Why do the cells die when the ambient temperature drops to freezing?
a. because of the increased cellular signalling inside the cell
b. because of the inhibition of cell division
c. because of the inhibition of molecule transport across the cell membrane
d. because of the increased metabolic reactions inside the cell
Ans: c. because of the inhibition of molecule transport across the cell membrane
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All cases of paralytic polio acquired in the U.S. between 1980 and 1999 were caused by Sabin's polio vaccine
Indicate whether this statement is TRUE or FALSE.
Why are African honeybees of such a concern? a. They have a more powerful venom than other honeybees
b. They are more widespread than other honeybees. c. Hey are much bigger than other honeybees. d. They cannot be killed by regular pesticides. e. They sting more readily than other honeybees.
Answer the following statements true (T) or false (F)
1.Insects have compound eyes. 2.In humans, taste buds are most highly concentrated on the inside surface of the lips of the mouth. 3.Sensory adaptation occurs when perception of one sense declines due to repeated stimulation. 4.The rods and cones in the retina transduce light energy into action potentials, which can then travel to the brain for processing. 5.Rod cells allow us to see at night and provide black and white vision.
The statement "Natural selection should favor pathogens that strike an optimal balance between the costs and benefits of harming their hosts" describes ________
A) the coincidental evolution hypothesis B) the shortsighted evolution hypothesis C) the trade-off hypothesis D) the energy-balance hypothesis