Cell Structure and Function
Which process primarily takes place in animal cell lysosomes?
Protein synthesis
Intracellular digestion
Photosynthesis
Cellular respiration
Which cellular structure is primarily responsible for the detoxification of harmful substances that enter a liver cell?
Golgi apparatus
Smooth endoplasmic reticulum
Rough endoplasmic reticulum
Lysosome
How can you test whether pH fluctuations inside lysosomes affect their degradative capabilities?
Manipulate intralysosomal pH with ionophores while monitoring breakdown rates of fluorescently tagged macromolecules inside lysosomes.
Measure cytosolic pH shifts upon addition of weak bases or acids while checking for accumulation of undigested material by flow cytometry.
Observe changes in lysosome size under varying external pH conditions using transmission electron microscopy (TEM).
Assess enzymatic activity profiles at different pH values outside isolated lysosomes via spectrophotometric assays.
What potential effect on microtubule dynamics might result from modifying tubulin subunits so they bind GTP irreversibly rather than hydrolyzing it?
Complete failure polymerize due lack essential energy input necessary construction
Depleted GTP pools slowing overall growth rate expanding microtubule networks
Premature disassembling preventing spindle assembly correctly orienting chromosomes
Stabilized microtubules resistant dismantling leading prolonged spindle fiber structures
Given that photosynthesis stores light energy as chemical potential energy, which process occurring within mitochondria is analogous in terms of transferring stored chemical potential back to kinetic?
Glycolysis splitting glucose molecules, releasing small bursts of kinetic heat.
Pyruvate decarboxylation creating acetyl-CoA for entry into the Krebs cycle.
The Krebs cycle turning citrate back into oxaloacetate while releasing CO₂.
Oxidative phosphorylation transforming ATP's stored chemical potential into mechanical work or heat.
Which of the following is responsible for protein synthesis in a cell?
Endoplasmic reticulum
Golgi apparatus
Ribosomes
Lysosomes
What is the main function of ribosomes found attached to the rough endoplasmic reticulum?
Production of lipid molecules for cell membranes
Synthesis of proteins destined for export from the cell
Breakdown of worn-out organelles
Generation of ATP through cellular respiration

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Which metabolic pathway allows plants to build sugars necessary for growth using atmospheric CO₂ during daylight hours?
Glycolysis
Calvin cycle
Lactic acid fermentation
Krebs Cycle
Which explanation best accounts for genetic diversity created through sexual reproduction?
Random fertilization between gametes increases chromosomal counts leading to diversity.
Crossover during mitosis maintains consistent genetic information across dividing cells preventing variation.
Mutations during mitosis generate diverse genetic profiles within an organism's body cells.
Cross over during meiosis creates new allele combinations that contribute to genetic variety.
What method could be used to determine if a newly identified endoplasmic reticulum (ER) enzyme is critical for lipid synthesis?
Inhibit the expression of the enzyme's gene using RNA interference (RNAi) and measure subsequent lipid levels within cells.
Tag the enzyme with fluorescent markers and track its location within live cells using confocal microscopy.
Overexpress the enzyme in cultured cells and monitor any changes in organelle morphology under an electron microscope.
Compare lipid composition between normal ER and isolated smooth ER lacking ribosomes through chromatography.