Answer the following question given this paragraph: Polyprotic Acids and Bases As you learned in Chapter 4 "Reactions in Aqueous Solution", polyprotic acids such as H2SO4, H3PO4, and H2CO3 contain more than one ionizable proton, and the protons are lost in a stepwise manner. The fully protonated species is always the strongest acid because it is easier to remove a proton from a neutral molecule than from a negatively charged ion. Thus acid strength decreases with the loss of subsequent protons, and, correspondingly, the pKa increases. Consider H2SO4, for example: Figure 16.5. Q: What decreases with the loss of subsequent protons? Choices: - example strength - Movement strength - seawater strength - acid strength A:
acid strength
(Question)
Answer the following question given this paragraph: This bacterium, called Mycobacterium tuberculosis , causes the disease Tuberculosis (TB). These bacteria usually attack the lungs. If left untreated, the infection can be fatal. Many other illnesses, mild and severe, are also caused by certain types of bacteria. Q: What part of the body does the mycobacterium tuberculosis bacterium usually attack? Choices: - Pancreas - muscles - heart - lungs A:
(Answer)
lungs
Ques: Answer the following question given this paragraph: 17.4 Doppler Effect and Sonic Booms The characteristic sound of a motorcycle buzzing by is an example of the Doppler effect. The high-pitch scream shifts dramatically to a lower-pitch roar as the motorcycle passes by a stationary observer. The closer the motorcycle brushes by, the more abrupt the shift. The faster the motorcycle moves, the greater the shift. We also hear this characteristic shift in frequency for passing race cars, airplanes, and trains. It is so familiar that it is used to imply motion and children often mimic it in play. The Doppler effect is an alteration in the observed frequency of a sound due to motion of either the source or the observer. Although less familiar, this effect is easily noticed for a stationary source and moving observer. For example, if you ride a train past a stationary warning bell, you will hear the bell's frequency shift from high to low as you pass by. The actual change in frequency due to relative motion of source and observer is called a Doppler shift. The Doppler effect and Doppler shift are named for the Austrian physicist and mathematician Christian Johann Doppler (18031853), who did experiments with both moving sources and moving observers. Doppler, for example, had musicians play on a moving open train car and also play standing next to the train tracks as a train passed by. Their music was observed both on and off the train, and changes in frequency were measured. What causes the Doppler shift? Figure 17.14, Figure 17.15, and Figure 17.16 compare sound waves emitted by stationary and moving sources in a stationary air mass. Each disturbance spreads out spherically from the point where the sound was emitted. If the source is stationary, then all of the spheres representing the air compressions in the sound wave centered on the same. Q: The characteristic sound of a motorcycle buzzing by is an example of which effect? Choices: - warp effect - coreolis effect - polar effect - doppler effect A:
Ans: doppler effect
(Q).
Answer the following question given this paragraph: It was known that DNA is composed of nucleotides , each of which contains a nitrogen-containing base, a five-carbon sugar (deoxyribose), and a phosphate group. In these nucleotides, there is one of the four possible bases: adenine (A), guanine (G), cytosine (C), or thymine (T) ( Figure below ). Adenine and guanine are purine bases, and cytosine and thymine are pyrimidine bases. Q: What does the base of a nucleotide within dna consist of? Choices: - ribosomes - protein - hydrogen - nitrogen A:
(A).
nitrogen
Ques:Answer the following question given this paragraph: Q: What are sensory cells? Choices: - specialized epithelial or squirm cells - specialized neurons or squirm cells - specialized neurons or navigable cells - specialized neurons or epithelial cells A:

Ans:specialized neurons or epithelial cells
Answer the following question given this paragraph: Figure 4.16 Lactic acid fermentation is common in muscles that have become exhausted by use. Q: What is common in muscles that have become exhausted by use? Choices: - Blood Acid Fermentation - vibration acid fermentation - clumps acid fermentation - lactic acid fermentation A:
lactic acid fermentation