BIO130H1 Chapter Notes -Molecular Motor, Guanine, Ribulose

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12 Apr 2012

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BIO130H1 Full Course Notes

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*an atom often behaves as if it has a fixed radius. For more clarity atoms are represented schematically as line structures or ball stick models, however the space-filing model gives us a more accurate representation. The radius of the electron cloud at which strong repulsive forces prevent a closer. Approach of any second, non-bonded atom-the so-called van der waals radius. At slightly greater distances any two atoms will experience a weak attractive force aka van der waals attraction. As a result of these two forces , there is a distance at which repulsive and attractive. Forces precisely balance to produce an energy minimum in each atom"s interaction with an atom of a second, non-bonded element. *water is the most abundant substance in cells. Water accounts for about 70% of the cells body weight, and most intracellular. Hydrophilic: water loving, dissolve in water and are polar ions (carry a + or - charge).

Related Questions

Protein structures are displayed in several ways, including: spacefilling models, ball and stick models, stick models, backbone models (which show the n-calpha-c=o units) and the cartoon representation (which shows the secondary structures).

Choose the best representations for each and EXPLAIN why:

1) Channels, holes, or pockets in a protein.

2) Secondary structures present in a molecule.

3) Residues in the active site of an enzyme.

EXPLAIN your choice for each.

redbat231

please help with this question:

Part of a-helix contains the following sequence of amino acids: V I L Q K A Y R S C E F A

i) Consider the amino acid in bold, R. List the other amino acids it would interact with within the a-helix, how they would interact ( specifically) and if the interaction would be an attractive or repulsive force.

ii) How would the amino acid composition differ from the helix in the oval differ from the composition of the helix in the rectangle.

1. Prokaryotic cells are able to evolve very fast, which helps them to rapidly adapt to new food sources and develop resistance to antibiotics. Which of the options below lists the three main characteristics that support the rapid evolution of prokaryotic populations?

no organelles, cell wall, can exchange DNA

large population, rapid growth, can exchange DNA

aerobic, motile, rapid growth

microscopic, motile, anaerobic

The cytoskeleton provides support, structure, motility, and organization, and it forms tracks to direct organelle and vesicle transport. Which of the cytoskeletal elements listed below is the thickest?

none of the above (all the same thickness)

intermediate filaments

microtubules

actin filaments

What unit of length would you generally use to measure a typical plant or animal cell?

millimeters

nanometers

centimeters

micrometers

Which of the following are examples of isomers?

adenine and guanine

glycogen and cellulose

alanine and glycine

glucose and galactose

Which of the following factors do not influence the length of a covalent bond?

the attractive forces between negatively charged electrons and positively charged nuclei

the tendency of atoms to fill the outer electron shells

the repulsive forces between the positively charged nuclei

the minimization of repulsive forces between the two nuclei by the cloud of shared electrons

You wish to explore how mutations in specific genes affecting sugar metabolism might alter tooth development. Which organism is likely to provide the best model system for your studies.

E. coli

mice

horses

Arabidopsis