Answer the following question given this paragraph: A nuclear fusion reaction is so named because the nuclei (center) of atoms fuse (join) together in the process. In stars like our Sun, hydrogen atoms join together to create a helium atom. Nuclear fusion reactions need a lot of energy to get started. Once they begin, they produce even more energy. ( Figure below ). Q: In stars like our sun, hydrogen atoms join together to create what? Choices: - water molecule - oxygen atom - iron atom - helium atom A:
helium atom
(Question)
Answer the following question given this paragraph: Examples of alloys include steel, bronze, and brass. Q: Steel, bronze, and brass are good examples of what? Choices: - metalloids - elements - salts - alloys A:
(Answer)
alloys
Ques: Answer the following question given this paragraph: Centrioles are made of short microtubules and are very important in cell division. Q: What are centrioles made from? Choices: - carbon - short filaments - short particles - short microtubules A:
Ans: short microtubules
(Q).
Answer the following question given this paragraph: Q: The cells of what basic plant structure lack chloroplasts? Choices: - leaf - stem - ferns - root A:
(A).
root
Ques:Answer the following question given this paragraph: Viruses vary in their structure. A virus particle consists of DNA or RNA within a protective protein coat called a capsid. The shape of the capsid may vary from one type of virus to another. The capsid is made from the proteins that are encoded by viral genes within their genome. Q: The capsid is made from the what that are encoded by viral genes within their genome? Choices: - lipids - acids - hormones - proteins A:

Ans:proteins
Ques:Answer the following question given this paragraph: 26.4 Microscopes Although the eye is marvelous in its ability to see objects large and small, it obviously has limitations to the smallest details it can detect. Human desire to see beyond what is possible with the naked eye led to the use of optical instruments. In this section we will examine microscopes, instruments for enlarging the detail that we cannot see with the unaided eye. The microscope is a multiple-element system having more than a single lens or mirror. (See Figure 26.15) A microscope can be made from two convex lenses. The image formed by the first element becomes the object for the second element. The second element forms its own image, which is the object for the third element, and so on. Ray tracing helps to visualize the image formed. If the device is composed of thin lenses and mirrors that obey the thin lens equations, then it is not difficult to describe their behavior numerically. Q: A microscope can be made from two of what kind of lenses? Choices: - inner - angular - outer - convex A:

Ans:
convex