Molecules of extrachromosomal DNA in bacteria are known as
a) Golgi complexes
b) lysosomes.
c) plasmids.
d) ribosomes.
Ans: c) plasmids.
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Rabbits introduced to Australia overpopulated because in their new habitat, ____
a. people rarely hunted them b. they had no natural diseases c. they had no natural predators d. their food supply was larger e. there were few herbivorous competitors
In 1999, researchers found that they could create hybrid embryos between two species of sea urchin that had been separated for 10 million years. By treating eggs to remove the jelly coat, the sperm of the other species was able to fertilize. What step of the fertilization process is normally blocked, preventing hybridization between these species?
A. Sperm penetration B. Membrane fusion C. Egg activation D. Nuclear fusion Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about fertilization? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The figure below illustrates a __________ reaction
that produces a __________. a. condensation; hydroxyls; polymer b. condensation; water molecule c. cleavage; water molecules; monomer d. rearrangement; water molecules; polymer e. rearrangement; hydrogen ions; polymer
Small fish often follow large turtles in the open ocean, taking advantage of the turtle as a place to hide. This interaction would best be classified as
a) amphibianism b) parasitism c) predation d) commensalism e) mutualism