Diphtheria

Natural infection with C. diphtheriae occurs only in humans and is spread by respiratory droplets. 

The organism colonizes the nasopharyngeal tract and causes little tissue damage, with only a mild inflammatory reaction. 

TLS Online TPP Program

#Id: 363

#XL - R Botany

When cellular iron concentrations return to normal levels, IRP1 is converted to aconitase, and IRP2 undergoes proteolytic degradation, ending the low-iron response.

TLS Online TPP Program

#Id: 9421

#XL - T Zoology

Handicap principle: Long tail feathers function as a sign of an individual’s genetic quality because the bearer must be able to afford this energetically costly trait. 

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#Id: 8071

#XL - Q Biochemistry

Phosphorylation is the most common type of regulatory modification.

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#Id: 8326

#XL - Q Biochemistry

The two ends of microfilament polymerize at different rates:

fast-growing end - plus end

slow-growing end - minus end

TLS Online TPP Program

#Id: 5519

#XL - T Zoology

Age-specific fertility and survivorship data help determine net reproductive rate (R₀).