Tag: biology

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Multiple choice biology food for health fats fats and their test different nutrients in food

Which of the following plays a key role in absorption and distribution of fats?

  1. Lacteals

  2. Villi

  3. Secretin

  4. Segmentation movements
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Meats, dairy products, seeds, nuts and oils contain dietary fat which needs to be broken down to be absorbed by the system. While the bile contains bile salts that emulsifies and pancreatic lipase acts to break lipids, to be absorbed in the blood stream this goes through further breakdown process in the small intestine where lacteals found in the villi of the intestinal wall help the lipids to pass through the  lymphatic system.

Therefore, the correct answer is option A.

Multiple choice biology food for health fats fats and their test different nutrients in food

Which of the following plays a key role in absorption and distribution of fats?

  1. Lacteals

  2. Villi

  3. Secretin

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

Lipids are fat-like molecule that cannot dissolve in water. When these reach the small intestine, the enzymes present there responsible for fat digestion acts on it. The pancreatic lipase breaks lipids down, resulting in free fatty acids and monoglycerides. Further, these are resynthesized into triglycerides which enter the lymphatic capillaries and lacteals present as the finger-like projections of the villi these acts on the lipids so as to be absorbed before they enter the bloodstream. 

Multiple choice biology food for health fats fats and their test different nutrients in food

Which of the following is rich in all the three foods, i.e., carbohydrates, proteins and fats?

  1. Rice grains

  2. Soybean seeds

  3. Mango fruit

  4. Cabbage leaves
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Soybean seeds have 40% protein content and 20% of oil which accounts for 60% weight of dry soybeans. The remainder 35% is carbohydrate. With the highest protein content among plant products, 100g serving of soybean consists of 17g protein, 1g of saturated fat, 10g of carbohydrate and 6g of fibre. 

Multiple choice biology food for health fats fats and their test different nutrients in food

A gram of butter provides more energy than a gram of sugar because

  1. Butter is digested slowly

  2. Butter has more carbon-hydrogen bonds

  3. Butter is more completely absorbed

  4. Butter contains more ATP
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A gram of butter provides more energy than a gram of sugar because butter has more carbon-hydrogen bonds.

The carbohydrates are the compounds which provide energy to living cells. They are compounds of carbon, hydrogen and oxygen with a ratio of two hydrogens for every oxygen atom. The carbohydrates we use as foods have their origin in the photosynthesis of plants. They take the form of sugars, starches, and cellulose.

Multiple choice biology food for health fats fats and their test different nutrients in food

A gram of butter provides more energy than a gram of sugar because

  1. Butter is an animal product.

  2. Butter has more carbon-hydrogen bonds.

  3. Butter is more completely absorbed.

  4. Butter contains more ATP.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fat contains 9 kcal per gram, whereas carbohydrates and protein only contain 4 kcal per gram. 

Triglycerides or fats are composed of one molecule of glycerol and joined via ester bonds with three molecules of fatty acids. Fatty acids are long chains of carbon and hydrogen usually between 14-24 carbons long. Due to the abundance of C and H, fatty acids are very hydrophobic and are not very soluble in water. 
Fatty acids come in two major types, saturated and unsaturated. Saturated means that they have no double bonds. Unsaturated means that it contains double bonds. Generally, saturated fats (butter) have a high melting point so that they are a solid at room temperature. Unsaturated fats have a lower melting point and are a liquid at room temperature. Margarine is made by hydrogenating (adding H) to unsaturated vegetable oils increasing the amount of saturation and thus, the melting point (so it will be a solid). 

Multiple choice biology diversity in living things and their classification diversity in plants types of nutrition in plants different modes of nutrition in plants

Which of the following come under the category of plant materials?

  1. Stem

  2. Leaves

  3. Gourds

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plant materials include a wide and varied group of plant parts from many species. General categories of plant materials include grasses, rushes, barks, woods, gourds, stems, roots, seeds, and leaves. These materials can be used to construct baskets, netting, cordage, and even fabrics. Common production methods include felting, knitting, knotting, coiling, plaiting, and weaving. 

So, the correct answer is 'All of the above'.

Multiple choice biology diversity in living things and their classification diversity in plants types of nutrition in plants different modes of nutrition in plants

In which plants stem are modified to store food and also act as organ of perennation to tide over conditions unfavourable for growth?

  1. Turmeric and Cucumber

  2. Chrysanthemum and Ginger

  3. Turmeric and Potato

  4. Euphorbia and Sweet Potato
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Stems can be modified to store food and survive unfavorable conditions as perennating organs, common examples being underground stem modifications like tubers (potato) and rhizomes (turmeric). Chrysanthemum and ginger also use underground stems, but potato and turmeric are classic textbook examples of tuber and rhizome modifications respectively.

Multiple choice dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

The enzyme DNA polymerase was discovered by 

  1. Kornberg

  2. Okazaki

  3. Watson and Crick

  4. Stahl and Meselson

  5. Jacob and Monod
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Arthur Kornberg purified and characterized DNA polymerase from E. coli cells which is encoded by the polA gene. It catalyzes phosphoryl group transfer. The 3-hydroxyl group of the nucleotide at the 3' end of the growing strand serve as nucleophile for nucleophilic attack at the $\alpha$ phosphorus of the incoming deoxynucleoside triphosphate. Inorganic pyrophosphate is released in the reaction. 

Multiple choice dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

Which of the following enzyme is used to join DNA fragments?

  1. Terminase

  2. Endonuclease

  3. Ligase

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

DNA ligase is a specific type of enzyme, a ligase, that facilitates the joining of DNA strands together by catalyzing the formation of a phosphodiester bond. It plays a role in repairing single-strand breaks in duplex DNA in living organisms, but some forms may specifically repair double-strand breaks, i.e., a break in both complementary strands of DNA. Single-strand breaks are repaired by DNA ligase using the complementary strand of the double helix as a template, with DNA ligase creating the final phosphodiester bond to fully repair the DNA. DNA ligase has applications in both DNA repair and DNA replication.