17
Q:

Suppose if we measure the time lapse between the two Sunsets by sitting in the beach , from this we can estimate 

A) The distance between the sun and earth B) The depth of the ocean
C) The radius of the earth D) The radius of the sun

Answer:   C) The radius of the earth



Explanation:
Subject: General Science
Q:

What are the sides of the dna ladder made of

A) nitrates and sugars B) sugars and hydrates
C) sugars and phosphates D) phosphates and nitrates
 
Answer & Explanation Answer: C) sugars and phosphates

Explanation:

DNA is a double-stranded molecule twisted into a helix. The shape of DNA is a double helix, which is like a twisted ladder. The sides of the ladder are made of alternating sugar and phosphate molecules. Deoxyribose, which is a pentose, and a phosphate group are the two molecules together form the two sides of the DNA. The rungs of the ladder are pairs of 4 types of nitrogen bases.

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2 9
Q:

Which of these provides your body with energy?

A) Carbohydrates B) Fats
C) Vitamins D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

Nutrients are the substances in food that provide the raw materials and energy the body needs to carry out all its essential processes.

There are six groups of nutrients:

1. Carbohydrates.

2. Fats.

3. Proteins.

4. Vitamins.

5. Minerals.

6. Water.

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1 20
Q:

What occurs during the digestion of protein?

A) Specific hormones breakdown proteins into simple sugars B) Specific enzymes breakdown proteins into simple sugars
C) Specific hormones breakdown proteins into complex starches D) Specific enzymes breakdown proteins into amino acids
 
Answer & Explanation Answer: D) Specific enzymes breakdown proteins into amino acids

Explanation:

Protein digestion occurs in the stomach and duodenum in which 3 main enzymes:

 

1. Pepsin secreted by the stomach 

2. Trypsin and

3. Chymotrypsin secreted by the pancreas

 

Break down food proteins into polypeptides that are then broken down by various exopeptidases and dipeptidases into amino acids.

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0 18
Q:

Valve between the left ventricle and Aorta?

A) Pulmonic valve B) Tricuspid valve
C) Aortic valve D) Mitral valve
 
Answer & Explanation Answer: C) Aortic valve

Explanation:

The Aortic valve - located between the left ventricle and the aorta

The Mitral valve - located between the left atrium and left ventricle

The Tricuspid valve - located between the right atrium and the right ventricle (and) 

The Pulmonary (pulmonic) valve - located between the right ventricle and the pulmonary artery.

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0 18
Q:

The term metabolism is best defined as

A) the number of calories it takes to keep from shivering on a cold day B) biochemical reactions involved in building cell molecules or breaking down molecules for energy
C) the length of time it takes to digest and absorb fats D) a measure of carbohydrate utilization, typically involving measurement of calories
 
Answer & Explanation Answer: B) biochemical reactions involved in building cell molecules or breaking down molecules for energy

Explanation:

Metabolism (from Greek: μεταβολή metabolē, "change") is the set of life-sustaining chemical transformations within the cells of organisms. The three main purposes of metabolism are the conversion of food/fuel to energy to run cellular processes, the conversion of food/fuel to building blocks for proteins, lipids, nucleic acids, and some carbohydrates, and the elimination of nitrogenous wastes.


In brief, the chemical processes that occur within a living organism in order to maintain life is called metabolism.

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1 37
Q:

Cobalt 60 is used for cancer treatment it emmits which rays?

A) Alpha B) Beta
C) Gamma D) X rays
 
Answer & Explanation Answer: C) Gamma

Explanation:

Cobalt therapy or cobalt-60 therapy is the medical use of gamma rays from the radioisotope cobalt-60 to treat conditions such as cancer.

 

Cobalt 60 is a synthetic radioactive isotope of cobalt with a half-life of 5.2714 years. It is produced artificially in nuclear reactors.

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1 56
Q:

Water is a compound because it?

A) it contains two different elements joined by chemical bond B) it contains hydrogen & oxygen
C) it exists as solid, liquid or gas D) it cannot be split up into simpler substances by chemicals means
 
Answer & Explanation Answer: A) it contains two different elements joined by chemical bond

Explanation:

We know that All compounds are molecules, but not all molecules are compounds.

Water is a molecule because it is made from atoms that have been chemically combined. It is also a compound because the atoms that make water are not all the same - some are oxygen and some are hydrogen.

 

Hence, Water is a molecule and a compound.

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0 44
Q:

The term hierarchy refers to

A) a team in which everyone is equal and has to pull his or her own weight B) a power structure in which each member knows his or her own place
C) a situation in which higher species such as men will always be in control of lower species such as animals D) a condition in which the weak must die so the strong can survive
 
Answer & Explanation Answer: B) a power structure in which each member knows his or her own place

Explanation:

Hierarchy is a system of ranking in which members of a particular society are ranked in an ascending order depending on various factors.

 

Hence, the term hierarchy refers to a power structure in which each member knows his or her own place.

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