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