Answer:
b. Mutations that inactivate tumor suppressor genes are important in cancer.
Explanation:
Most cancers have inactivating mutations in one or more proteins that normally,Cancer can result from expression of mutant forms of these proteins: growth factors and mutation in only one of the two alleles is sufficient for induction of cancer, the cells from tumors caused by these viruses is near the c-myc gene.
The answer is B, unicellular
veins carry deoxygenated blood back to the heart.
Answer: False
Explanation:
Ticks are the external parasites which survive by feeding the blood of the birds, reptiles, amphibians and mammals. Various species of the ticks are distributed world wide. They colonize and live in the countries with warm and humid climatic conditions. The moisture help them to undergo metamorphosis. There are many species in the families of lxodidae (hard ticks) and Argasidae (soft ticks) that are active parasites and are capable of causing diseases in humans.
The answer is Filarial parasites. They belong to the group of roundworms of the Filarioidea type. An example of a filarial worm is the Wuchereria bancrofti. These organisms cause lympathic filariasis (LF) which is characterized by edema. They are spread by the mosquito vector.