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TLS Online TPP Program

#Question id: 3041

Which statement about gram-negative bacteria is correct?

#XL - S Microbiology

  1.  Penicillins are the best antibiotics to use against them.

  2. They often possess an outer membrane containing toxic lipopolysaccharides.

  3. Their chromosomes are composed of DNA tightly wrapped around large amounts of histone proteins.

  4. Their cell walls are primarily composed of peptidoglycan.

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TLS Online TPP Program

#Question id: 3786

#XL - Q Biochemistry

E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged. What density distribution of DNA would you expect in this experiment?
TLS Online TPP Program

#Question id: 3788

#XL - Q Biochemistry

The spontaneous loss of amino groups from adenine in DNA results in hypoxanthine, an uncommon base, opposite thymine. What combination of proteins could repair such damage?
TLS Online TPP Program

#Question id: 3789

#XL - Q Biochemistry

What do telomeres do?
TLS Online TPP Program

#Question id: 3790

#XL - Q Biochemistry

Semiconservative replication of DNA means that:
TLS Online TPP Program

#Question id: 3791

#XL - Q Biochemistry

 In vitro systems used to study replication must include all of the following except:
TLS Online TPP Program

#Question id: 3792

#XL - Q Biochemistry

Strain introduced by unwinding DNA at the replication forks is relieved by