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Description: biology
Number of Questions: 15
Created by:
Tags: Biology chemistry Macromolecules of Life Biomacromolecules Classification of Elements and Periodicity in Properties Kinematics: 2-D and 3-D Motion in a Plane
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Which of the following reactions is the most common type of catabolic reaction occurring in animal body?

  1. dehydration

  2. hydrolysis

  3. elimination

  4. glucogenesis

  5. condensation

Show answer
Correct Option: B
Explanation:

This process involves the breakdown of triglycerides, carbohydrates and proteins.

If a person undergoing continued starving has higher level of nitrogen in his urine, which of the following is one of the reasons for this condition?

  1. Glycogen breakdown in liver.

  2. Breakdown of structural proteins.

  3. Dissolution of adipose tissue.

  4. Excessive secretion of ADH.

  5. Development of tumor in pituitary gland.

Show answer
Correct Option: B
Explanation:

In the condition of prolonged fasting the structural proteins of the body gets consumed and proteins have large amount of nitrogen in them.

Proline, a non alpha amino acid cannot fit itno alpha helical structure. This lead to a bend in the peptide chain. What type of protein structure is then formed?

  1. Beta primary

  2. Beta secondary

  3. Alpha secondary

  4. Tertiary

  5. Quaternary

Show answer
Correct Option: B
Explanation:

Beta secondary structure is folded sheet form.

Silicon is a shiny lusterous substance at room temperature. It is brittle but is not a very good conductor of heat or electricity. What is the nature of silicon?

  1. It is a nonmetal.

  2. It is a metalliod.

  3. It is a metal.

  4. It is a halogen.

  5. It is a chalcogen.

Show answer
Correct Option: B
Explanation:

Yes, it is correct. Silicon is a metalloids  found along the stair-step line that distinguishes metals from non-metals.

Which of the following statements about fats is incorrect?

  1. Fats can be a cell structure.

  2. Fats can be component of hormones.

  3. Fats are a more efficient form of energy storage than the proteins.

  4. Fats are a less efficient form of energy storage than carbohydrate.

  5. Fats are a type of lipids.

Show answer
Correct Option: C
Explanation:

Fats are a more efficient form of energy storage than carbohydrates and proteins.

A particular sample of C contains 99% of 12C. The number of moles of 12C present in a 48.5 gram carbon sample is ________.

  1. 2

  2. 4

  3. 1

  4. 12

  5. 49.5

Show answer
Correct Option: B
Explanation:

Lets assume that 100% of the sample is 12C. As we know: moles = grams/molecular weight. This is approximately 4. The 1% that is not 12C is insignificant.

The periodic property that increases with increasing atomic number within a family is ________.

  1. electronegativity

  2. electron affinity

  3. atomic radius

  4. ionization energy

  5. metallic luster

Show answer
Correct Option: C
Explanation:

A family or group is a vertical column on the periodic table and atomic radius increases going down a column with the addition of a shell.

Which of the following molecules has the highest dipole moment?

  1. H2

  2. O2

  3. HF

  4. HBr

  5. HI

Show answer
Correct Option: C
Explanation:

Based upon periodic trends, H and F will have the greatest dipole moment.

Chitin, a polysaccharide cannot be digested by animals just like cellulose. But chitin possesses an acetyl-amino group at the second carbon unlike cellulose. What molecule is involved in the breaking of the beta-1,4-glycoside linkages of cellulose and chitin?

  1. Water

  2. Nitrogen

  3. Oxygen

  4. Alpha-1, 4- glycosidase

  5. Beta-1, 4- glycosidase

Show answer
Correct Option: A
Explanation:

Both alpha and beta linkages in polysaccharides are hydrolyzed by adding water.

A piece of paper flies upward for 6 km. At that time the wind is blowing at 10 km north and 8 km east. About how many km displacement has taken place from initial to final position?

  1. 7 km

  2. 10 km

  3. 14 km

  4. 20 km

  5. 40 km

Show answer
Correct Option: C
Explanation:

The paper will fly in three dimensional space. So there are three displacement vectors associated. The net displacement will be the vector sum of the three.The displacement from tip of the 6 km vector to the head of the 8 km vector is 10 kilometers. Further 10 km vector is perpendicular to the other 10 km vector. Applying the Pythagorean theorem on the two 10 km vectors will give approximate 14 km.

A snake entered a cave and crawled 100 m northwards. It turn 150° to the west and crawls 87 m straight. How far is the snake from his starting point at the opening of the cave? (Note: sin 30° = 0.50; cos 30° = 0.87).

  1. 25 m

  2. 50 m

  3. 75 m

  4. 100 m

  5. 150 m

Show answer
Correct Option: B
Explanation:

The snake actually moved in 30-60-90 triangle. The backward distance to the starting point is 100 sin30°. It is also possible to use the law of cosines: A2 = B2 + C2- 2BCcos(a).

An athlete runs on a circular track of circumference 1/2 km. What is his average velocity, if he runs 1 km in 4 minutes?

  1. 0 m/s

  2. 2 m/s

  3. 4.2 m/s

  4. 8.4 m/s

  5. 16.8 m/s

Show answer
Correct Option: A
Explanation:

As the athlete is running on a circular track of whatever km length, he will end where he started from. Thus his displacement will be zero, and it will be his velocity as these are vector quantities

The earth revolves around the sun, the center of solar system, at about 30 m/s. Is the earth in accelerated motion?

  1. No, as acceleration is a vector.

  2. No, as the net displacement is zero.

  3. Yes, as the speed is not constant.

  4. Yes, as the velocity is not constant.

  5. The data is insufficient.

Show answer
Correct Option: D
Explanation:

Acceleration is defined as the rate of change of velocity. Both acceleration and velocity are vector quantities. As the direction of the earth's motion is constantly changing, so is velocity changing and thus earth is in accelerated motion.

An aeroplane flies from Mumbai to New Delhi on a curved trajectory. What would be the trend associated with this curved trajectory?

  1. The displacement is less than it would be if the aeroplane moves in a straight line.

  2. The displacement is greater than it would be if the aeroplane moves in a straight line.

  3. The displacement is the same as it would be if the aeroplane moves in a straight line.

  4. The final displacement of the aeroplane is zero.

  5. The information is insufficient.

Show answer
Correct Option: C
Explanation:

Displacement depends on initial and final position, and it will be same as long as the initial and final points are same.

What is the correct order of decreasing order of ion size from left to right?

  1. 0 2-, F-, Na+, Mg2+

  2. Mg2+, Na+, F-, 0 2-

  3. Na+, Mg2+, 0 2-, F-

  4. Mg2+, Na+, 0 2-, F-

  5. Na+, Mg2+, F-, 0 2-

Show answer
Correct Option: E
Explanation:

These are isoelectronic species, which have same number of electrons on each ion.In an isoelectronic series of ions, the nuclear charge increases with increasing atomic number and draws the electrons inward with greater force. The ion with fewest protons produces the mildest attractive force on electrons and thus has the biggest size.

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