Answer:
a. will contain either a Y chromosome or a X chromosome but not both.
c. reach maturity in the seminal vesicles.
d. contain enzymes in their heads which facilitate penetration of ovum.
Explanation:
Spermatogenesis is a complicated process. It occurs in the seminiferous tubule / seminal vesicle of the testis. The spermatogenesis occurs in 2 steps. In the first step, spermatids are produced. In the second 2nd step, spermatids undergo metamorphosis and form spermatozoa.
The process of formation of spermatozoa is known as spermatogenesis. These are formed from the primary germ cells of the testis. It occurs in 3 phases- multiplication phase, growth phase, and maturation phase.
The maturation phase is important. Here primary spermatocyte divides 2 times. The first division is a meiotic division that produces 2 haploid cells, called secondary spermatocytes.
The second division is a mitotic division. Thus from 2 secondary spermatocytes, 4 spermatids are formed. Further by metamorphosis, the spermatids result in spermatozoa. The spermatozoa have 4 parts - head, neck, middle piece, and a tail. The head is a conical shape. It consists of a nucleus and acrosome.
Acrosome is also called head cap. It secretes a tissue dissolving enzyme which helps to rupture the egg cell. Thus the sperm can penetrate the ovum.
Answer:
The order of bacterial structures that the bacteria would penetrate would be:
- Capsule.
- Lipopolysaccharide Membrane
- peptidoglycan
- Phospholipids Membrane.
Explanation:
A parasite like B. bacteriovorus faces some challenges in getting into a bacterial cell. This is because these cells have devices and strategies to prevent the entry of parasites and ensure the survival of the bacteria. The first challenge would be to penetrate the bacterial capsule. The capsule is a structure that is located around many bacteria. This structure is rigid, with sharp edges and thick thickness, which protects the bacteria from external agents. If B. bacteriovorus manages to go beyond the capsule, it will find a membrane, also thick, composed mainly of lipopolysaccharides, which will also provide protection and try to prevent the entry of the parasite. If this membrane is crossed, B. bacteriovorus will face another layer called peptidoglycan. This layer establishes itself as a cell wall, being very difficult to break. Some bacteria present one more layer after peptidoglycan, which is a membrane made by Phospholipids, which is highly selective and difficult to break, but is more fragile than the previous layers. Only after overcoming all these structures, the parasite will have access to the bacterial cel
Experiment is the best term to describe the step of investigative process.
<h3>Experiment.</h3>
This is a procedure carried out under controlled conditions in order to discover an unknown effect or law, to test or establish a hypothesis, or to illustrate a known law.
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