Answer the following question given this paragraph:   Diffusion will continue until the concentration gradient has been eliminated. Since diffusion moves materials from an area of higher concentration to the lower, it is described as moving solutes "down the concentration gradient. " The end result of diffusion is an equal concentration, or equilibrium , of molecules on both sides of the membrane. At equilibrium, movement of molecules does not stop. At equilibrium, there is equal movement of materials in both directions.   Q: The end result of diffusion is an equal concentration, or equilibrium , of molecules on both sides of what?   Choices:  - the cell  - the organism  - the organelle  - the membrane  A:
the membrane


(Question)
Answer the following question given this paragraph:   Muscles can only contract. They can’t actively lengthen. Therefore, to move bones back and forth at a joint, skeletal muscles must work in pairs. For example, the bicep and triceps muscles of the upper arm work as a pair. You can see how this pair of muscles works in Figure below . When the bicep muscle contracts, it bends the arm at the elbow. When the triceps muscle contracts, it straightens the arm.   Q: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only do what?   Choices:  - vibrate  - pull  - expand  - contract  A:
(Answer)
contract


Ques: Answer the following question given this paragraph:   There are three types of RNA involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribisomal RNA (rRNA). All three of these nucleic acids work together to produce a protein. The mRNA takes the genetic instructions from the nucleus to the cytoplasm, where the ribosomes are located. Ribosomes are the organelles where the proteins are made. The ribosomes themselves are made out of rRNA and other proteins. The mRNA binds to the ribosome, bringing the genetic instructions to order the amino acids to the site of protein synthesis. Finally, the tRNA brings the correct amino acid to the ribosome ( Figure below and Figure below ). In mRNA, the four nucleotides (A, C, G, and U) are arranged into codons of three bases each. Each codon encodes for a specific amino acid, except for the stop codons , which terminate protein synthesis. tRNA, which has a specific “3-leaf clover structure,” contains a three base region called the anticodon , which can base pair to the corresponding three-base codon region on mRNA. More will be discussed on these processes in the Protein Synthesis: The Genetic Code (Advanced) and Protein Synthesis: Translation (Advanced) concepts.   Q: What are the three types of rna involved in protein synthesis?   Choices:  - messenger, organic and transfer  - messenger, transfer, and organic  - organic , transfer , and ribosomal  - messenger, transfer, and ribosomal  A:
Ans: messenger, transfer, and ribosomal


(Q).
Answer the following question given this paragraph:   The blades of simple leaves are not divided. This provides the maximum surface area for collecting sunlight.   Q: What is the limiting factor for bacteria in a dish?   Choices:  - density  - speed  - material  - space  A:
(A).
space


Ques:Answer the following question given this paragraph:      Q: In human females, the mammary glands are associated with, but not part of, what organ system that is used to create new humans?   Choices:  - immune  - digestive  - endocrine  - reproductive  A:

Ans:reproductive


Question: Answer the following question given this paragraph:   All of the inner planets are orbited by man-made satellites. Jupiter and Saturn have man-made satellites too. We can see what the planets look like from the photos they take. The satellites also carry instruments that collect a lot of important data. This is better than taking a field trip to such hostile places. You can learn a lot while sitting your own, very comfortable planet!.   Q: What man-made structures orbit all of the inner planets as well as jupiter and saturn?   Choices:  - comets  - space shuttles  - moons  - satellites  A:
Answer:
satellites