Question

The head of mature mammalian sperm is made up of
A. An acrosome
B. Elongated nucleus covered by acrosome
C. Two centrioles and an axial filament
D. Nucleus, acrosome, cytoplasm and mitochondrial sheath

Answer 1

The mammalian sperm cell comprises a head, a midpiece and a tail. The head contains the nucleus with thickly coiled chromatin strands, encircled anteriorly by an acrosome, which contains enzymes utilized for entering the female egg.

Complete answer:
The spermatozoon, which plays out the capacity of conveying hereditary material from the male to the oocyte, comprises two head parts= head and tail.

Structure of head of sperm:
The sperm head comprises for the most part the nucleus and acrosome. Its shape, size and structure fluctuate extraordinarily in various groups of vertebrates. The head of sperm performs two capacities—hereditary and activation.
The hereditary capacity is encapsulated in the sperm nucleus which comprises primarily of DNA in addition to nuclear proteins and along these lines is answerable for the transmission of genetic characters from the male. The nucleus of the sperm involves a significant aspect of the head and its shape, at last, decides the state of the head of sperm. At the front end of the sperm nucleus happens a cap-like structure called acrosome.
An enormous number of chemicals particularly hydrolases are additionally present in the acrosome. It additionally contains two most significant chemicals, for example, hyaluronidase and zona Lysin or acrosin which capacities during sperm passage into the ovum. Next to no cytoplasm happens in the middle of the nucleus and plasma membrane of the sperm head. The cytoplasm in the middle of the membrane of the acrosomal vesicle and sperm plasma membrane is called peri acrosomal cytoplasm.

Hence, the correct answer is option (B).

Note: The top of the sperm contains the nucleus which is answerable for the development of zygote since it will intertwine with the ova. The nucleus contains chromosomes. There is a sperm cap present which is known as the acrosome present on the head of the sperm. Acrosome contains lytic enzymes for the disintegration of membranes of the ovum.