The plastids of kelps and other brown algae arose through secondary endosymbiosis. What modern organisms are most closely related to the type of cell that eventually became these plastids?
A. cyanobacteria
B. Chlamydomonas (a single-celled green alga)
C. Trypanosoma (a kinetoplastid)
D. dinoflagellates
E. coccolithophorids
B. Chlamydomonas (a single-celled green alga)
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In some ciliate protozoa, the codons UAA and UAG encode glutamate, rather than acting as STOP codons. How does this compare to other species?
A. This is unusual – almost all species share the same “universal” genetic code. B. This is typical – every species has its own unique genetic code. C. This is not unusual – while most species have a similar genetic code, there are often variations for some of the amino acids. 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 the genetic code? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Of the processes involved in the long-term carbon cycle, which removes CO2 from the atmosphere?
A. chemical weathering B. volcanism C. respiration D. photosynthesis E. bacteria-based oxidation
In earthworms, what do the nerve cord, the setae, the circular muscles, and the metanephridia have in common?
A. They are serially repeated in the body segments of the body. B. They are all used in locomotion. C. They all play a role in excretion of waste from the body. D. They all play a role in the reproductive activities of the earthworm.
The clearing made by bacteriophages in a "lawn" of bacteria on an agar plate is called a ________
A) host range B) plaque C) lysogenic zone D) prophage E) clear zone