IGCSE Biology Paper-3: Specimen Questions with Answers 237 - 239 of 358

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Passage

Fig. shows a species of bacterium, Lactobacillus bulgaricus.

Bacteria from Other Groups

Question 237 (3 of 5 Based on Passage)

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Short Answer▾

List two features that distinguish bacteria from other groups of organisms.

Explanation

Bacteria and Archaea

Question 238 (4 of 5 Based on Passage)

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Explain why the population of L. bulgaricus does not continue to increase during the fermentation to make yoghurt.

Explanation

At death phase (decline phase) , bacteria die. This could be caused by lack of nutrients, environmental temperature above or below the tolerance band for the species, or other injurious conditions.

Question 239 (5 of 5 Based on Passage)

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Bacteria, such as L. bulgaricus, can reproduce rapidly.

Name the process of reproduction in bacteria.

Explanation

Binary fission is a type of asexual reproduction typically observed in prokaryotes and few single-celled eukaryotes. In this method of asexual reproduction, there is a separation of the parent cell into two new daughter cells. This process happens with the division and duplication of the parent՚s genetic matter into two parts, here, each daughter cell receives one copy of its parent DNA. It is a primary method of reproduction in prokaryotic organisms. Binary Fission occurs without any spindle apparatus formation in the cell.

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