Answer:
Perhaps the most amazing thing about mitosis is its precision, a feature that has intrigued biologists since Walther Flemming first described chromosomes in the late 1800s (Paweletz, 2001). Although Flemming was able to correctly deduce the sequence of events in mitosis, this sequence could not be experimentally verified for several decades, until advances in light microscopy made it possible to observe chromosome movements in living cells. Researchers now know that mitosis is a highly regulated process involving hundreds of different cellular proteins. The dynamic nature of mitosis is best appreciated when this process is viewed in living cells.
Explanation:
I think the correct answer from the choices listed above is option B. Vector is the tool that is used to transfer a gene into an animal. The vector is a piece of DNA that is used to carry the specific segment of DNA you want transferred into the organism. Hope this answers the question.
Answer:
The oxygen is available in a right amount.
Explanation:
The oxygen is available in a right amount because her body were functioning correctly and we know that our body functioning correctly if it gets oxygen in a right amount otherwise body will not perform correctly its functions. The tiredness Elisa feels is due to her routine work which can be eliminated by doing rest for sometime so after resting sometime she feel better and active.
In a controlled experiment, the control group is compared with an experimental group.
Explanation:
A set of variables or data is considered as the control group that remains fixed or constant in its normal usual state; while all the other variables or data are identical with this control group, except one independent variable at a time. This is to observe the changes when that one variable is allowed for variations at a time.
This independent variable which undergoes changes is in the experiment group while the remaining constant group is the control group. The dependent variable changes with changes in the independent variable.
By comparing the control group against the experimental group, uncertainty in results are avoided.