Which of the following likely evolved from photosynthetic cyanobacteria?
a. Mitochondria
b. Endosymbiotes
c. Anaerobic prokaryotes
d. Plastids
d. Plastids
Plastids likely evolved from photosynthetic cyanobacteria that were engulfed by other cells through endosymbiosis. Like mitochondria, they contain circular genomes and divide in a way that is similar to that of prokaryotes.
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A patient has come to you for a second opinion. "I have these mysterious lumps in my right armpit," he says, "The other doctor says we may have to remove them. What do you think?" You notice red scratches on the patient's right arm. "You must have a new kitten. Cat scratch disease, from the bacterium Bartonella ," you say, "And we certainly won't remove those lumps, they are really important! Those are your..."
A. "thymus glands, where naive B and T cells encounter antigens and become activated." B. "lymph nodes, where T-cell receptor genes are rearranged as T cells mature." C. "lymph nodes, where naive B and T cells encounter antigens and become activated." D. "spleen, where hematopoietic stem cells produce lymphoid and myeloid progenitors." 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 composition of tissue in the region of the armpit? 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?
Single-celled heterotrophic protists are commonly referred to as:
1.dinoflagellates 2.euglenoids 3.protozoans 4.diatoms
Photosynthesis in the ocean takes place mostly in the mesopelagic zone
Indicate whether the statement is true or false
All northern elephant seals come from a very small genetic pool. This is because in the 1890s a large number of them were very quickly killed until their population size was reduced to only about 20 individuals. Though their population has since increased to over 30,000 individuals, all their genes have come from those 20 individuals. Which of the following population genetic concepts does this example represent?
a) genetic drift b) evolution c) the Hardy-Weinberg equilibrium d) the founder effect e) the bottleneck effect