Glycoprotein spikes protruding from the outer surface of viral envelopes functio

Question

Glycoprotein spikes protruding from the outer surface of viral envelopes function as a. cell lysis factors. b. factors needed for the site specific recombination. c. factors that bind to host cells. d. toxins. Viroids are a. a new class of small single stranded DNA viruses that infect some animals. b. short infectious single stranded RNAs that can infect some plants c. proteins that may infect man and other animals causing spongiform encephalopathy. d. a class of so-called slow viruses. Prions are of significance because they cause infections of _____ a. plants. b. fungi. c. prokaryotes. d. domestic animals and humans. For a temperate phage to produce more phage, which of the following must happen? _____ a. Induction b. Lysogenic conversion c. Prophage formation d. Lysogeny Two major types of symmetry found in viruses include _____ a. radial and bilateral b. helical and radial. c. icosahedral and radial. d. icosahedral and helical. During cytokinesis, a critical step in separation is the assembly of the _____ a. spindle body b. replisome c. cytoskeletal spiral d. Z ring DNA replication in bacteria begins at _____ a. a single origin and proceeds in one direction. b. a single origin and proceeds in both directions. c. two origins and proceeds in both directions. d. multiple origins and proceeds in multiple directions. The actin-like protein that seems to be involved in determining cell shape is _____ a. MreB. b. FtsZ.

Explanation / Answer

26) glycoprotein spikes on capsid of viruses helps them to interact with host cells receptors . Answer (C)

27.viroids are small circular strands of RNA that are devoid of a protein coat and mostly infect plants. Answer(B)

28.prions are protinaceous infectious agents. they cause diseases in humans and domestic cattle. some examples of prion disease are creudzfelt-jacob disease. Answer(D)

29.when the host cell is damaged by certain external factors example UV radiation , induction takes place, during induction the lysogenic phase is converted into lytic phase producing large number of phages Answer(A)

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