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The nucleus<span> maintains the integrity of genes and </span>controls<span> the activities of the </span>cell<span> by regulating gene expression.
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Plants with an internal tubal system that transports water and nutrients to different plant parts are <span>vascular.
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>Vascular plants</span> <span>are types of plant having a vascular system.
>Vascular system means it is composed of a xylem and phloem
>non vascular plants are types of plants with no vascular system.</span>
Answer:
Small Intestine
Explanation: After the stomach in the alimentary canal comes the small intestine.
Answer:
We have just seen that pathogens constitute a diverse set of agents. There are correspondingly diverse ranges of mechanisms by which pathogens cause disease. But the survival and success of all pathogens require that they colonize the host, reach an appropriate niche, avoid host defenses, replicate, and exit the infected host to spread to an uninfected one. In this section, we examine the common strategies that are used by many pathogens to accomplish these tasks.
Explanation:
The first step in infection is for the pathogen to colonize the host. Most parts of the human body are well-protected from the environment by a thick and fairly tough covering of skin. The protective boundaries in some other human tissues (eyes, nasal passages and respiratory tract, mouth and digestive tract, urinary tract, and female genital tract) are less robust. For example, in the lungs and small intestine where oxygen and nutrients, respectively, are absorbed from the environment, the barrier is just a single monolayer of epithelial cells.
Skin and many other barrier epithelial surfaces are usually densely populated by normal flora. Some bacterial and fungal pathogens also colonize these surfaces and attempt to outcompete the normal flora, but most of them (as well as all viruses) avoid such competition by crossing these barriers to gain access to unoccupied niches within the host.
For an individual to have the behavioral expression of the disorder pku, the individual must inherit a recessive combination of alleles and be exposed to phenylalanine in the diet.
What is pku?
A rare genetic condition known as phenylketonuria, or PKU, causes the body to accumulate phenylalanine, an amino acid. The phenylalanine hydroxylase (PAH) gene is altered in PKU. The enzyme required to degrade phenylalanine is produced in part because to this gene.
When a person with PKU consumes protein-containing foods or aspartame, an artificial sweetener, a dangerous buildup of phenylalanine can occur because this person lacks the enzyme required to break down phenylalanine. This may ultimately result in severe health issues.
To learn more about phenylketonuria click on the link below:
brainly.com/question/3711599
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