Unit 2 Micro Genetics, virus, methods of destrucrtion

Viruses exhibit all the following except ______.

•  

  ultramicroscopic size

•  

  ability to infect host cells

  
  

• metabolism

• genes

•  

  definite shape

  
  

Viral capsids are made from subunits called ______.

• prophages

• envelopes

• capsomeres

• spikes

• peptones

Eukaryotic chromosomes differ from bacterial chromosomes because only eukaryotes have _______.

•  

  elongated, not circular, chromosomes

  
  

•  

  All of the choices are correct.

  
  

•  

  several to many chromosomes

  
  

•  

  chromosomes in a nucleus

  
  

•  

  histone proteins

  
  

Eukaryotic chromosomes differ from bacterial chromosomes because only eukaryotes have

A nucleosome is a linear chromosome wound around the _______.

•  

  nuclear membrane

  
  

• histone

• rRNA

• nucleolus

• mRNA

Which is incorrect about purines?

•  

  They are always paired with a specific pyrimidine.

  
  

•  

  They include adenine and guanine.

  
  

•  

  They are found within nucleotides.

  
  

•  

  They are only found in DNA, not in RNA.

  
  

•  

  They are nitrogenous bases.

  
  

Which of the following microbial forms has the highest resistance to physical and chemical controls?

• Yeast

•  

  Bacterial endospores

  
  

•  

  Naked viruses

  
  

•  

  Fungal spores

  
  

•  

  Protozoan cysts

  
  

The process that destroys or removes all microorganisms and microbial forms, including bacterial endospores, on inanimate objects is ______.

• sanitization

• disinfection

• antisepsis

• sterilization

Helical and icosahedral are terms used to describe the shape of a viral ______.

• spike

• capsid

• capsomere

• core

• envelope

One of the principal viral capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as a/an _______ capsid.

• helical

• icosahedral

• spiked

• complex

A naked virus only has a/an ______.

• capsomere

•  

  antigenic surface

  
  

• envelope

• nucleocapsid