Answer:
The correct answer is option D.
Explanation:
In the given case, a similar amount of colonies is witnessed in both control as well as the test plate. This concludes that it does not influence the organism, thus, there was no enhancement in the rate of reversion, that is, the number of colonies in the test plate does not get decrease. Thus, the compound in the disc is not mutagenic as there was no increase in the reversion rate.
Solution:
A train travels at 69 kilometers in 1 hours and then travels 98 kilometers in 5 hours.
(i)Total distance traveled = 69 + 98
= 167 kilometers
(ii) Total time taken to cover total distance = 5 + 1
= 6 hours
(iii) Average speed = total distance traveled divided by total time taken
= 167/ 6 = 27.83 kilometers per hour
An organism incapable of producing its own energy, and so must gain this energy from other organisms.
Answer:
The correct answer will be option-C
Explanation:
Replication is a complex process which makes copies or replicates the DNA in every organism present on the Earth. Replication is an ATP dependent process which is catalysed by several enzymes including DNA helicase, polymerase, primase.
During replication, the two strands are synthesized from parent strand in which the strand which is synthesized in 5' to 3' direction is known as the leading strand which is continuous whereas another strand synthesized in 3' to 5' direction is known as lagging strand as it is produced in the lags.
Since in the leading strand DNA polymerase adds nucleotides at 3' end, therefore, it requires only one RNA primer which assists DNA polymerase to proceed the reaction whereas in the lagging strand since the strands are synthesized in the lags so possess many RNA primers so that DNA polymerase can bind.
Thus, option-C is the correct answer.
Answer: B. evaporation, condensation, precipitation
Explanation:
The cycle that ensures that fresh water is available is called the Hydrological cycle and it involves several key processes.
As it is a cycle, none of the processes can be considered first but if any could, it would be evaporation. This is when water on the surface is heated and becomes water vapor (gas) and rises towards the atmosphere.
Condensation occurs as the water vapor rises because the further up you go, the colder it gets. These water vapor particles will thus condense and clump together to form clouds.
These clouds keep getting larger until they are too heavy to be carried by the atmosphere in which case they fall to the ground as rain the process known as precipitation.
