EASY
Earn 100

What are amphipathic lipids?

Important Questions on Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Which of the following amino acids is NOT involved in gluconeogenesis?
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Which one of the following pairs of molecules never forms a hydrogen bond between them?
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
A 25000 Da protein contains a single binding site for a molecule (ligand), whose molecular weight is 2500 Da. Assuming high affinity and physiologically irreversible binding the amount of the ligand required to occupy all the binding sites in 10 mg protein will be:
HARD
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Which one of the following techniques is used for the detection of proteins?
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
The Fischer presentation of D-glucose is given below

Question Image

The correct structure(s) of β-L- glucopyranose is(are)
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Phospholipids are formed by the esterification of:
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Optical activity of DNA is due to its:
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Identify the substances having glycosidic bond and peptide bond, respectively in their structure.
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
How many different proteins consisting of 100 amino acids can be formed from 20 different amino acids?
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Choose the CORRECT combination of statements given below related to cysteine residue in proteins.

i. Cysteine can be linked to tyrosine by S-O bond.

ii. Cysteine can be linked to another cysteine by S-S bond.

iii. Cysteine can complex with Zn2+.

iv. Cysteine can be linked to methionine by S-S bond
HARD
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Two tubes labelled 'P' and 'Q' contain foodstuff. Tube 'P' gave a positive test with Benedict's solution while tube 'Q' gave a positive test with nitric acid. Which of the following is correct?
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Which one of the following statements is wrong?
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Which of the following is not polymeric?
HARD
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
The activity of a certain protein is dependent on its phosphorylation. A mutation in its gene changed a single amino acid which affected the function of the molecule. Which amino acid change is most likely to account for this observation?
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Concanavalin A is:
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
The reaction of concentrated sulphuric acid with carbohydrates C12H22O11 is an example of
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.

Match the following

(a) Inhibitor of catalytic activity (i) Ricin
(b) Possess peptide bonds (ii) Malonate
(c) Cell wall material in fungi (iii) Chitin
(d) Secondary metabolite (iv) Collagen

Choose the correct option from the following

EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.
In a protein molecule various amino acids are linked together by:
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.>Organization for Matter and Energy Flow in Organisms - The sugar molecules thus formed contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules(such as proteins or DNA), used for example to form new cells.As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.

Read the following statements on lipids and find out the correct set of statements:

(a) Lecithin found in the plasma membrane is a glycolipid.

(b) Saturated fatty acids possess one or more C=C bonds.

(c) Gingelly oil has a lower melting point, and hence remains as oil in winter.

(d) Lipids are generally insoluble in water but soluble in some organic solvents.

(e) When a fatty acid is esterified with gIycerol, monoglycerides are formed.

Choose the correct answer from the options given below: