Answer:
d. viriod
Potato spindle-tuber disease, which causes potatoes to become gnarled and cracked, is caused by an infectious agent consisting of a small circular RNA molecule that totally lacks a protein coat. These infectious agents are thought to exert their effects by interfering with the cell's normal path of gene expression. Such an infectious agent is known as a(n): <u>viriod</u>.
Explanation:
Viriods are very small , covalently closed, circular RNA molecules capable of autonomous replication and induction of disease.
They range in size from approximately 20nm and are infectious particles.
They consist only of Nucleic acid (RNA) and exert their effects by interfering with the cell's normal path of gene expression.
They mainly cause diseases in Plants.
As in the potato spindle-tuber disease, the infectious agent has all the characteristics as that of a virioid. Hence <u>Viriod</u> is the right choice.
This is an example that they 2 fruit flies are A. Homozygous. In terms of its genotype, these fruit flies posses the same alleles for the gene responsible for colour or pigment production in the flies' eyes.
Would need a strong background in biology and ... B. Chemistry
False. Streams lose velocity when the slope of the stream bed decreases.
Because nitrogen is a key component plants use to make chlorophyll and the key component in amino acids which make protein