10) What is the function of reverse tanscriptase A) II hydrolyzes the host cells

Question

10) What is the function of reverse tanscriptase A) II hydrolyzes the host cells DNA. B) It uses viral RI A as a lermg late for DNA syes C) It converts host cell RNA into viral DNA D) It translates viral RNA into proteins. in retrovire E) It uses viral RNA as a template for making complementlary 11) All of the following are KNA strands characteristics of the pylum Cnidarin excep A) a gastrovascular cavity B) a polyp stage. C) a medusa stage. D) cnidocytes. E) a pseudocoelom. 12)Which characteristic is shared by both cnidarians and flatworms? A) dorsoventrally flattened bodies B) flame cells C) radial symmetry E) both A and D 13)What is the correct sequence of the following four events during an animal's development? 1. gastrulation metamorphosis 3. fertilization 4. cleavage A) 4, 3, 2, 1 B) 4, 3, 1,2 C) 3, 2,4,I D) 3, 4, 2, 1 E) 3, 4, 1.2 14.) Seed plants lack which of the following structures? A) Ovules surrounded by integuments B) Microspores and megaspores C) Vascular tissues D) A large, nutritionally independent sporophyte E) A large nutritionally independent gametophyte. , produce an egg; the male gametang 15). The female gametangium, or_ or A) Antheridium; archegonium B) Archegonium; magaphyll C) Archegonium; antheridium D) Magasporangium; antheridium E) Magasporagium; megaphy produce sperm cells.

Explanation / Answer

Ans 10. The correct option is option B. It uses viral RNA as a template for DNA synthesis. The enzyme reverse transcriptase which is widely found in retroviruses. The retrovirus places its RNA genome into the host cell which synthesis DNA from it. It widely observed in common viral disease such as AIDS.

Ans 11. The correct option is option E which is pseudocoelom which means phylum cnidaria belongs to acoelomates which means it is characterised by no true body cavity which is the absence of coelum. The rest all characteristics are observed in phylum cnidaria.

Ans 12. The correct option is option D the common feature in both of them is that they have a digestive system with a single opening.

Ans 13. The correct option is option E. Fertilization, cleavage, gastrulation and metamorphosis.

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