Biology MCQs

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White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells.

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Turmeric is a product of Curcuma longa, a rhizomatous herbaceous perennial plant belonging to the ginger family Zingiberaceae. They are native to tropical South Asia. There are 133 species of Curcuma all around the world.

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Brachytherapy is commonly used as an effective treatment for cervical, prostate, breast, and skin cancer in many parts of the world. Brachytherapy is an offshoot of Radiotherapy.

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Bombay Blood Group is an extremely rare ABO group, called so because it was first discovered among some people in Bombay. Their red cells lack ABH antigens and their sera contain anti-A and anti-B and anti-H. The anti-H would not be detected in the ABO group but would be detectable in pretransfusion tests. People who have Bombay phenotype can donate to any member of the ABO blood group system (unless some other blood factor gene, such as Rhesus, is incompatible), but they cannot receive any member of the ABO blood group system`s blood (which always contains one or more of A and B and H antigens), but only from other people who have Bombay phenotype

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Escherichia coli, also known as E. coli, is a Gram-negative, facultative anaerobic, rod-shaped, coliform bacterium of the genus Escherichia. It is a type of bacteria that normally lives in your intestines.

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BOD is amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period, for running rivers, it would be minimum and for Untreated Municipal waste water it would be maximum.

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Eukaryotic cells feature a true nucleus and membrane-bound organelles. Fungi, algae, and protozoa are all eukaryotic organisms. In contrast, bacteria are prokaryotic, lacking a true nucleus and such organelles. Therefore, only Fungi, Algae, and Protozoa (1, 3 and 4) possess eukaryotic cells, while bacteria do not.

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In Binominal nomenclature, the name of organisms is in genus species pattern. The second word in an organism’s scientific name refers to one species within the genus; is the specific epithet but actually gives no clue as to species if used alone.

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The higher the classification category, the more inclusive it is. Here phylum is highest so is most inclusive.

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A cytotoxic T cell (also known as TC, cytotoxic T lymphocyte, CTL, T-killer cell, cytolytic T cell, CD8+ T-cells or killer T cell) is a T lymphocyte that kills cancer cells, cells that are infected or cells that are damaged in other ways.