Tag: bacteria

Quizzes (10) Questions (167)

Questions Related to bacteria

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Select the wrong statements.
A. Pyruvic acid decarboxylase and alcohol dehydrogenase catalyse fermentation.
B. $NADH+H^+$ is reoxidised to $NAD^+$ in alcohol and lactic acid fermentation.
C. Yeasts poison themselves to death when the concentration of alcohol reaches about $31$ percent.
D. Prolonged fermentation results greater alcohol contents in alcohol beverages.

  1. C and D

  2. A and B

  3. B and C

  4. A and D
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yeast cells are typically killed by alcohol concentrations around 12-14 percent, not 31 percent. Prolonged fermentation does not indefinitely increase alcohol content because the yeast dies.

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

The meiospores of yeast are nonmotile and called?

  1. Aeciospores

  2. Aplanospores

  3. Ascospores

  4. Basidispores
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In ascomycetes fungi, which include yeasts, sexual spores are produced endogenously inside a sac called an ascus and are known as ascospores. These spores are nonmotile.

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Match the contents of Column-I with of Column-II.

Colum-I Column-II
A Monascus purpurens i Statins
B Aspergillus niger ii Cyclosporin-A
C Trichoderma polysporum iii Citric acid

  1. A-i, B-ii, C-iii

  2. A-i, B-iii, C-ii

  3. A-iii, B-i, C-ii

  4. A-ii, B-i, C-iii
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Monascus purpureus produces statins which act as blood-cholesterol lowering agents. Aspergillus niger produces citric acid, and Trichoderma polysporum produces cyclosporin-A used as an immunosuppressive agent.

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

The bacteria which lacks flagella and moves by gliding are included in?

  1. Spirochetes

  2. Rickettsia

  3. Myxobacteria

  4. Eubacteria
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Myxobacteria are a group of bacteria that typically lack flagella and move by gliding over surfaces, often forming complex multicellular fruiting bodies. Spirochetes move via axial filaments, and eubacteria frequently possess flagella.

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Bacteroides are?

  1. Enlarged non-motile cellular bacteria Rhizobium leguminosarum in root nodules of legumes

  2. A bacterial cell infected with viruses

  3. A motile bacterium

  4. Nitrosomonas bacteria in soil
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacteroids are the differentiated, non-motile form of Rhizobium bacteria found within the root nodules of legumes, where they fix nitrogen.

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Which of the following is common features of Amoeba?

  1. Pseudopodia, food vacuole, phagocytosis, assimilation and egestion

  2. Phagocytosis, contractile vacuole, lysosome, holozoic and ingestion

  3. Contractile vacuole, absorption of food, egestion and grinding of food particles

  4. Pseudopodia, ciliary movement, contractile vacuole and phagocytosis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An Amoeba is a type of organism belongs to kingdom Protista. They have the ability to alter its shape, primarily by extending and retracting pseudopods. Amoeba has contractile vacuole which expels excess water from the cell. The various processes which are involved in the nutrition of Amoeba are:
Ingestion, digestion, absorption, assimilation and egestion. Amoeba has not excretory organs. The undigested food collects inside the Amoeba is thrown out of the body by the cell membrane. Thus, the correct answer is option A.