Understanding the sequence in protein synthesis.

Which of the following illustrates the correct sequence of events in the synthesis of a protein molecule? DNA + RNA formation of a polypeptide in RNA Formation of polypeptide + RNA in RNA DNA RNA in RNA DNA + formation polypeptide DNA in RNA + RNA formation polypeptide In RNA formation of polypeptide DNA + RNA

Small size in living cells

The small size in living cells can best be attributed to which of the following factors: the small size of most molecules the large number of the cells that are necessary to form an organism the rare favorable surface-to-value ratio of smaller cells the short life spans of large animals

the cytoskeleton and cell motility

Because cytoplasmic vesicles are seen to move in both directions within an axon, can you conclude that some microtubules are oriented with their plus end facing the axon terminus and others oriented with the opposite polarity?

myosin action differs from that of kinesin

myosin action differs from that of kinesin in that one of the kinesin heads is always in contact with a microtubule, whereas both myosin heads become completely detached from the actin filament. How are these differences correlated with the two types of motor activities in which these proteins engage?

cytoplasmic membrane system

Autoradiography depends upon particles emitted from radioactive atoms striking a photographic emulsion that lies on top of the tissue section. When the emulsion is developed, the site where the particle struck the emulsion is developed, the site where the particle struck the emulsion appears as a silver grain, as in figure 8.3a. how do you think the thickness of the section might affect the resolution of the technique, that is the ability to locate the precise site in the cell where radioactivity is incorporated?