Answer:
The correct answer is option B.
Explanation:
On seeing the question, it is clear that it is based upon the concept of semi-conservative theory for the replication of DNA. It is mentioned that when the bacteria were grown on N-15, the mass was 55 fg. Now, after two generations, the DNA would comprise N-14 and the mass of them will be 5.4 fg.
The average mass would be = 5.4 + 5.5 / 2 = 10.9 / 2 = 5.45 fg. The mass of the bacteria isolated from the culture would possibly contain both the masses. That is, the mass of DNA with N-14 only would be 5.4 fg, and the mass of DNA with both N-15 and N-14 would be the average, that is, 5.45 fg.
Protostar
Then main phase so there are two possibilities:
1. Average size star (size of the sun)
Undergoes main phase, then becomes a red giant, then planetary nebula, then white dwarf.
2. Massive star
Undergoes main phase, then red supergiant, then supernova (star implodes) then the star becomes a neutron star OR if it was REALLY big a black hole.
Answer:
But certain stressors, most of them human-caused or human-influenced, threaten or reduce biodiversity. Because the creatures and plants in ecosystems are interdependent, the loss of even one species can have profound effects on the entire ecosystem, can affect other ecosystems and can endanger people as well.
Answer:
The box will not move because balanced forces are acting on it.
Explanation:
According to Newton's first law of motion, an object will remain in its state of rest or motion along a straight line unless acted upon by an unbalanced force.
An unbalanced force is an individual force acting on any side of an object which is not balanced by a force of equal magnitude acting in the opposite direction.
From the image, two forces of equal magnitude of 10 N are pulling the 100 kg box in opposite directions. Since the two forces, 10 N each are pulling the object in opposite directions, they are balanced forces. Therefore, the box will not move because balanced forces are acting on it.
Answer:
All viruses are obligate parasites; that is, they lack metabolic machinery of their own to generate energy or to synthesize proteins, so they depend on host cells to carry out these vital functions.
