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WorksheetsMacromolecules and Properties of Water
Total questions: 15
Worksheet time: 10mins
Coiling & folding of a polypeptide chain of secondary structure of protein are the result of (a) bond.
(a) is a molecule that contains two functional groups; one having positive charge and the other one having negative charge in solution of pH 7.
Steroid molecules do not contain fatty acids.
True
False
Pyrimidines have a single six-membered ring.
True
False
Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature?
water's change in density when it condenses
water's ability to dissolve molecules in the air
the release of heat by the formation of hydrogen bonds
the absorption of heat by the breaking of hydrogen bond
The diagram provides some information concerning proteins.
Which of the following represents A?
sequence of ATP molecules
sequence of amino acids
sequence of simple sugars
sequence of starch molecules
The structures that forms the main component of the exoskeleton of arthropods and certain fungal cell wall is
cutin
chitin
murein
cellulose
Choose the correct match regarding functional groups.
- OH : thiol group
- COOH : methyl group
- C=O : carbonyl group
- CH3 : carboxyl group
Two monomers of nucleic acid are held together by
ester bond
peptide bond
nucleotide bond
phosphodiester bond
Which nucleic acid below might contain the triplet bases of CAT?
RNA
rRNA
DNA
tRNA
What is the correct chemical formula for water?
H2O
HO2
H2O2
2H1O
Why does ice float?
water expands when it freezes, making ice less dense than water
water compacts when it freezes, making ice more dense than water
hydrogen bonds in water push the ice to the surface
ice is afraid of water, and avoids it
cohesion
High specific heat capacity
Hydrogen bond is formed between
Two hydrogen atoms of a water molecule
Two hydrogen atoms of different water molecules
An oxygen atom and a hydrogen atom of different water molecules
An oxygen atom and a hydrogen atom of a same water molecules
The cohesiveness of water molecules is determined by
nonpolar covalent bond
hydrophobic interaction
hydrogen bond
ionic bond
