A human female with only one X chromosome is said to have a condition called
A. X chromosome inactivation.
B. Angelman syndrome.
C. Turner syndrome.
D. Klinefelter syndrome.
E. Down syndrome.
C. Turner syndrome.
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Which group of eukaryotes LACK alveoli?
A) apicomplexans B) ciliates C) dinoflagellates D) oomycetes
You excavate a fossil of a small reptile during a paleontology field trip. It has the following characteristics: skull with a pair of dorsal temporal openings and a pair of lateral temporal openings; bipedal with legs positioned directly under the pelvic girdle. Dating with radioisotopes shows that the specimen lived 100 million year ago (MYA). You conclude that the specimen belongs to which reptilian group (be specific as possible)?
A. anapsid B. synapsid C. diapsid D. archosaur E. dinosaur 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 reptile skulls and dinosaur adaptations? 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?
Why was it necessary to culture E. coli for multiple generations in the 14N-rich medium to rule out the dispersive model?
a. Nitrogen is frequently lost by cells during meiosis, so multiple generations were required to ensure that residual-free 15N in the cytoplasm was replaced by 14N from the new medium. b. Multiple generations were required to ensure that the samples did not contain significant quantities of DNA from other organisms, which would confound the analysis of E. coli DNA. c. After only a single generation, it was expected that the DNA extracted from E. coli would contain equal proportions of 15N and 14N in both the semi-conservative and dispersive models. d. Multiple generations of replication in the 14N-rich medium were required to rule out the possibility that the changes to the DNA mass were not the result of inevitable statistical noise.
When fluorescently labeled oligonucleotides that are known to be specific to the microbe of interest are used to label natural samples, the technique is known as ________.
A. fluorescent in situ hybridization B. gel electrophoresis C. epifluorescence microscopy D. polymerase chain reaction