The 4 of th dna is the answer
Helpful bacteria found in the gut are <u>not pathogens</u>.
Explanation:
An organism is said to be pathogenic if it can invade, grow and multiply in an individual host’s body and cause disease in the susceptible host’s body by evading the immune system of the host.
Viruses belong to obligate pathogen because they require the cellular machinery of the host’s body to grow and replicate and thereby will cause disease in the host.
Disease-causing bacteria are pathogenic like Salmonella, C. difficile, etc.
Helpful bacteria of the gut also called the human gastroinstestinal or gut microbiota, or the gut flora are those bacteria living in the digestive system of the body and improve the gut health. Gut bacteria like Lactobacillus generally help by:
- Forms a central line of resistance or barrier and prevents exogenous bacterial colonization and protects the intestinal mucosa from other pathogens
- Help in fermentation of undigested or nondigestible food or carbohydrates like large polysaccharides of cellulose, pectin etc.
- Gut bacteria belonging to the commensal bacteria help by digesting the available unused nutrients in the body
- Gut bacteria help in the synthesis of certain vitamins
Prokaryotic cells because they don't have a nuclei.
Answer:
True
Explanation:
The regular sequence of growth and division that cells undergo is known as the cell cycle. During the cell cycle, a cell grows, prepares for division, and divides into two new cells, which are called “daughter cells.” Each of the daughter cells then begins the cell cycle again.
Answer:
1-Tener en cuenta el tamaño del objeto a observar para utilizar la lente con el aumento correcto (es decir, 10 X, 40 X o 100 X)
2-Utilizar aceite de inmersión para ver objetos en 100 X
Explanation:
El microscopio óptico posee lentes (ocular y objetivo) los cuales permiten ampliar la imagen del objeto observado. El microscopio simple y el compuesto representan dos tipos de microscopios ópticos. El microscopio compuesto es aquel que utiliza más de una lente para aumentar la imagen observada, mientras que el microscopio simple usa una sola lente (la cual se denomina lupa). El microscopio óptico puede utilizar un aceite de inmersión que permite aumentar la resolución de la imagen a través de la inmersión de la lente objetivo. Es importante señalar que durante el enfocado de la muestra se debe tener sumo cuidado de no acercar demasiado la lente a la superficie del cubreobjeto, ya que esta puede dañarse.
