Chemistry of Life
What is the main function of carbohydrates in cells?
Forming cellular membranes.
Storing genetic information.
Providing energy.
Catalyzing chemical reactions.
What is an organic compound that is made by the glands in the body and is used for long distance communication between cells?
Carbohydrates
Synapse
Hormones
Neurotransmitters
How would lipids most likely respond if there was a mutation that replaced all saturated fatty acids within phospholipid bilayers with unsaturated fatty acids?
Membranes could become overly rigid preventing proper functioning within extreme temperature ranges.
Liposomes self-assembling from these mutated phospholipids may enhance targeted drug delivery applications.
Membrane fluidity might increase excessively, potentially compromising barrier function and cellular communication mechanisms.
Transport proteins embedded within membranes might trigger accelerated signal transduction efficiencies.
Which type of point mutation would most likely have the least effect on the resulting protein's function when occurring in the middle of a gene sequence?
Missense mutation
Silent mutation
Frameshift mutation
Nonsense mutation
Which result indicates competitive inhibition in an enzyme-catalyzed reaction when increasing amounts of potential inhibitor are added?
Both Vmax and Km decrease proportionally with higher concentrations of inhibitor present.
Vmax remains constant while Km increases with additional inhibitor concentration.
Vmax increases but Km remains constant despite changes in inhibitor levels.
Km decreases, suggesting stronger affinity between enzyme and substrate at higher inhibitor levels.
What effect might a mutation that alters the tertiary structure of hemoglobin without affecting its primary structure have on oxygen transport and affinity?
Enhanced oxygen release due to stronger hemoglobin-oxygen binding.
A potential decrease in oxygen affinity, disrupting efficient oxygen transport to tissues.
Unchanged function due to primary structure conservation maintaining activity.
Increased flexibility allowing easier oxygen capture at low concentrations.
When considering the impact on protein functionality, what effect could be predicted if there is an alteration in mRNA leading to premature stop codons during translation?
Increased rate of transcription due to faster turnover of mRNA molecules within the nucleus.
Enhanced binding affinity between substrates and their corresponding enzymes after translation adjustment occurs naturally over time through selective evolutionary pressures.
Formation of truncated proteins that lack critical functional domains necessary for activity.
Improved stability and solubility for proteins as shortening removes potentially misfolded regions frequently associated with insoluble aggregates.

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In a population of beetles, what is an immediate outcome when a deleterious allele arises through mutation and is then acted upon by natural selection?
There is an increase in heterozygote advantage within the population.
The frequency of the deleterious allele decreases over time.
The rate of reproduction in individuals with this allele increases for compensation.
The allelic diversity within the population increases temporarily.
Given a pedigree where an affected female mates to an unaffected male and half their children are affected regardless of sex, what is likely the inheritance mode?
Mitochondrial inheritance pattern
Autosomal dominant with incomplete penetrance
X-linked dominant trait
Y-linked recessive gene expression
Considering cellular macromolecules, which scenario would most likely result in disrupted cell function due to changes in protein structure?
The substitution of a hydrophobic amino acid with a hydrophilic one in a transmembrane region.
The addition of a ubiquitin molecule to tag a protein for degradation via proteasomes.
The phosphorylation of an amino acid residue on an enzymatic allosteric site.
An increase in hydrogen bonding between R-groups on the surface of an enzyme's active site.