Answer:
The correct answer is D. The outermost layer of a virion fullfills both protection and recognition functions of the virus.
Explanation:
A virion is a single viral particle. In this form the virus is physically isolable but without metabolic activity. Many virions can even be crystallized.
A virion, infecting a single host cell, is capable of producing thousands of descendants using the mechanisms of DNA replication, transcription and translation of the infected cell. This viral multiplication is often sufficient to kill the host cell by breaking it (lysandola).
Nucleic acid gives infectious power to the virion. It is enclosed by a protein wrap called capsid which is always formed by a number of individual proteins, called structural subunits. These subunits, associating in a specific way, form larger complexes called capsomeres. The set of nucleic acid and proteins is called the nucleocapsid of the virus, which can be enclosed by a membrane called pericapside envelope. Viruses without this membrane are called naked. Virus membranes are made up of a lipid bilayer, often associated with virus-specific proteins. The main function of the envelope is to help the virus enter the host cell. The surface glycoprotein serves to identify and bind to the receptor points in the host membrane. The viral envelope is then fused with the cell membrane, allowing the capsid and the viral genome to enter.
A step further down the evolutionary scale is the virino and below it the viroid and the prion; higher up is the virus.
Answer:
soil is saturated with water when dissolved in water
Explanation:
soil is composed of organic material, minerals and rocks. when we dissolve soil in water, some particles settles down and organizing parts mixed with water.
The answer is A, Sound waves must have materials to bump together to transfer the waves.
Answer no 1:
A pedigree can be described as a chart or a diagram which illustrates the patterns of inheritance among generations of a family. Family history is very important to know the genetic history of a disease and how it runs in a family. A pedigree will let know that what are the probabilities of a disease to occur in the offsprings based on the genetic history.
Answer no 2:
A punnet square can be described as a diagram which predicts the result of a cross. A genetic cross will let scientists know about the genotype and phenotype of the offsprings that will be produced. It will let us know about carriers as well probability of a disease to occur in offsprings.
Answer:
A high level of gene flow into a population tends to be considered to have equivalent allele frequencies and therefore effectively be a single population.
Hope this helps
--Jay
