Answer:
B. The smaller DNA pieces travel farthest towards the positive end of the box
Explanation:
Gel-electrophoresis technique is a technique which is used to separate the fragments of DNA based on their size. The technique is employed in the DNA fingerprint analysis.
The DNA samples are loaded on one side of the gel and when an electric current is applied, the DNA moves from the wells towards the electrodes.
The DNA is a negatively charged molecule which travels through pores in the gel and reaches towards the electrode with positive charge.
The smaller the size of the DNA fragment, the faster it moves.
Thus, Option-B is correct.
He used the compound microscope!
Gold's natural state is solid. Gold is a soft, heavy, yellow elemental metal that has a great value. Gold has a fixed shape and volume and its natural state is solid.
Anton van Leeuwenhoek :-))
Answer:
Fossil record
Explanation:
Fossil record provides historical data documented by fossils, remains of organisms from earlier geological period that have been kept or preserved in rooks.
Morphology is the study of the shape or structure of a thing.
Radiometric data is the use of gamma rays to date rocks or carbon.
From the definitions above, only fossil records can be used to calibrate the clock, by providing information about lineage divergence, from fossils.
