Viroids cause a variety of plant diseases and are composed only of:
a. strands of RNA.
b. strands of DNA.
c. protein coats.
d. peptidoglycan.
e. a capsid.
A
You might also like to view...
In every physical or chemical change, energy cannot be created nor destroyed. This is the ________ law of thermodynamics.
Fill in the blank(s) with the appropriate word(s).
Members of the ____ subphylum, including shrimp, lobsters, and crabs, generally have five pairs of appendages on
their heads: two pairs of antennae and three pairs of mouthparts, including mandibles.
a. Myriapoda b. Trilobita c. Chelicerata d. Hexapoda e. Crustacea
Viruses that kill their host cells during each cycle of infection are called
a. virulent bacteriophages. b. bacteriophages. c. temperate bacteriophages. d. phages. e. avirulent bacteriophages.
Prokaryotes
a. have nucleoid regions. b. are unicellular. c. may have cell walls. d. are either bacteria or archaeans. e. are all of these.