Both Gram-positive and Gram-negative bacteria commonly have a surface layer called an S-layer. In Gram-positive bacteria, the S-layer is attached to the peptidoglycan layer. Gram-negative bacteria's S-layer is attached directly to the outer membrane). Specific to Gram-positive bacteria is the presence of teichoic acids in the cell wall
However, there are cases where the color may appear yellowish, sometimes referred to as âyellow spermâ or âyellow semenâ. The cause of yellow sperm is uncertain but it is believed that it can be caused by infection, or foods which are rich in sulfur such as garlic and onions.Another possible cause for yellow semen could be the natural thickening of semen; especially if you have not ejaculated for quite some time.he cause of yellow sperm is uncertain but it is believed that it can be caused by infection, or foods which are rich in sulfur such as garlic and onions.
There is no such thing. Sperm are sperm, they do not come in  different colours or levels of translucence. The question you may  have is the consistency and colour of semen, â¦ which is what is  ejaculted from the penis. Clear semen may not be semen at all, but  pre-seminal fluid which may contain few sperm cells.Seminal fluid  is the off-whitish fluid that contains many sperm cells and is the  constituent for which conception of offspring, if intercourse is  successful, is achieved.here is no such thing. Sperm are sperm, they do not come in  different colours or levels of translucence. The question you may  have is the consistency and colour of semen, â¦ which is what is  ejaculted from the penis. Clear semen may not be semen at all, but  pre-seminal fluid which may contain few sperm cells.