2785038
Descripción
Test por howcontrived, actualizado hace más de 1 año
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Creado por howcontrived
hace casi 9 años
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Pregunta 1
Pregunta
The organelles/structures responsible for the manufacture, folding, and modification of proteins.
Respuesta
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Ribosome
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Rough ER
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Smooth ER
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Golgi
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Nucleolus
Pregunta 2
Pregunta
When two amino acids form a peptide bond or two nucleotides form a phosphodiester bond, one molecule of ______________________________ is lost.
Respuesta
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Phosphate
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Hydrogen
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Water
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Nitrogen
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None of these
Pregunta 3
Pregunta
_______________________________ transport involves processes such as osmosis and diffusion.
Respuesta
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Passive
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Active
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Ligand-gated
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Voltage-gated
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None of these
Pregunta 4
Pregunta
Carbohydrates are stored long-term in plants in the form of ________________________.
Respuesta
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Proteoglycans
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Amylopectin
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Amylose
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Cellulose
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Glycogen
Pregunta 5
Pregunta
Which of the following molecules will readily cross the plasma membrane by simple diffusion?
Respuesta
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Na+
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Estrogen
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Oxygen
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Glucose
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Ethanol
Pregunta 6
Pregunta
In DNA, the nucleotide adenine forms ________ hydrogen bonds with _________.
Respuesta
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2, thymine
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2, guanine
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3, cytosine
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3, uracil
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2, uracil
Pregunta 7
Pregunta
Which of the following organelles/structures are typically only found in prokaryotes, not eukaryotes.
Respuesta
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Cell wall
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Glycocalyx
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Mitochondria
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Microtubules
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None of these
Pregunta 8
Pregunta
Hydrogen bonds contribute the the structure of which of the following?
Respuesta
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alpha-helix shape of peptides
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double-strandedness of DNA
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lattice-like crystal structure of ice
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tertiary structure of proteins
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none of these
Pregunta 9
Pregunta
If placed in a ___________________ solution, a red blood cell will swell and lyse.
Respuesta
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hypotonic
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isotonic
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hypertonic
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none of the above
Pregunta 10
Pregunta
Polyglutamine expansions, protein aggregation, and neuronal damage underlie the pathology of which disease(s)?
Respuesta
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Alzheimer's
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Huntington's
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Transmissible Spongiform Encephalopathies
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Cystic Fibrosis
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I-Cell
Pregunta 11
Pregunta
Which of the following molecules is polar? You will be given the molecule name or structure, but not both, in order to determine polarity.
Respuesta
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Water
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Methane
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None of these
Pregunta 12
Pregunta
What is a major role of the glycocalyx?
Respuesta
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Cell recognition
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Cell movement
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Cell division
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None of these
Pregunta 13
Pregunta
What is the difference between a peptide and a protein?
Respuesta
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Peptides are constructed in the N-to-C direction, whereas proteins are in the C-to-N direction.
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There are no differences between the two.
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A peptide is a single string of amino acids, whereas a protein may contain multiple peptides.
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Proteins can form peptides, but peptides cannot form proteins.
Pregunta 14
Pregunta
Why are saturated fats more solid than unsaturated?
Respuesta
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None of these
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Unsaturated fatty acids have a kink in their tail, which makes it harder to pack together resulting in decreased rigidity.
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Unsaturated fatty acids have a lower melting temperature.
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Unsaturated fatty acids have fewer hydrogens, thus they are not capable of forming as many hydrophobic forces as saturated fatty acids.
Pregunta 15
Pregunta
When in an aqueous environment amphipathic molecules have a tendency to ....
Respuesta
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form micelles and bilayers.
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aggregate into plaques.
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polymerize into larger macromolecules.
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None of these
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