Answer:
(D). RNAi allows scientists to turn off one gene specifically to study its effect.
Explanation:
RNAi (RNA interference) can be defined as a process, which involves inhibition of gene expression by degrading the targeted mRNA molecules. This technique is widely used in laboratories to study the functions of different genes by targeting them.
For this, a dsRNA molecule is formed having a sequence complementary to target gene and introduced into the cell or organism. This RNA is recognized as exogenous RNA and triggers activation of RNAi pathway.
RNAi pathway leads to a significant decrease in expression of a target gene. Hence, physiological role of the targeted gene product can be check by studying the effect of decrease in its expression.
Thus, the correct answer is option (D).
Answer:
The Answer is option D
Explanation:
There are two major types of reproduction in living organisms, these are sexual and asexual reproduction. Asexual reproduction is a type of reproduction in which an offspring is derived from a single parent. The offspring derived from the parent inherit DNA molecule from its parent, thus, the genetic information in both the parent and the offspring are identical. Thus, in asexual reproduction, the parent and the offspring possess identical genetic make up.
B. Eggs
C. Sperm
D. Ovum
Answer:
C
Explanation:
The flagella of the sperm are used to help it swim through the vagina and uterus so it reaches the fallopian tubes from where it will meet the egg and fertilize. The ATPs are found in the many mitochondria organelles in the sperm are used to generate the required energy to swim and breach the walls of the egg during fertilization.
Answer:C sperm
Explanation:
O B. DNA polymerase
O C. Gel electrophoresis
O D. Restriction endonuclease
Answer: B DNA polymerase
Explanation: (i think)
Spontaneous generation is a concept of the origin of life that can be traced back to the theories of Greek philosophers Aristotle and Plato and persisted through the Enlightenment Period. While some Enlightenment Period scientists experimented to show that life could arise even under controlled conditions, their methods were not sanitary and microbial contamination of the containers used gave dubious results. it was Louis Pasteur who is generally credited with refuting the idea due to his more advanced and precise control of starting conditions that revealed that no life arose from non-life. This strongly established that life cannot arise from non-life.
Today, we have similar superstition by some naturalists who posit that natural processes are capable of producing living entities, whether it is SETI searching for extraterrestrials, NASA astrobiologists searching for aliens and panspermia, or other life enthusiasts similarly inclined.
Currently, the term abiogenesis is used by naturalists to detail the emergence of life from non-life,and has failed miserably to do so. It is very similar to the spontaneous generation idea that was disproven and lost favor in the 1800's. The current understanding strongly favors abiogenesis because it ideologically fits the belief system that all reality is the result of natural processes and forces, but there is not evidence of its validity, not even at the simplest biochemical levels.