#1
Which biomolecule is the primary source of energy for living organisms?
Proteins
Carbohydrates
Lipids
Nucleic acids
#2
In glycolysis, glucose is broken down into which compound?
Pyruvate
Acetyl-CoA
Lactate
Ethanol
#3
Which of the following is a nitrogenous base found in RNA but not in DNA?
Adenine
Guanine
Uracil
Thymine
#4
What is the main function of hemoglobin in the human body?
Facilitate digestion
Transport oxygen
Synthesize vitamins
Maintain blood pH
#5
Which of the following is a structural polysaccharide found in the cell walls of plants?
Cellulose
Glycogen
Chitin
Starch
#6
What is the main function of enzymes in biochemical reactions?
To provide structural support
To store genetic information
To speed up chemical reactions
To transport ions
#7
Which of the following is a characteristic feature of saturated fatty acids?
Liquid at room temperature
Contain double bonds
Tend to be solid at room temperature
Found primarily in plants
#8
What is the function of ribosomes in cells?
Protein synthesis
DNA replication
Cellular respiration
Lipid synthesis
#9
Which of the following is a water-soluble vitamin?
Vitamin A
Vitamin D
Vitamin C
Vitamin K
#10
What is the primary function of the Golgi apparatus in eukaryotic cells?
Energy production
Protein synthesis
Transport of ions
Modification and packaging of proteins
#11
What is the primary structure of a protein?
Sequence of amino acids
Three-dimensional folding
Quaternary structure
Presence of disulfide bonds
#12
Which of the following is NOT a function of nucleic acids?
Storage of genetic information
Energy storage
Transmission of genetic information
Protein synthesis
#13
What is the role of ATP in cellular processes?
Energy storage
Structural support
Enzyme activation
Genetic information storage
#14
Which of the following is a function of the endoplasmic reticulum (ER) in eukaryotic cells?
Synthesis of ribosomal RNA
Modification and packaging of proteins
Generation of ATP
Storage of genetic material
#15
What is the role of coenzymes in enzymatic reactions?
Serve as structural components of enzymes
Facilitate electron transfer
Act as substrates in reactions
Provide mechanical support