1. Are starfish or squid more closely related to mammals 2. How do bacteria feed and...
1. Are starfish or squid more closely related to mammals
2. How do bacteria feed and reproduce?
3. List the 3 bacterial shapes and give an example of a bacterium for each shape.
Homework Answers
Question2: 2. How do bacteria feed and reproduce?
Answer:
Bacteria feed on carbohydrates and perform fermentation either by aerobic or anaerobic method.
Oxidative fermentation (OF):
In the given sample bacteria fermented the carbohydrate (glucose, sucrose) aerobically and the result is the indicative of acid production in the open culture Durham tube (aerobic respiration occurred) and oil covered culture tube (anaerobic respiration occurred). The resultant acid produced converts, bromthymol blue PH indicator colour from green to yellow. We can assess the PH of the fermented product based on its acidic nature. We cannot determine the amount of acid produced here and also we cannot predict the gas (in the form of bubbles) liberated upon OF which is significant to identify a particular unknown bacteria inside the medium. The turbidity inside the yellow broth represents bacterial motility.
Bacterial reproduction: Binary fission
Binary fission is a type of asexual reproduction because there is no exchange of genetic material of two bacteria of same genus. Single bacteria undergo both karyokinesis and cytokinesis during binary fission finally results in two similar daughter cells and undergoes somatic development to produce remaining cellular components.
Question-3:
Bacterial shapes
1. Bacilli ----> rod shaped bacteria ---> example, Bacillus subtilis
2. Cocci shape ---> circular shaped bacteria ---> example, Streptococcus
3. Vibrio -------------> Comma shaped bacteria ---> Vibrio cholera
Add Answer to:
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