Which of the following statements is NOT true?
a. A lipid bilayer is characteristic of all
membranes.
b. Cellular organelles are associated with
membranes.
c. In a plasma membrane, a hydrophilic portion is
oriented to the outside of the cell.
d. Lipid molecules make the cell membrane
relatively impermeable to water-soluble
substances.
e. Even by using extremely high magnification, an
electron microscope cannot reveal the
substructure of cell membranes.
Answer: e
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At night, we see primarily black and white and shades of gray, except near lights where some color is still evident. This is outward evidence of what internal anatomy?
A. The retina has a circadian rhythm. B. The lens filters differentially the many wavelengths of light. C. Cones detect the color of an object, and are activated by bright light. D. There are more cones than rods and cones are very sensitive to light. E. The vitreous humor filters much light, and daytime intensity is necessary to get colored light through to the retina.
How can RNA be distinguished from DNA?
A) RNA does not contain a sugar. B) RNA lacks the base uracil. C) RNA is never found in the nucleus. D) RNA is single-stranded.
Which of the following statements regarding vectors is FALSE?
A. Vectors are usually autonomously replicating DNA molecules. B. A useful vector contains multiple restriction sites for insertion of DNA. C. Vectors are generally over 100,000 base pairs in size. D. Cloning vectors frequently contain sequences necessary for expression of inserted sequences. E. Cloning vectors include a "marker" to facilitate identification of cells containing them.
When water molecules "stick"to something that is not another water molecule, this is called
A. adhesion. B. water pressure. C. cohesion. D. root pressure. E. pneumatophores.