Ques: Answer the following question given this paragraph: Remember the quarks from the first page of this chapter? Quarks are even tinier particles of matter that make up protons and neutrons. There are three quarks in each proton and three quarks in each neutron. The charges of quarks are balanced exactly right to give a positive charge to a proton and a neutral charge to a neutron. It might seem strange that quarks are never found alone but only as components of other particles. This is because the quarks are held together by very strange particles called gluons. Q: How many quarks are in each proton and neutron? Choices: - ten - five - four - three A:
Ans: three

Ques: Answer the following question given this paragraph: How does sap get to the tops of tall trees? (Recall that a column of water can only rise to a height of 10 m when there is a vacuum at the topsee Example 11.5. ) The question has not been completely resolved, but it appears that it is pulled up like a chain held together by cohesive forces. As each molecule of sap enters a leaf and evaporates (a process called transpiration), the entire chain is pulled up a notch. So a negative pressure created by water evaporation must be present to pull the sap up through the xylem vessels. In most situations, fluids can push but can exert only negligible pull, because the cohesive forces seem to be too small to hold the molecules tightly together. But in this case, the cohesive force of water molecules provides a very strong pull. Figure 11.36 shows one device for studying negative pressure. Some experiments have demonstrated that negative pressures sufficient to pull sap to the tops of the tallest trees can be achieved. Q: How does sap get to the tops of tall trees? Choices: - through suction power - via Coriolis forces - through pressure from below - through negative pressure A:
Ans: through negative pressure

Ques: Answer the following question given this paragraph: Compared to other liquids, water has a relatively high surface tension and heat capacity. Both of these properties are partially a result of the strong hydrogen bonds that hold water molecules together. Q: Compared to others, what type of liquid has a relatively high surface tension and heat capacity? Choices: - oil - wine - blood - water A:
Ans: water

Ques: Answer the following question given this paragraph: Development of Bone Ossification, or osteogenesis, is the process of bone formation by osteoblasts. Ossification is distinct from the process of calcification; whereas calcification takes place during the ossification of bones, it can also occur in other tissues. Ossification begins approximately six weeks after fertilization in an embryo. Before this time, the embryonic skeleton consists entirely of fibrous membranes and hyaline cartilage. The development of bone from fibrous membranes is called intramembranous ossification; development from hyaline cartilage is called endochondral ossification. Bone growth continues until approximately age 25. Bones can grow in thickness throughout life, but after age 25, ossification functions primarily in bone remodeling and repair. Q: What begins approximately six weeks after fertilization in an embryo? Choices: - calcification - elongation - incubation - ossification A:
Ans:
ossification