Biology, 13.02.2020 03:26 kayleeblanton1132

A specific virus always infects Choose one: A. The number of species depends on the virus. B. a wide range of species. C. only a single species. D. a small number of closely related species in the same genus.

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Answer from: sarahjunexx

The correct answer is A. The number of species depends on the virus

Explanation:

All the viruses are intracellular parasites which means they have to find their host in which they can live and reproduce. All viruses can only infect a certain number of species which depends on the virus.

In hosts like mammals, they infect only specific types of cells which are also dependent on virus type. They inject their genetic material in host cells and takes control of host cell machinery by ligating its genetic material in the host genome. So the correct answer is A.

Answer from: Quest

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

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.

explanation:

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A specific virus always infects Choose one: A. The number of species depends on the virus. B. a wide...

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