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WorksheetsB 3 Biochem & Cell Bio Test S25
Total questions: 22
Worksheet time: 14mins
Lipids are composed mainly of which of the following atoms?
Carbon, nitrogen and sulfur
Carbon and hydrogen
Hydrogen, oxygen, and nitrogen
Oxygen and nitrogen
When DNA replicates, each original strand of DNA serves as a template for a new strand. What type of replication is this?
Base-paired replication
Double helical replication
Semi-conservative replication
Anti-parallel replication
Complimentary base pairing between two DNA strands is due to the formation of:
Operon bonds
Ionic bonds
Phosphodiester bonds
Hydrogen bonds
Match each statement to the type of DNA to which it applies.
Linear, very long pieces of DNA with many thousands of genes
Double helix structure of repeating nucleotides
Contained in a nucleus
Long, circular DNA with several thousand genes
Made of four nitrogenous bases
Small, circular DNA floating in the cytoplasm
Transcription begins when RNA polymerase binds to which area on the DNA strand?
Promoter
5' cap
Poly(A) tail
Okazaki fragment
Which process occurs at structure W?
Packaging of molecules
DNA replication
Protein Synthesis
Aerobic respiration
Where does translation take place in prokaryotes?
At the vacuoles
At the lysosomes
At the ribosomes
In the nucleus
Which of the following is the primary component of proteins?
Acetic acids
Amino acids
Nucleotides
Antibodies
Which of the following is true of proteins with quaternary structure?
They only have one polypeptide chain
They contain all known amino acids
They can have catalytic subunits
They cannot be denatured
Why are enzymes necessary in living organisms?
Enzymes are the source of energy for most reactions.
Enzymes raise the activation energy required for a reaction to proceed.
Enzymes increase the rate of chemical reactions which would otherwise occur too slowly to sustain life.
Which of the following affects the rate of a chemical reaction?
All of these
Heat
Presence of a catalyst
Concentration
Many enzymes used in biotechnology applications occur naturally within the cell. Which of the following enzymes are involved in DNA replication?
Aminotransferase
Luciferase
Restriction Endonuclease
DNA Polymerase
In a density gradient centrifugation experiment, what property of cells determines their position in the gradient?
The pH of the surrounding medium.
The presence of chlorophyll in the cells.
The color of the cell membrane.
The buoyant density of the cells.
A solute is the dissolved matter in a solution.
true
false
Cellulose is an important raw material for textiles and a variety of other industries. Which of the following is a function of polysaccharides in the cell?
All of the above
Providing structure and energy storage within cells
Recognition of receptor proteins on other cells
Transporting molecules throughout the cell
What is the primary function of the cell membrane in all living cells?
To provide structural support to the cell.
To produce energy for the cell through photosynthesis.
To control the movement of substances into and out of the cell.
To store genetic information.
E. coli migrating towards a high concentration of glucose is known as:
Gravitaxis
Durotaxis
Chemotaxis
Phototaxis
Genomics involves the study of all of the following EXCEPT:
Identifying the function of the genes in the genome
Studying how DNA is replicated within the cell cycle
Studying gene expression under varying conditions or in different cell types
Comparing genomes between different organisms
Mapping the location of genes in the genome
Human males inherit an X chromosome and mitochondrial DNA from their mothers.
true
false
Which of the following is NOT an advantage of a human monoclonal antibody over a polyclonal antibody made in a mouse?
Human monoclonal antibodies are more consistent between batches due to their uniformity.
Human monoclonal antibodies can be produced indefinitely in cell culture using hybridoma technology.
Human monoclonal antibodies can bind to multiple different antigens, offering broad reactivity.
Human monoclonal antibodies bind to a single specific epitope, providing high specificity for diagnostic testing.
What role do lipid nanoparticles (LNPs) play in the delivery of mRNA-based therapeutics?
They serve as templates for mRNA replication.
They function as enzymes that synthesize mRNA.
They protect mRNA from degradation and facilitate cell entry through endocytosis.
They directly translate mRNA into therapeutic proteins.
Which of the following best describes the role of monoclonal antibodies (mAbs) in immunotherapy?
They directly inhibit the replication of viruses.
They bind to specific antigens marking those cells for destruction.
They replace damaged tissues in the body.
They increase the production of red blood cells.
