Q. No.Which of the following is an essential amino acid?
1. Phenylalanine
2. Aspartic acid
3. Glutamic acid
4. Serine
1. Phenylalanine
Why is cellulose so difficult for most animals to digest?
1. they don’t have the proper enzyme to break the bonds between subunits
2. cellulose is made up of chitin, which is indigestible
3. the bonds holding cellulose subunits together are extremely strong, stronger than in any other macromolecule
4. there are many hydrogen bonds holding the subunits together
Which statement regarding enzyme inhibition is correct?
1. Competitive inhibition occurs when a substrate competes with enzyme for binding to inhibitor protein
2. Competitive inhibition occurs when a substrate and the inhibitor compete for active site on the enzyme
3. Non-competitive inhibition of an enzyme can be overcome by adding a large amount of substrate
4. Non-competitive inhibitors often bind to the enzyme irreversibly
The structure that helps in cell wall formation, DNA replication and respiration in bacteria is :
1. Mesosome
2. Chromatophores
3. Pilus
4. Nucleoid
Cell membrane carbohydrates participate in
1. transporting substances between two protein layers
2. cell-to-cell recognition
3. attaching the membrane to cytoskeleton
4. cell adhesions
A molecule of ATP is structurally most similar to :
1. RNA nucleotide
2. DNA nucleotide
3. amino acid
4. fatty acid
The unique properties of each amino acid is determined by its particular :
1. R group
2. amino group
3. finds of peptide bond
4. number of bonds to other amino acids
In competitive inhibition, if the concentration of the substrate is increased :
1. the rate of the reaction is increased
2. the rate of the reaction is decreased
3. the rate of the reaction is not affected
4. the reaction direction is reversed
Which of the following distinguishes the prophase1 of meiosis from the prophase of mitosis?
1. homologous chromosomes pair up
2. spindle forms
3. nuclear membrane breaks down
4. chromosomes become visible
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