How are heterokonts characterized?
a. by having two types of nuclei
b. by having two different flagella
c. by having cell walls of silica
d. by having cells walls of chitin
Ans: b. by having two different flagella
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Answer the following statements true (T) or false (F)
1. Thermoreceptors are only located in the skin on the outside of the body. 2. Processing of visual information occurs within the eye itself and before action potentials are sent via the optic nerve to the visual cortex. 3. Rods and cones make direct contact with ganglion cells within the vertebrate retina. 4. Rods and cones, like most sensory receptors, depolarize on receiving a stimulus. 5. Our senses of taste and smell are enhanced when we are hungry.
What process is targeted by the antibiotic streptomycin?
What will be an ideal response?
Natural selection acts most directly on:
a. populations. b. communities
c. ecosystems. d. the biosphere. e. K-selected organisms.
The largest mass extinction event of all time occurred at the end of the
A) Mesozoic era. B) Pleistocene epoch. C) Cambrian period. D) Permian period. E) Cretaceous period.