The plasma membrane functions as a
a. selective barrier to the passage of molecules.
b. site for the uptake of macromolecules into the cell.
c. site for cell-cell interactions.
d. All of the above
Ans: d. All of the above
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The anticodon on the mRNA recognizes the codon on the tRNA
Indicate whether the statement is true or false
The nervous system can directly affect the activities of the digestive system locally through the collection of neurons within the walls along the gastointestinal tract. How might the brain exert its regulation of digestion from a distance?
_____ The sight, smell and taste of food can activate saliva production, stomach activity and digestion before it reaches the stomach. _____ The brain detects the stretching of the small intestines when food enters, and regulates the progress of chyme from the stomach into the intestine. _____ Muscular control of peristalsis resulting in mixing of food with digestive enzymes and moving food along the digestive tract. _____ Emotional stress or depression may alter appetite patterns.
The steps associated with viral replication include:i
assembly of viral proteins ii. attachment to the host cell iii. replication of viral genetic material Which of the following lists these steps in the correct order of occurrence?
a. i, ii, iii b. ii, iii, i c. iii, ii, i d. i, iii, ii
What is the fate of the electrons that interact with a specimen in an electron microscope?
a. They are reflected by the specimen. b. They are refracted by the specimen. c. They may be absorbed, reflected, or refracted by the specimen. d. They are absorbed by the specimen