Tag: gm crops

Questions Related to gm crops

A genetically modified crop can be formed by inserting the genes of

botany biotechnology and genetic engineering stds and infertility gm crops biotechnology

  1. Another plant

  2. Bacteria

  3. Some animals

  4. All of the above

Show answer
Correct Option: D
Explanation:

Genetically modified crops (GMCs, GM crops or biotech crops) are plants used in agriculture, the DNA of which has been modified using genetic engineering techniques. In most cases the aim is to introduce a new trait to the plant, which does not occur naturally in the species. 

Examples in food crops include resistance to certain pests, diseases or environmental conditions, reduction of spoilage or resistance to chemical treatments (e.g., resistance to a herbicide) or improving the nutrient profile of the crop. 
Examples in non-food crops include production of pharmaceutical agents, biofuels and other industrially useful goods, as well as for bioremediation. A genetically modified crops can be formed by inserting the genes of other plants, bacteria, animals, etc.

Which country has decided to label those GM foods that are found to be safe?

botany biotechnology and genetic engineering stds and infertility gm crops biotechnology

  1. Brazil

  2. China

  3. Japan

  4. South Africa

Show answer
Correct Option: C
Explanation:

Genetically modified foods or GM foods, also genetically engineered foods, are foods produced from organisms that have had changes introduced into their DNA using the methods of genetic engineering.

Mandatory labeling of GM foods that are found to be safe is practised in the European Union, Japan and New Zealand.
Therefore, the correct answer is option C.

Which statement about genetically modified (GM) foods is false?

botany biotechnology and genetic engineering stds and infertility gm crops biotechnology

  1. Scientists have used genetic modification, in various forms, as a means of improving crop yields, crop quality, and pest resistance for many years.

  2. Genetic modification includes products made by artificial mutagenesis and by non-natural crosses between unrelated spscies.

  3. A major difficulty in labelling foods as GM-free is that it is virtually impossible to measure genetically modified DNA or protein molecules in most food made from GM crops.

  4. The recent decision by McCain foods to stop processing GM potatoes means that they will eventually use less pesticides to produce the potatoes that are required to make fries.

  5. A major environmental concern with GM crops is that engineered genes will escape into the environment, resulting in the origin of superweeds (aggressive undersirable plant species).

Show answer
Correct Option: D
Explanation:

McCain foods has decided to stop processing genetically modified potatoes, because of pressure from consumers who fear damage to the environment and human health. 

Thus, the correct answer is option C.

NaCl is harmful to most crop plants. A scientist at the University of Toronto genetically modified plant so that it could be grown in dry parts of the world where the available water has a high level of NaCl. This genetically modified plant crop with the high levels of NaCl by transporting salt into its vacuoles where it accumulates to abnormally high levels. Which feature would be observed in the genetically modified plant when compared to a non-modified plant?

botany biotechnology and genetic engineering stds and infertility gm crops biotechnology

  1. The leaves in the modified plant are more yellow in colour.

  2. The modified plant has salt crystals on the surface of its leaves.

  3. The cytosol (the material between the plasma membrane and the vacuole membrene, excluding the organelles) in the modified plant has a lower osmotic pressure.

  4. The cytosol in the modified plant has a higher osmotic pressure.

  5. The osmotic pressure is the same in both plants.

Show answer
Correct Option: D
Explanation:

In conditions of high salinity, an important mechanism to survive salt stress relies on the accumulation of excess cytoplasmic Na+ in vacuoles, reducing the amount in the cytoplasm and providing osmotic pressure. The transgenic plants accumulate more Na and K in their leaf tissue. The increased accumulation of sodium is due to the consequence of the activity of the vacuolar sodium proton antiporter. The net increase in the concentration of solutes in the cell leads to an increase in the uptake of water so that the transgenic plants can maintain turgor. 

Thus, the correct answer is option D.

Which statement about the foreign genetic material in genetically modified (GM) crop plants or animals is false?

botany biotechnology and genetic engineering stds and infertility gm crops biotechnology

  1. It must be inserted again in each generation.

  2. It alters the phenotype of the GM plant or animal.

  3. It may be subject to natural selection by weather, pests and diseases.

  4. It may be transferred to related non-crop plants or animals.

Show answer
Correct Option: A
Explanation:

A genetically modified organism (GMO) is any organism whose genetic material has been altered using genetic engineering techniques. Genetic modification involves the mutation, insertion, or deletion of genes. Inserted genes usually come from a different species in a form of horizontal gene-transfer. Hence, the genetic material need not be inserted again in each generation.

Which one of the following is used in the manufacture of alcohol?

biology biotechnology and genetic engineering stds and infertility gm crops biotechnology

  1. Bacteria

  2. Water moulds

  3. Yeasts

  4. Slime moulds

Show answer
Correct Option: C
Explanation:

Alcoholic fermentation occurs in the production of alcoholic beverages and ethanol fuel, and in the rising of bread dough. Because yeasts perform this conversion in the absence of oxygen, alcoholic fermentation is considered an anaerobic process.

Alcoholic beverages are obtained with the help of

biology biotechnology and genetic engineering stds and infertility gm crops biotechnology

  1. Penicillium

  2. Yeast

  3. Blue-green algae

  4. None of the above

Show answer
Correct Option: B
Explanation:

Fermentation is a metabolic process that converts sugar to acids, gases and/or alcohol. It occurs in yeast and bacteria. Fermentation has been used by humans for the production of food and beverages as well as for producing alcoholic beverages such as wine and beer.

Which of the following is used in the production of leavened bread?

biology biotechnology and genetic engineering stds and infertility gm crops biotechnology

  1. Aspergillus

  2. Rhizopus

  3. Saccharomyces

  4. None of the above

Show answer
Correct Option: C
Explanation:

The selected strains of Saccharomyces cerevisiae, used in baking industry to bring about desired changes in flavour and texture of the baked products, are sold as baker's yeast. These yeasts have ability to ferment the sugar in the dough. The carbon dioxide produced during fermentation is responsible for the leavening (i,e., raising of the dough). Both CO$ _2$ and alcohol escape during baking so that the bread and other baked products become porous and soft.

Thus, the correct answer is option C.

The microorganism useful for fermentation of industrial production of beer is

biology biotechnology and genetic engineering stds and infertility gm crops biotechnology

  1. Streptomyces olivaceous

  2. Aspergillus niger

  3. Penicillium notatum

  4. Saccharomyces cerevisiae

Show answer
Correct Option: D
Explanation:

Yeasts are the main producers of wine and beer. In that the most important and high yielding strain is the saccharomyces cerevisiae. They ferment the sugars that comes the grapes and barley. 

Streptomyces olivaceous is used in the production of antibiotics. 
Aspergillus niger is used in the production of organic acids like the citric acid 
Pencillium notatum is used in the production of penicillin.
Hence, the correct answer is option D.


The utility of fungi for steroid conversion was demonstrated by

biology biotechnology and genetic engineering stds and infertility gm crops biotechnology

  1. Kohler and Milstein

  2. Murray and Peterson

  3. Kornberg and Miller

  4. Waksman and Monad

Show answer
Correct Option: B
Explanation:

Murray and Peterson demonstrated the utility of fungi for steroid conversion by using the Rhizopus stolonifer. Whereas the technique for development of monoclonal antibody was demonstrated by Kohler and Milstein. Waksman and Monad demonstrate the synthesis of streptomycin antibody from streptomyces species. Kornberg and Miller are known for the purification of the DNA polymerase 1 enzyme. Thus, the correct answer is option B.