Answer the following question given this paragraph: water that flows over the land from precipitation or melting snow or ice. Q: What substance flows over the land from precipitation or melting snow or ice? Choices: - nitrogen - lava - air - water A:
water
(Question)
Answer the following question given this paragraph: RNA is studied to understand gene expression patterns in cells. RNA is naturally very unstable because enzymes that break down RNA are commonly present in nature. Some are even secreted by our own skin and are very difficult to inactivate. Similar to DNA extraction, RNA extraction involves the use of various buffers and enzymes to inactivate other macromolecules and preserve only the RNA. Gel Electrophoresis Because nucleic acids are negatively charged ions at neutral or alkaline pH in an aqueous environment, they can be moved by an electric field. Gel electrophoresis is a technique used to separate charged molecules on the basis of size and charge. The nucleic acids can be separated as whole chromosomes or as fragments. The nucleic acids are loaded into a slot at one end of a gel matrix, an electric current is applied, and negatively charged molecules are pulled toward the opposite end of the gel (the end with the positive electrode). Smaller molecules move through the pores in the gel faster than larger molecules; this difference in the rate of migration separates the fragments on the basis of size. The nucleic acids in a gel matrix are invisible until they are stained with a compound that allows them to be seen, such as a dye. Distinct fragments of nucleic acids appear as bands at specific distances from the top of the gel (the negative electrode end) that are based on their size (Figure 10.3). A mixture of many fragments of varying sizes appear as a long smear, whereas uncut genomic DNA is usually too large to run through the gel and forms a single large band at the top of the gel. Q: What is studied to understand gene expression patterns in cells? Choices: - dna - protein - mutations - rna A:
(Answer)
rna
Ques: Answer the following question given this paragraph: When an earthquake occurs under the ocean, it sends waves through the water as well as the ground. When the energy of the earthquake reaches shore, it forms a huge wave called a tsunami. Q: When the energy of the earthquake reaches shore, it forms a huge wave called? Choices: - a surge - a typhoon - a tidal wave - a tsunami A:
Ans: a tsunami
(Q).
Answer the following question given this paragraph: Volcanoes and earthquakes are common at active margins. Active margins are near plate boundaries. Q: What are two common weather characteristics of hurricanes? Choices: - low winds and sandstorms - high winds and snowfall - small winds and rainfall - high winds and rainfall A:
(A).
high winds and rainfall
Ques:Answer the following question given this paragraph: A chain of volcanoes forms as an oceanic plate moves over a hot spot. This is how it happens. A volcano forms over the hotspot. Since the plate is moving, the volcano moves off of the hotspot. When the hotspot erupts again, a new volcano forms over it. This volcano is in line with the first. Over time, there is a line of volcanoes. The youngest is directly above the hot spot. The oldest is the furthest away ( Figure below ). Q: Volcano chains form as an oceanic plate moves over what? Choices: - dust spot - Water spot - melt spot - hot spot A:

Ans:hot spot
Answer the following question given this paragraph: In myopia, the eye is too long. Below, you can see how images are focused on the retina of someone with myopia ( Figure below ). Myopia is corrected with a concave lens, which curves inward like the inside of a bowl. The lens changes the focus, so images fall on the retina as they should. Q: What vision defect occurs because the eye is too long? Choices: - hyperopia - blindness - astigmatism - myopia A:
myopia