Swimming towards a chemical of bacteria is termed as
A.positive chemotaxis
B. negative chemotaxis
C. phototaxis
D. magnetotaxis
Answers
Swimming towards a chemical of bacteria is termed as positive chemotaxis.
Chemotaxis (from chemo- + taxis) is the movement of an organism or entity in response to a chemical stimulus. Somatic cells, bacteria, and other single-cell or multicellular organisms direct their movements according to certain chemicals in their environment.
The movement away is defined as negative chemotaxis (repellent).
The movement towards a higher concentration of a stimulating substance is defined as positive chemotaxis (attractant).
Phototaxis
1. It in the broadest sense means positive or negative displacement along a light gradient or vector.
2. Prokaryotes most often use a biased random walk strategy, employing type I sensory rhodopsin photoreceptors and two-component signalling to regulate flagellar reversal.
Magnetotactic bacteria (MTB);
1. These are widespread, motile, diverse prokaryotes that biomineralize a unique organelle called the magnetosome.
2. These consist of a nano-sized crystal of a magnetic iron mineral that is enveloped by a lipid bilayer membrane.
Options (b), (c), and (d) are incorrect.
Hence option (a) is the correct answer.
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