Biochemistry-I MCQs | BIO202 MCQs | Set 9

MCQs (Multiple Choice Questions)

1)    The position of any __________ in fatty acids are specified relative to the carboxyl carbon by superscript numbers following `\Delta`(delta).

    a)        Hydrogen atom

    b)        double bonds

    c)        Carbon atom

    d)        R-group

Correct Answer: 

The correct answer is  'b'.

Explanation:

The position of double bonds in fatty acids is specified relative to the carboxyl carbon by superscript numbers following Δ (delta). These numbers indicate the position of the double bonds along the carbon chain of the fatty acid.

______________________________

2)    OxyHemoglobin Dissociation Curve Bohr effect decreased affinity of hemoglobin _______ gas caused by an increase of carbon dioxide pH etc.

    a)        Oxygen

    b)       Ozone

    c)        Carbon dioxide

    d)       Nitrogen

Correct Answer:

The correct answer is  'a'.

Explanation:

The Bohr effect describes how factors such as an increase in carbon dioxide (which leads to a decrease in blood pH) can decrease the affinity of hemoglobin for oxygen. This means that when carbon dioxide levels are higher (such as in metabolically active tissues), hemoglobin is less likely to hold onto oxygen, making it more readily available for oxygen release to the surrounding tissues.

______________________________

Download Virtual University Handouts

3)    Fatty acids are classified on the basis of Hydrocarbon Chain Length include

    a)       Medium Chain Fatty Acids(6-12 C)

    b)       Short Chain Fatty Acids(6-12 C)

    c)       Long Chain Fatty Acids(6-12 C)

    d)       All of above

Correct Answer: 

The correct answer is  'd'.

Explanation:

Fatty acids are classified on the basis of their hydrocarbon chain length into three main groups:

• Short-chain fatty acids (SCFAs) have 4-6 carbon atoms.
• Medium-chain fatty acids (MCFAs) have 6-12 carbon atoms.
• Long-chain fatty acids (LCFAs) have 13-21 carbon atoms.

SCFAs are typically produced by the fermentation of dietary fiber in the colon. They have a number of beneficial effects on health, including reducing inflammation and improving gut barrier function.

MCFAs are more easily digested and absorbed than LCFAs. They are often used in weight loss supplements because they can increase metabolism and promote fat burning.

LCFAs are the most common type of fatty acid found in foods. They are a good source of energy and can also be used to build cell membranes and other important molecules.

However, it is important to note that not all LCFAs are created equal. Saturated LCFAs have been linked to an increased risk of heart disease and other chronic diseases, while unsaturated LCFAs, such as those found in olive oil and fish oil, have been shown to have health benefit.

______________________________

4)    The two ends of the polypeptide chain are known as the ____ and _____ terminus.

    a)        C, N

    b)        R, S

    c)        `\alph` , `\beta`

    d)       D, L

Correct Answer: 

The correct answer is  'a'.

Explanation:

The two ends of a polypeptide chain are known as the C-terminus and N-terminus. The N-terminus is the end with the free amino group (NH2), and the C-terminus is the end with the free carboxyl group (COOH).

______________________________

5)    Approximately how many hemoglobin molecules are there in each red blood cell?

    a)        300 million

    b)        50 million

    c)         5 million

    d)        30 million

Correct Answer: 

The correct answer is  'a'.

Explanation:

Approximately 300 million hemoglobin molecules are present in each red blood cell. Hemoglobin is a crucial protein in red blood cells responsible for binding and transporting oxygen.

______________________________

6)     Myoglobin can bind to one Oxygen molecule because it contains only 1 heme group.

    a)      False

    b)      True

Correct Answer: 

The correct answer is  'b'.

Explanation:

Myoglobin can bind to one oxygen molecule because it contains only one heme group. Heme is the iron-containing prosthetic group that allows myoglobin and hemoglobin to bind and transport oxygen. Myoglobin's primary function is to store oxygen in muscle tissue for use during periods of high oxygen demand, and it has a higher affinity for oxygen compared to hemoglobin.

______________________________

7)    Which of the following is positively charged at physiological pH?

    a)       Aspartate

    b)       Glutamate

    c)        Tyrosine

    d)       Arginine

Correct Answer: 

The correct answer is  'd'.

Explanation:

Arginine is positively charged at physiological pH due to its guanidinium group, which can accept and donate protons. Aspartate, glutamate, and tyrosine are negatively charged or neutral at physiological pH.

______________________________

All Virtual University Quiz

8)    Lauric acid is the saturated fatty acid having _____ carbon atom chain.

    a)        15

    b)        14

    c)        12

    d)       13

Correct Answer: 

The correct answer is  'c'.

Explanation:

Lauric acid is a saturated fatty acid with a 12-carbon atom chain. 

______________________________

9)     How many amino acids in the `\beta` chains of hemoglobin?

    a)        141

    b)        146

    c)         140

    d)        435

Correct Answer: 

The correct answer is  'b'.

Explanation

The β chains of hemoglobin consist of 146 amino acids. Hemoglobin is composed of four protein subunits, two α chains, and two β chains. Each β chain is made up of 146 amino acids, for a total of 292 amino acids in the β chains of hemoglobin.

______________________________

10)   Margarines are vegetable ______.

    a)        Oils

    b)        Wax

    c)        Carbogydrate

    d)       Protein

Correct Answer: 

The correct answer is  'a'.

Explanation:

Margarines are vegetable oils that have been partially hydrogenated to give them a solid or semi-solid consistency at room temperature. They are used as spreads and cooking fats.

______________________________