Answer:
The correct answer is option B. "II and III".
Explanation:
In order to prove that ActA protein of Listeria is necessary and sufficient for bacterial movement within its host cell a series of results in transformed Listeria and transformed E. Coli must be obtained. First, if Listeria lacking the ActA gene fail to move inside the host cell cytosol it will prove that ActA is necessary for bacterial movement. Second, a transformed E. Coli that expresses ActA should be able to move in host cell cytosol. Wild type E. Coli does not expresses ActA, if ActA alone makes E. Coli able to move in host cell cytosol it will prove that ActA is sufficient for bacterial movement.
Answer:
A) hybridization; morphospecies
Explanation:
The biological species concept is the concept which can define a species as an individual of a large population which can interbreed and produce an offspring in a population. The concept was given by Ernst Mayr.
Morphospecies refers to the species which can be characterised by the differences in their morphological features like in the Oak, willows and the dandelions.
The biological species concept is not valid or complicated in the case of the morphospecies like in the Oak, willows and the dandelions as the individuals of these three population can exchange their genes through the process of hybridization.
Thus, Option-A is the correct answer.
Answer:
The answer is D. chemotaxis
Explanation:
A bacterial cell is in a solution with a chemical gradient. The bacterial cell directs its movements in order to move toward the highest concentration of glucose molecules within the solution. This is an example of positive chemotaxis
Answer:
Deforestation for the sake of house and malls should be reduced to control this disaster.
Explanation:
Answer:
Option A and Option B
Explanation:
A transcription bubble is defined as a molecular structure which is formed when only a few or very limited section of the DNA strand has unwind-ed.
These transcription bubbles are small in size and in general their size ranges between 12-14 base pairs
An RNA polymerase which is about 9 nt long is responsible for making the DNA sequence ready for producing transcript at the 5' end (a complementary, antiparallel RNA strand )
Rate at which double stranded DNA molecule slide back and forth for transcription ranges with in 40-50 nt/sec
Hence, both option A and B are correct
