*Question*
Q: Each muscle fiber contains hundreds of organelles called what? Read this paragraph and choose the correct option from the provided answers: Each muscle fiber contains hundreds of organelles called myofibrils. Each myofibril is made up of two types of protein filaments: actin filaments, which are thinner, and myosin filaments, which are thicker. Actin filaments are anchored to structures called Z lines (see Figure below ). The region between two Z lines is called a sarcomere. Within a sarcomere, myosin filaments overlap the actin filaments. The myosin filaments have tiny structures called cross bridges that can attach to actin filaments. Choices: - fast glycolytic fibres - slow twitch fibres - pores - myofibrils A:
**Answer**
myofibrils

*Question*
Q: What is it that surrounds cells and serve to keep the insides separated from the outsides? Read this paragraph and choose the correct option from the provided answers: Membranes Biological membranes surround cells and serve to keep the insides separated from the outsides. They are formed of phospholipid bilayer1 s, which by definition are a double layer of fatty acid2 molecules (mostly phospholipid3 s, lipids containing lots of phosphorus). Proteins4 serve very important functions in cellular membranes. They are active transports in and out of the cell, acting as gatekeepers. They relay signals in and out of the cell. Proteins are the site of many enzymatic reactions in the cell, and play a role in regulation of cellular processes. Choices: - inner membranes - abundant membranes - similar membranes - biological membranes A:
**Answer**
biological membranes

*Question*
Q: Large or small numbers are expressed in scientific notation, which use powers of this? Read this paragraph and choose the correct option from the provided answers: Large or small numbers are expressed in scientific notation, which use powers of 10. Choices: - 2 - 4 - 16 - 10 A:
**Answer**
10

*Question*
Q: On what basis are lipoproteins classified? Read this paragraph and choose the correct option from the provided answers: Other lipoproteins also transport lipids throughout the body, but different types of lipoproteins tend to serve different functions. We will discuss some of these differences in the section below on cholesterol and heart disease. Lipoproteins are often classified into five different groups based on their densities. In increasing order of density, these groups include chylomicrons, very-low-density lipoproteins (VLDL), intermediate-density lipoproteins (IDL), low-density lipoproteins (LDL), and high-density lipoproteins (HDL). Choices: - diameter - mass - weight - density A:
**Answer**
density