Explanation:
In the given problem, Farah is doing an experiment that involves calculating the speed of a longitudinal wave
For example, Sound wave is a longitudinal wave. It travels faster in solid than liquid and gas as the solid is more denser.
The speed of the sound increases with the temperature. At higher temperature, the molecules have more kinetic energy. They can vibrate faster. The sound wave can travel faster. The speed of the sound in the room temperature is 346 m/s.
If Farah increases the temperature then the sound wave travels faster.
B. because they can be used to transform bacteria
C. because it is difficult to insert new genes into them
D. because they cannot be cut with restriction enzymes
Answer:
Option (B).
Explanation:
Plamids are the extra chromsomal circular DNA present in the bacterias. Plasmid DNA can undergo replication independently to the chromsomal DNA.
Plamids can be used to transform bacteria and used in the molecular techniques. The foreign gene can easily be inserted into the plasmid DNA and used in the formation of recombinant protein.
Thus, the correct answer is option (B).
B) Being around humans represented an advantage, so wolves were able to take advantage of that by changing their digestion to be able to eat wheat, rice, barley, corn, and potatoes.
C) Dogs mutated to be able to eat wheat, rice, barley, corn, and potatoes.
D) Some wolves may have had variants in their digestion that allowed them to eat wheat, rice, barley, corn, and potatoes and so were able to survive with humans.
Answer:
The correct answer will be option-D
Explanation:
The studies done by the scientist led to the conclusion that the doges were evolved from the wolves,
The interaction of the wolves with humans became symbiotic around 10000-15000 years ago when the wolves in search of food changed themselves and adapted to survive with humans.
The studies on the genes of Dog shows that the gene responsible to digest carbohydrate called amylase starting duplicating in Wolves allowing them to digest carbohydrate cereals offered by humans. Their pancreatic enzymes also got modified to digest the carbohydrate-protein rich cereals.
Thus, option-D is the correct answer.
Answer:
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b. In this stage, the sister chromatids pull apart and migrate toward opposite ends of the cell.
c. In this stage, the pairs of sister chromatids attach to the spindle fiber.
d. In this stage, the membrane breaks down, freeing the chromosomes.