Ques:Q: The cytoplasm is all the contents of the cell inside the cell membrane, with the exception of what? Read this paragraph and choose the correct option from the provided answers: Both prokaryotic and eukaryotic cells have structures in common. All cells have a plasma membrane, ribosomes, cytoplasm, and DNA. The plasma membrane , or cell membrane, is the phospholipid layer that surrounds the cell and protects it from the outside environment. Ribosomes are the non-membrane bound organelles where proteins are made, a process called protein synthesis. The cytoplasm is all the contents of the cell inside the cell membrane, not including the nucleus. Choices: - vacuole - lysosome - molecules - nucleus A:

Ans:nucleus
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Ques:Q: Amoebas and paramecia are examples of what? Read this paragraph and choose the correct option from the provided answers: Examples of protozoa include amoebas and paramecia. Choices: - vertebrates - bacteria - protists - protozoa A:

Ans:protozoa
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Ques:Q: What was the first mass extinction that occurred on earth? Read this paragraph and choose the correct option from the provided answers: At the end of the Precambrian, a mass extinction occurred. In a mass extinction , the majority of species die out. The Precambrian mass extinction was the first of six mass extinctions that occurred on Earth. It's not certain what caused this first mass extinction. Changes in Earth's geology and climate were no doubt involved. Choices: - late Devonian mass extinction - paleozoic mass extinction - proterozoic mass extinction - precambrian mass extinction A:

Ans:precambrian mass extinction
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Ques:Q: A microscope can be made from two of what kind of lenses? Read this paragraph and choose the correct option from the provided answers: 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. Choices: - inner - angular - outer - convex A:

Ans:
convex
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