S Phase it is important that the cell develops properly
To determine visually the pH(acidity of basicity) of the solution.
Answer:
Option C, 
Explanation:
The diploid number of chromosomes are represented as 
.
Here the somatic chromosome number is 
which can be represented in the "" format with N being equal to 
.
Now, as we know that the total number of chromosomal combination with chromosome number being
is equal to
Substituting the given values in above equation, we get -
Therefore, total of different combinations of centro-meres could be produced during meiosis.
Hence, option C is correct
Answer:
63.55 amu
Explanation:
The average atomic mass of an element can be calculated by multiplying the decimal abundance of each isotope of that element by the relative atomic mass and summing them up. That is;
Average atomic mass = {atomic mass of isotope 1 × decimal abundance of Isotope 1} + {atomic mass of isotope 2 × decimal abundance of isotope 2}
According to this question, two most abundant isotopes of copper contain 34 and 36 neutrons. The atomic mass of each isotope can be found by adding the no. of neutrons to the atomic number/proton no., which is 29.
Atomic mass of Isotope 1= 34 + 29 = 63
Atomic mass of Isotope 2= 36 + 29 =65
Decimal abundance of each isotope = percentage abundance ÷ 100
Isotope 1 (with 34 neutrons) = 72.5% = 72.5/100 = 0.725
Isotope 2 (with 36 neutrons) = 100 - 72.5 = 27.5% = 27.5/100 = 0.275
Therefore, the average atomic mass
= {63 × 0.725} + {65 × 0.275}
= {45.675} + {17.875}
= 63.55
Hence, the average atomic mass of copper is 63.55 amu
Repetition best describes what took place during the class.
Explanation:
In experimental work normally repetition carried on repeatedly so that student can achieve more perfection on their assignments. Here Mr. Grayson demonstrated an experiment at beginning of class. Then in the experiment pair wise students collected data to maintain accuracy and repeat the same for recapitulation.
Repetition is the process used to follow to cope up with the new experiments. Experiment needs to be done again and again in repetition to be verified and to draw a final conclusion. In a scientific study practice gives more accuracy and perfection.
