The skin of sharks is covered with scales called:
a. placoid.
b. cycloid.
c. ctenoid.
d. ganoid.
e. circular.
A
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Answer the following statement(s) true (T) or false (F)
1. In seed plants the entire male gametophyte is transported to the female. 2. Comparisons of DNA sequences have revealed that glomeromycetes are not in the same clade as the zygomycetes. 3. Recent phylogenetic analysis has provided evidence to justify classifying microsporidians as fungi. 4. Zygospores are used to resist harsh conditions. 5. The side to side thrashing of a nematode is accomplished by contraction of its circular muscles.
Aerobic exercise improves endurance by
a. increasing the number of muscle fibers. b. increasing the mass of each muscle fiber. c. causing more glycogen to be stored in each muscle fiber. d. increasing the number of mitochondria in each muscle fiber. e. doing all of these.
Silencing of selected genes is often done using RNA interference (RNAi). Which of the following questions would NOT be answered with this process?
A) What is the function of gene 432 in a particular species of annelid? B) What will happen in a particular insect's digestion if gene 173 is not able to be translated? C) Is gene HA292 expressed in individuals for a disorder in humans? D) Will the disabling of this gene in Drosophila and in a mouse cause similar results?
Consider a pond on your college campus. All of the organisms that live in the pond, including bacteria, protozoa, algae, plants and animals, represent a/an
A. population. B. niche. C. community. D. habitat. E. ecosystem.