Describe the difference between cohesion and adhesion, and how they, together, allow water to move upward in
plants.
What will be an ideal response?
ANSWER: Cohesion is the resistance of a molecules to separate from each other, where adhesion is the
ability of molecules to stick to surfaces. Cohesion in water is the resistance to separate due to
the hydrogen-bond lattice. Adhesion in water is the ability of hydrogen bonds to form with
charged and polar groups associated with surfaces. A water column in a plant is a result of
cohesion – water molecules being held together – and maintained by water adhering to the
walls of the water conducting tissue (xylem).
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Genetic variation in a population refers to which of the following?
A. multiple individuals breeding together B. multiple alleles within a gene pool C. multiple phenotypes with the same genotype D. multiple genes within a genome E. multiple offspring with advantageous mutations
Transduction is a form of recombination in bacteria that involves ________
A) fertility factors B) plasmids C) physical contact between the bacteria involved D) 5-bromouracil E) bacteriophages
How do we perceive the pitch of sounds?
A) The hammer, anvil, and stirrup vibrate at different speeds. B) Different parts of the basilar membrane vibrate in response to different frequencies of sound. C) Rods vibrate in response to high-frequency sounds and cones respond to low-frequency sounds. D) The tympanic membrane vibrates more strongly at high frequencies. E) The pinna swivels in different directions in response to sounds of different frequency.
When a virus enters a lysogenic phase, it means
A. the virus is integrated into the DNA of the host cell and is latent. B. the virus is bursting through the host cell membrane. C. the virus will remain in circulation and not continue infecting its host. D. the virus is starting biosynthesis of its nucleic acid. E. the number of viruses in the host is decreasing as the immune system becomes effective.