The esophagus and trachea are both open to the ________
A) pharynx
B) posterior oral cavity
C) posterior nasal cavity
D) larynx
A
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In the late 1800s, Louis Pasteur was searching for a vaccine for anthrax in livestock. One French veterinarian had a local reputation for being able to cure anthrax by applying oils and wrapping the animal in cloth to induce a fever. Pasteur also knew that some animals got well on their own when left untreated. Pasteur tested the effectiveness of the local veterinarian's methods by injecting four cattle with anthrax bacteria. He then directed the veterinarian to perform his procedures on two cattle. The other two cattle were left alone. One cow from each group died and the other one in each group survived. Pasteur dismissed the veterinarian's procedure as ineffective, but he also considered this to be a poor test. Why would he consider this to be a poor test?
What will be an ideal response?
To study the promoter of a gene, a researcher should use a cDNA library.
Answer the following statement true (T) or false (F)
What is the order of structures or spaces that a surgeon will pass through to operate on a human lung?
A. skin -> intercostal muscles -> parietal pleural membrane -> pleural cavity -> visceral pleural membrane -> lung tissue B. skin -> pleural cavity -> intercostal muscles -> visceral pleural membrane -> parietal pleural membrane -> lung tissue C. skin -> visceral pleural membrane -> intercostal muscles -> pleural cavity -> parietal pleural membrane -> lung tissue D. skin -> intercostal muscles -> visceral pleural membrane -> pleural cavity -> parietal pleural membrane -> lung tissue E. skin -> intercostal muscles -> pleural cavity -> parietal pleural membrane -> visceral pleural membrane -> lung tissue 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 lungs? 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?
EMS (ethylmethane sulfonate) is mutagenic because __________
A) it breaks phosphodiester bonds B) it adds alkyl groups to bases C) it forms cross-links between DNA strands D) it makes DNA more susceptible to radiation E) it causes chromosomal deletions