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WorksheetsBiochem 3 B
Total questions: 87
Worksheet time: 2hrs 49mins
What type of bond links nucleotides together in a DNA strand?
Hydrogen bonds
Peptide bonds
Phosphodiester bonds
Ionic bonds
During DNA replication, which enzyme unwinds the DNA double helix?
DNA polymerase
RNA polymerase
DNA helicase
Ligase
What is the role of mRNA in the cell?
To carry genetic information from DNA to the ribosome
To transport amino acids to the ribosome
To act as a structural component of the ribosome
To catalyze biochemical reactions
Which of the following is the correct flow of genetic information?
RNA → DNA → Protein
DNA → Protein → RNA
DNA → RNA → Protein
Protein → RNA → DNA
In RNA, which base pairs with adenine?
Thymine
Uracil
Cytosine
Guanine
What is the function of tRNA in protein synthesis?
It carries amino acids to the ribosome
It transcribes DNA into mRNA
It forms the structural components of the ribosome
It unwinds DNA for transcription
Which enzyme is responsible for synthesizing RNA during transcription?
DNA polymerase
Ligase
RNA polymerase
DNA helicase
What are introns?
Coding regions of a gene
Non-coding regions that are removed during RNA processing
Enzymes involved in DNA replication
Regulatory proteins in the nucleus
Which process involves the conversion of mRNA into a protein?
Replication
Transcription
Translation
Transduction
What term describes the sequence of three nucleotides in mRNA that codes for an amino acid?
Anticodon
Codon
Exon
Nucleotide triplet
Which mutation involves a change in a single nucleotide?
Frameshift mutation
Missense mutation
Point mutation
Nonsense mutation
What happens during apoptosis?
Cell proliferation
Programmed cell death
DNA replication
Protein synthesis
Which molecule acts as the template during transcription?
RNA
DNA
tRNA
Protein
Which enzyme is responsible for proofreading during DNA replication?
DNA ligase
DNA helicase
DNA polymerase
RNA polymerase
What is a characteristic of cancer cells?
Controlled cell division
Loss of regulatory mechanisms and uncontrolled cell division
Normal apoptosis rates
Decreased metabolic activity
Which base is replaced in RNA that is present in DNA?
Thymine is replaced by cytosine
Thymine is replaced by uracil
Adenine is replaced by guanine
Cytosine is replaced by thymine
Which base is replaced in RNA that is present in DNA?
Thymine is replaced by cytosine
Thymine is replaced by uracil
Adenine is replaced by guanine
Cytosine is replaced by thymine
What is the primary function of the plasma membrane?
Which is the most abundant lipid in the plasma membrane?
(a)
What causes the formation of a lipid bilayer in cell membranes?
Which factor increases membrane fluidity?
What is the role of aquaporins in the plasma membrane?
Which structure describes the arrangement of proteins within the plasma membrane?
Which type of protein spans the entire plasma membrane?
What influences the permeability of the plasma membrane to ions and polar molecules?
What happens when the membrane is exposed to lower temperatures?
What process involves the transfer of molecules against a concentration gradient?
Which molecules can easily pass through the lipid bilayer?
(a)
What role does cholesterol play in the plasma membrane?
Which process does not require energy investment for molecules to cross the membrane?
Which lipid component is essential for cell communication?
(a)
What maintains the asymmetrical distribution of phospholipids in membranes?
(a)
How do small, polar molecules like water cross the plasma membrane?
Which type of fatty acid increases the fluidity of the membrane the most?
Saturated fatty acid
Unsaturated fatty acid
Trans fatty acid
Omega-3 fatty acid
What structural feature is critical for the function of transmembrane proteins?
Which type of transport moves solutes along their electrochemical gradient?
What is the effect of cholesterol on the permeability of the plasma membrane?
Which category of nutrients must be consumed in relatively large quantities?
(a)
What is the primary function of dietary fiber?
Which vitamin serves as a precursor for visual pigments in the eye?
(a)
Which vitamin is important for blood clotting?
(a)
What is the primary function of Vitamin C?
What is the basic building block of DNA and RNA?
(a)
In DNA, adenine pairs with which base?
(a)
Which of the following is true about RNA compared to DNA?
Which of the following describes the structure of DNA?
(a)
What type of bond links nucleotides together in a DNA strand?
(a)
During DNA replication, which enzyme unwinds the DNA double helix?
(a)
What is the role of mRNA in the cell?
Which of the following is the correct flow of genetic information?
In RNA, which base pairs with adenine?
(a)
What is the function of tRNA in protein synthesis?
Which enzyme is responsible for synthesizing RNA during transcription?
(a)
What are introns?
Which process involves the conversion of mRNA into a protein?
(a)
What term describes the sequence of three nucleotides in mRNA that codes for an amino acid?
(a)
Which mutation involves a change in a single nucleotide?
What happens during apoptosis?
Which molecule acts as the template during transcription?
(a)
Which enzyme is responsible for proofreading during DNA replication?
(a)
What is a characteristic of cancer cells?
Which base is replaced in RNA that is present in DNA?
What is the primary function of the plasma membrane?
To provide structural support
To act as a selective barrier for molecules
To produce energy for the cell
To store genetic information
Which is the most abundant lipid in the plasma membrane?
Cholesterol
Glycolipids
Phospholipids
Triglycerides
What causes the formation of a lipid bilayer in cell membranes?
Presence of cholesterol
Hydrophobic and hydrophilic nature of phospholipids
Presence of proteins
Action of enzymes
Which factor increases membrane fluidity?
Longer fatty acid chains
Presence of cholesterol
Unsaturated fatty acids with double bonds
High protein content
What is the role of aquaporins in the plasma membrane?
To transport ions
To facilitate passage of water
To stabilize membrane structure
Which structure describes the arrangement of proteins within the plasma membrane?
Static bilayer model
Fluid mosaic model
Layered protein model
Hydrophobic core model
Which type of protein spans the entire plasma membrane?
Peripheral protein
Lipid-linked protein
Transmembrane protein
Cytosolic protein
What influences the permeability of the plasma membrane to ions and polar molecules?
Cholesterol content
Presence of specific transport proteins
Flexibility of the membrane
Size of the membrane
What happens when the membrane is exposed to lower temperatures?
It becomes more fluid
It solidifies depending on lipid types
It thickens uniformly
It increases permeability
What process involves the transfer of molecules against a concentration gradient?
Passive diffusion
Facilitated diffusion
Active transport
Simple diffusion
Which molecules can easily pass through the lipid bilayer?
Ions
Small hydrophobic molecules
Large polar molecules
Proteins
What role does cholesterol play in the plasma membrane?
It increases fluidity
It decreases flexibility
It acts as a transport protein
It stores energy
Which process does not require energy investment for molecules to cross the membrane?
Active transport
Facilitated diffusion
Vesicular transport
Osmotic transport
Which lipid component is essential for cell communication?
Glycolipids
Phospholipids
Triglycerides
Steroids
What maintains the asymmetrical distribution of phospholipids in membranes?
Scramblases
Golgi apparatus with flippases
How do small, polar molecules like water cross the plasma membrane?
Through the lipid bilayer directly
Via channel proteins like aquaporins
Through active transport pumps
By endocytosis
Which type of fatty acid increases the fluidity of the membrane the most?
Saturated fatty acids
Polyunsaturated fatty acids
Monounsaturated fatty acids
Trans fatty acids
What structural feature is critical for the function of transmembrane proteins?
Hydrophilic side chains
Hydrophobic regions spanning the lipid bilayer
Large carbohydrate groups
Cytosolic anchoring domains
Which type of transport moves solutes along their electrochemical gradient?
Passive diffusion
Channel-mediated facilitated diffusion
Active transport
Osmosis
What is the effect of cholesterol on the permeability of the plasma membrane?
Increases permeability
Decreases permeability
No effect
Which category of nutrients must be consumed in relatively large quantities?
Micronutrients
Water
Macronutrients
Fiber
What is the primary function of dietary fiber?
To provide energy
To aid digestion of proteins
To add bulk and stimulate peristalsis
To increase vitamin absorption
Which vitamin serves as a precursor for visual pigments in the eye?
Vitamin A
Vitamin E
Vitamin K
Vitamin D
Which vitamin is important for blood clotting?
Vitamin A
Vitamin B12
Vitamin K
Vitamin C
What is the primary function of Vitamin C?
Enhancing vision
Collagen synthesis and antioxidant function
Bone mineralization
Blood sugar regulation
