A retrovirus produces an enzyme, called reverse transcriptase, which copies its RNA genome into DNA. This is opposite of the central dogma because

A) a virus is not an organism.

B) a virus lacks genetic material.

C) the central dogma states that RNA is copied into DNA.

D) the central dogma states that DNA is copied into RNA.


D) the central dogma states that DNA is copied into RNA.

Biology & Microbiology

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This polysaccharide is a chain of glucose units that are modified by having nitrogen-containing groups

It is the main structural fiber in the external skeletons of arthropods and is also a structural material in the cell walls of fungi.

a. chitin b. amylopectin c. cellulose d. glycogen e. amylose

Biology & Microbiology

How do antigen-presenting cells (APCs) acquire the epitopes for presentation?

a. direct infection of the APC b. exocytosis or secretion c. phagocytosis or endocytosis d. diffusion

Biology & Microbiology

What is receptor mediated endocytosis

What will be an ideal response?

Biology & Microbiology

Which of the following describes the fate of most of the water taken up by a plant?

a) It is used as a hydrogen source in photosynthesis. b) It is used as a solvent. c) It makes cell elongation possible. d) It is lost during transpiration. e) It is used to keep cells turgid.

Biology & Microbiology