1. Which among the following is the most important role played by Ribosome in the cells?
[A] Synthesis of RNA
[B] Synthesis of DNA
[C] Synthesis of Proteins
[D] Metabolism of Carbohydrates
Show Answer
Correct Answer: C [Synthesis of Proteins]
Notes:
The most important role played by Ribosome in the cells is the synthesis of proteins. Ribosomes are composed of special proteins and nucleic acids.
2. The acidic medium of gastric juice along with an enzyme Pepsin breaks the proteins down into smaller parts known as _____?
[A] Peptides
[B] Peptones
[C] Peptose
[D] Amino Acids
Show Answer
Correct Answer: B [Peptones]
Notes:
The acidic medium of gastric juice and the enzyme pepsin break down proteins into smaller parts known as peptones. Pepsin is the main enzyme involved in protein digestion. It breaks down proteins into smaller peptides and amino acids that can be easily absorbed in the small intestine.
The gastric juice contains hydrochloric acid, which helps maintain the pH in the range of 1.5 to 2.5. This pH range is very acidic and is necessary for optimum activity of pepsin. The hydrochloric acid converts inactive enzymes (zymogens) into active enzymes.
The gastric glands in the stomach secrete the enzyme pepsin. When pepsinogen is released into the stomach and mixed with gastric juice, it is converted into pepsin.
3. MON 863 is a genetically engineered variety of which among the following?
[A] Soya Bean
[B] Maize
[C] Rice
[D] Tomato
Show Answer
Correct Answer: B [Maize]
Notes:
MON 863 is a genetically engineered variety of maize produced by Monsanto. It was generated by transformation of Zea mays cell culture line AT824 with a MIuI restriction fragment from plasmid PV-ZMIR13 using particle acceleration technology.
4. Bile is secreted by which of the following cells?
[A] Hepatocytes
[B] Brown Fat Cells
[C] Lymphocytes
[D] Somatocytes
Show Answer
Correct Answer: A [Hepatocytes]
Notes:
Bile is secreted by Hepatocytes. It is a complex aqueous secretion that originates from hepatocytes. It is modified distally by absorptive and secretory transport systems in the bile duct epithelium.
5. Which among the following plays a role in production of alcohol in beer?
[A] Bacteria
[B] Protozoan
[C] virus
[D] Yeast
Show Answer
Correct Answer: D [Yeast]
Notes:
Yeast plays a role in production of alcohol in beer. Yeast is a little, single-cell organism and is one of the simplest forms of plant life. It is responsible for the fermentation process in beer.
6. Which among the following is a main structural axes of a vascular plant?
[A] Thallus
[B] Leaves
[C] Stem
[D] Flower
Show Answer
Correct Answer: C [Stem]
Notes:
Stem is a main structural axes of a vascular plant. The stem transports water, minerals, and food to other parts of the plant; it may also store food, and green stems themselves produce food.
7. Which among the following is a correct definition of Saprophytes?
[A] A parasitic plant that can complete its life cycle independent of a host
[B] A heterotrophic plant that feeds upon other living plants
[C] A heterotrophic plant that feeds upon dead organic matter
[D] A plant that is unable to synthesize a particular organic compound
Show Answer
Correct Answer: C [A heterotrophic plant that feeds upon dead organic matter]
Notes:
lysotrophic nutrition or Saprotrophic nutrition is a process of chemoheterotrophic extracellular digestion which is involved in the processing of decayed organic matter. It occurs in saprotrophs, and is most often associated with fungi and soil bacteria.
8. Which among the following helps to determine the character of a cell?
[A] Nucleus
[B] Chromosomes
[C] Genes
[D] Plasma
Show Answer
Correct Answer: C [Genes]
Notes:
Genes helps to determine the character of a cell. Gene is the basic physical and functional unit of heredity and are made up of DNA. Some of the genes act as instructions to make molecules called proteins.
9. Which among the following sets of fauna represents same taxonomical order?
[A] Whales, Dolphins, Porpoises
[B] Dolphins, Porpoises, Dugong
[C] Whale, Dugong, Porpoises
[D] Dolphins, Dugong, Manatees
Show Answer
Correct Answer: A [ Whales, Dolphins, Porpoises ]
Notes:
Marine mammals are a diverse group of animals. They include cetaceans (whales, dolphins, and porpoises), sirenians (manatees and dugong), pinnipeds (true seals, eared seals and walrus), a few otters (the sea otter and marine otter) and the polar bear (usually grouped with the marine mammals).
10. Why does running up stairs make a person feel more tired than walking?
[A] He does more work when running than walking
[B] His power output is greater when running than walking
[C] His gravitational force is greater when running
[D] He has more inertia when running than walking
Show Answer
Correct Answer: B [His power output is greater when running than walking]
Notes:
Running up stairs requires the same work but in less time, increasing power output. Higher power leads to more rapid energy use, causing greater fatigue. Work (energy) is force times distance, but power is work divided by time, which is higher when running.
