Biology MCQs

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Plague is an infectious disease caused by Yersinia pestis bacteria. It is usually found in small mammals and their fleas. The disease is transmitted between animals via their fleas. As it is a zoonotic bacterium, it can also transmit from animals to humans.

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Vitamin K is required for Normal Blood Circulation. Vitamin K is a fat-soluble vitamin which plays a key role in helping the blood clot, preventing excessive bleeding.

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Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a dilite solution into concentrated one making both the sides equal.

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Chlorophyll, the photosynthetic pigment that gives plants their green color, is present in Algae, Ferns and Mosses, thus enabling them to convert sunlight to chemical energy through photosynthesis. Although fungi are a group of organisms often thought to be plants, they lack chlorophyll, and hence, they are non-photosynthetic, surviving instead on organic matter.

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Viruses are small infectious agents that can replicate only inside the living cells of an organism. Viruses are classified based on the type of genetic material they contain. Some viruses have DNA as their genetic material, while others have RNA. Some viruses have both DNA and RNA as their genetic material.

DNA viruses have double-stranded DNA as their genetic material. They replicate their DNA using the enzymes and machinery of the host cell. Examples of DNA viruses include herpes viruses, pox viruses, and adenoviruses.

RNA viruses have single-stranded RNA as their genetic material. They replicate their RNA using the enzymes and machinery of the host cell. Examples of RNA viruses include influenza viruses, HIV, and coronaviruses.

Viruses that have both DNA and RNA as their genetic material are known as “retroviruses.” These viruses contain a single strand of RNA, but they use an enzyme called reverse transcriptase to convert their RNA into DNA. The DNA is then integrated into the host cell’s genome and replicated along with the host cell’s DNA. Examples of retroviruses include HIV and the human T-cell leukemia virus.

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Alonsoa grandiflora is an ornamental plant

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The useful part of Zingiber officinale is rhizome. It is a flowering plant whose rhizome, ginger root or ginger, is widely used as a spice and also as a medicine. It is a herbaceous perennial plant.

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Alveoli are tiny sacs in our lungs. The main function of the alveoli is the exchange of carbon dioxide for oxygen in the lungs.

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Correct answer is beta-amylase. Regarding amylase there is an interesting fact that it has proved its role in Human evolution. The salivary amylase levels found in the human lineage are six to eight times higher in humans than in chimpanzees, which are mostly fruit eaters and ingest little starch relative to humans.

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Bacterium contain no membrane bound nucleus and rarely contain membrane bound organelles. Simply, most don’t have any large organelles with their own membranes; this means no nucleus, no mitochondria and no chloroplast. Even if a bacteria wanted to have mitochondria , it is couldn’t.