Viruses can replicate inside a host that they infect this is the reason why viruses do not have special structure or enzymes that allows them to make their own food. They just replicate and infect but they never make their own food.
Explanation:
Viruses depend on the host cells that they affect to reproduce. When found outside of host cells, viruses live as a protein coat or capsid, sometimes contained within a membrane. The capsid surrounds either DNA or RNA which codes for the virus elements.
Answer:
Binary fission.
Explanation:
Binary fission: It is known as the asexual reproduction, in which a single organism formed two independent organisms, and also defined as duplication of organisms. This starts with the replication process of DNA within the cell. Before binary fission mitochondria must have replicates its DNA.
After that, the DNA is separated into ends (alternate) of the single cell. One cell becomes two with the help of plasma membrane turns the cell apart. Then each cell is capable of all the function with fully functioning DNA molecule, and cell becomes independent organisms.
b. the highest amount of cations soil can absorb
c. determined by the types of minerals in the soil
d. the layering of soil into horizons
The correct answer is option A
Soil reaction can be defined as the measure of acidity or alkalinity of soil. The pH of the soil or the reaction of the soil is an measurement or indication of the alkalinity or acidity of the soil. This defines the nature of the soil, whether the soil is acidic or basic in nature. If the amount of hydrogen ions is more then the soil is acidic and if the amount of hydrogen ions are less then the soil is basic.
Answer: The correct answer is-
A. organs, but no true body cavity.
Based on the presence of body cavity ( also called coelom), multicellular animals can be classified as acoelomates ( no true body cavity), coelomates ( having true body cavity), pseudocoelomates ( false body cavity).
Roundworms are pseudocoelomic. This means that organs are present but the body cavity is not lined by mesodermal epithelium.
Body cavity is present between the external wall of body and the intestine and it baths the different body organs.
Thus, option A) is the right answer.
Answer:
Option A
Explanation:
All bilateral organisms have coelomates (cavity). However a Pseudocoelomate organism have a false cavity. By false cavity, we mean that there is a body cavity which is filled with fluid and all internal organs bathe in it including alimentary canal system , reproductive system etc. Unlike a coelom, Pseudocoelomate organism do not have body cavity completely lined with mesodermal cells.
hence, option A is correct