Why specifically trichloroacetic acid is being used to analyse chemical composition of tissues?

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.

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.

How many different proteins consisting of 100 amino acids can be formed from 20 different amino acids?

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?

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.

Match List-$\mathrm{I}$ with List-$\mathrm{II}$

List-$\mathrm{I}$ (Biological Molecules)		List-$\mathrm{II}$ (Biological functions)
(a)	Glycogen	(i)	Hormone
(b)	Globulin	(ii)	Biocatalyst
(c)	Steroids	(iii)	Antibody
(d)	Thrombin	(iv)	Storage product

Choose the correct answer from the options given below:

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?

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 ${\mathrm{Z}\mathrm{n}}^{2+}.$

iv. Cysteine can be linked to methionine by S-S bond

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?

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?

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.

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.

Which one of the following pairs of molecules never forms a hydrogen bond between them?

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.

A $25000 \mathrm{Da}$ protein contains a single binding site for a molecule (ligand), whose molecular weight is $2500 \mathrm{Da}$. Assuming high affinity and physiologically irreversible binding the amount of the ligand required to occupy all the binding sites in $10 \mathrm{mg}$ 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.

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.

Identify the substances having glycosidic bond and peptide bond, respectively in their structure.

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:

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



The correct structure(s) of $\mathrm{\beta }-\mathrm{L}-$ glucopyranose is(are)

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 are not secondary metabolites in plants?

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.

How are vitamins classified ? Name the vitamin responsible for the coagulation of blood.