Chemistry of Life
In what way could a single nucleotide polymorphism (SNP) within a regulatory region upstream of a gene encoding for a receptor protein impact cellular communication?
It could lead to an increased degradation rate of mRNA transcripts, indirectly improving signal transduction efficiency.
The SNP might enhance receptor specificity, increasing communication with only certain signaling molecules.
Such SNP may trigger alternative splicing events that generate more diverse receptor isoforms leading to enhanced cell signaling pathways.
It may alter transcription factor binding sites, affecting receptor expression levels and disrupting signal reception.
How does an enzyme’s active site contribute to its specificity?
By increasing temperature during catalysis to promote substrate alignment.
By matching the precise shape and chemical environment required for substrate binding.
By forming covalent bonds with any available reactant molecule nearby.
By changing constantly to adapt to different types substrates it encounters.
How might a sudden decrease in water pH levels affect the structure of aquatic plant cellulose within an ecosystem?
It could increase the rate of photosynthesis, resulting in thicker cell walls and more robust plants.
It may disrupt hydrogen bonding, leading to altered cellulose structure and impaired plant growth.
Lower pH levels might lead to increased cellulose production, promoting faster growth in aquatic plants.
The decreased pH could enhance mineral absorption, improving the structural integrity of cellulose.
Which macromolecule acts as a catalyst in biological reactions?
Polysaccharides
Nucleic acids
Lipids
Proteins
Regarding polysaccharides, which statement accurately describes their structural variability?
They can either be linear or form rings with variable sizes.
They can vary based on their monosaccharide composition and branching patterns.
They interact through hydrophilic interactions.
They all serve primary energy storage roles in animals only.
A macromolecule has several chains containing carbon rings with one oxygen per ring. Which macromolecule must it be?
Protein
Lipid
Nucleic acid
Carbohydrate
What would be an immediate consequence if a mutation occurred that significantly altered the tertiary structure of hemoglobin?
The rate of glycolysis would increase.
Cell membrane receptor affinity could increase.
The oxygen-binding capacity could decrease.
The lipid bilayer fluidity might change.

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What are the monomer units used to build proteins called?
Amino acids
Nucleotides
Fatty acids
Monosaccharides
What type of biological macromolecule are enzymes classified as?
Nucleic acids
Proteins
Carbohydrates
Lipids
What is the primary role of lipids in cellular membranes?
Speed up metabolic reactions by lowering activation energy
Store genetic code for protein synthesis
Forming bilayers that separate cellular environments
Serve as recognition sites for cell-cell communication