TLS Online TPP Program

#Question id: 4602


If the bacterium Staphylococcus aureus experiences a cost for maintaining one or more antibiotic-resistance genes, what would happen in environments that lack antibiotics?

#XL - S Microbiology
  1. These genes would be maintained in case the antibiotics appear.

  2. These bacteria would be outcompeted and replaced by bacteria that have lost these genes.

  3. These bacteria would try to make the cost worthwhile by locating and migrating to microenvironments where traces of antibiotics are present.

  4. The number of genes conveying antibiotic resistance would increase in these bacteria.

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TLS Online TPP Program

#Question id: 10332

#XL - S Microbiology

The four-chambered hearts of birds and the four-chambered hearts of mammals evolved independently of each other. If one were unaware of this independence, then one might logically conclude that

TLS Online TPP Program

#Question id: 10334

#XL - Q Biochemistry

N2 combines with hydrogen to form ammonia under elevated temperature (about 200°C) and high pressure (about 200 atmospheres) and in the presence of a metal catalyst (usually iron). The extreme conditions are required to overcome the high activation energy of the reaction. This nitrogen fixation reaction, called

TLS Online TPP Program

#Question id: 10335

#XL - Q Biochemistry

plants can store high levels of nitrate, and they can translocate it from tissue to tissue without deleterious effect. Yet if livestock or humans consume plant material that is high in nitrate, they may suffer with,

TLS Online TPP Program

#Question id: 10336

#XL - Q Biochemistry

methemoglobinemia, a disease, What will cause inside the human body?

TLS Online TPP Program

#Question id: 10337

#XL - Q Biochemistry

In biological nitrogen fixation, the process of nitrification by organism respective bacteria A--which convert the ammonia to nitrite and B--- further converted into nitrate in the soil by their respective A and B bacteria known as;

TLS Online TPP Program

#Question id: 10338

#XL - Q Biochemistry

Nitrate from the soil solution actively absorb by Plant roots via several low- and high-affinity transporters known as