1.You are studying the uptake of nutrients into a bacterium under acidic pH, neu

Question

1.You are studying the uptake of nutrients into a bacterium under acidic pH, neutral pH and alkaline pH. The table below shows the transport rate for nutrients under the different pH conditions.

Table 1. Transport rate for nutrients at different pH environments.

Compound

Acidic pH

Neutral pH

Alkaline pH

A

0.5 mM/ sec

0.6 mM/ sec

0.5 mM/ sec

B

60 mM/ sec

30 mM/ sec

3 mM/ sec

C

3 mM/ sec

30 mM/ sec

3 mM/ sec

i.From this information,

what transport mechanism is involved in the uptake of compound A and why?

ii.Compound B and why?

iii.Compound C and why?

Compound

Acidic pH

Neutral pH

Alkaline pH

A

0.5 mM/ sec

0.6 mM/ sec

0.5 mM/ sec

B

60 mM/ sec

30 mM/ sec

3 mM/ sec

C

3 mM/ sec

30 mM/ sec

3 mM/ sec

Explanation / Answer

Answer

i) Passive transport from lower concentration to higher concentration.

ii) Active transport from higher concentration to lower concentration.

iii) Passive transport from lower concentration to higher transport

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