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. a class of so-called slow viruses
D. proteins that may infect man and other animals causing spongiform encephalopathy
Answer: B
You might also like to view...
An individual with the genotype AaBbCC will produce gametes with which possible assortment of genes?
A) A,B,a,b, or C B) Aa, Bb, or Cc C) ABC, AbC, aBC, or abC D) AaBbCC
Multi-partner associations consisting of a particular fungi and photosynthetic green algae and /or cyanobacteria are called
a. endophytes b. symbiophytes c. crustophytes d. fruticophytes e. lichens
The medically useful compounds some actinomycetes produce when forming aerial mycelia are called ________.
A. primary metabolites B. anti-metabolites C. secondary metabolites D. inhibitory metabolites
Flagella occur in both prokaryotes and eukaryotes. Which of the following statements DOES NOT describe how the flagella of prokaryotes and eukaryotes differ?
A. Eukaryotic flagella have microtubules in a cytoskeleton whereas prokaryotic ones do not. B. Eukaryotic flagella have the motor protein dynein whereas the prokaryotic one does not. C. The eukaryotic flagellum is covered by the plasma membrane whereas that of the prokaryotes is not. D. Prokaryotic flagella have a basal apparatus and hook that rotates the filament whereas eukaryotic flagella do not. E. The filament of eukaryotes is multilayered whereas that of prokaryotes is a single strand.