Biology, 09.10.2019 06:30 Leggett8152

How do pathogens spread from one host to another?

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Answer from: sbm1girl

Mainly through bodily fluid. For example, if someone else's blood gets into another person's wound, disease can be spread (such as HIV)

Answer from: oomale

Droplet infection refers to the spread of infection via tiny droplets of fluid that come out of the nose or mouth when someone sneezes or coughs. The droplets contain disease-causing microorganisms. The common cold is easily spread through droplet infection.Direct contact occurs when an infected part of the body is touched by someone else. An example of this is the transmission of sexually transmitted diseases via genital contact.Blood and semen are bodily fluids that can spread illness. If another person's blood gets into an open wound, it can spread diseases such as HIV.A vector is an animal that spreads disease. The mosquito is a common vector that can spread malaria and the West Nile virus.

Answer from: Quest

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

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Answer from: Quest

The light is great source of energy

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