Daily NEET MCQ- February 25, 2022 - NEET MCQ

Mitochondria are present in the middle piece of the sperm. They are essential for producing energy required for movement of tail. This is essential for movement through the genital tract and oviduct before sperm encounters the egg. Rakesh might have less or poorly functional mitochondria, which prevent his normal count of sperms from moving along the genital tract.

Hence, the correct option is (D).

Release of Prolactin is not an important component of initiation of parturition in humans.

• At the end of gestation, the completely developed foetus is expelled out. This process is called parturition. 
• Parturition is controlled by a complex neuroendocrine mechanism.
• Estrogen and progesterone ratio increases as estrogen levels rise significantly. 
• Prostaglandins, which stimulate uterine contractions are also produced that act on myometrium. 
• Oxytocin, the main hormone, also called as birth hormone is released by maternal pituitary, which brings about strong uterine contractions. 
• Prolactin is a lactation hormone that has no role in initiation of parturition.

Hence, the correct option is (A).

The lower set of locants is 1, 3 rather than 2, 4. This compound is named as a derivative of alkyne and not alkenes. Also, the terminal ‘e’ in ene is dropped because it comes before ‘y’ of yne.

It has a total of 8 isomers, four are primary and two each are secondary and tertiary haloalkanes.

Ratio = 1 because the speed of an electromagnetic wave in vacuum is independent of its wavelength or frequency. Therefore, the ratio of speed of infrared and ultraviolet rays in a vacuum is one.

Primary valence of a metal ion is also known as its oxidation number. The secondary valence is equal to coordination number and it is fixed for a metal. Coordination polyhedra is the term for the spatial arrangements of the groups/ions around the metal.

Plasmids and bacteriophages can replicate within bacterial cells without the help of chromosomal DNA. Thus they are self-replicating and autonomous in nature. They have their own replication machinery.

The different compounds of cobalt(III) chloride with ammonia show distinct properties, most notably with respect to colour and conductivity measurements in solution.

The sequence of DNA from where the replication starts is called the origin of replication. It is also written as ‘ori’. It is also responsible for controlling the copy number of target DNA. Bacteria usually have only one origin of replication.

Polymerase Chain Reaction (PCR) technique can be used to detect genetic disorders in humans.

Polymerase Chain Reaction (PCR) is a technique that can amplify a target DNA segment. This amplified segment aids in the detection of various genetic disorder and further studies. It is a revolutionary method developed by Kary Mullis in the 1980s. Polymerase Chain Reaction (PCR) is based on using the ability of DNA polymerase to synthesize new strand of DNA complementary to the offered template strand. Because DNA polymerase can add a nucleotide only onto a preexisting 3'-OH group, it needs a primer to which it can add the first nucleotide.

Hence, the correct option is (A).