a problem. Some people are better suited to have jobs that required not as much teamwork, but you have to get the job first.
Answer:
20 chromosomes
Explanation:
Mitosis is a kind of cell division that results in daughter cells with same number of chromosomes as the parent cell. It involves stages including Prophase, Metaphase, Anaphase and Telophase. In prophase, the Chromatin condenses into Chromosomes.
In Anaphase stage, the 10 chromosomes as mentioned in the question divides into opposite poles of the cell. One individual chromosome contains two sister chromatids, which actually separates in the Anaphase stage. Hence, at the end of the Anaphase stage, there will be 10 chromatids each at opposite poles of the cell. Each chromatid at this stage is considered a chromosome.
Hence, a cell with 10 chromosomes will contain 20 chromosomes (10+10 chromatids on each pole) in the Anaphase stage just before the cell divides into two in a process called CYTOKINESIS.
The answer is <span>25% red : 50% pink : 25% white
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A - allele for red flowers
a - allele for white flowers
AA - flowers with red flowers
Aa - flowers with pink flowers
aa - flowers with white flowers
The cross looks like:
Parents: Aa x Aa
Offspring: AA Aa Aa aa
Red flowers (AA): 1/4 = 0.25 = 25%
Pink flowers (Aa): 2/4 = 0.50 = 50%
White flowers (a): 1/4 = 0.25 = 25%
