Answer the following question given this paragraph: Figure 3.5 Glucose, galactose, and fructose are all hexoses. They are structural isomers, meaning they have the same chemical formula (C6H12O6) but a different arrangement of atoms. Q: Glucose, galactose, and fructose are all what? Choices: - alucoxes - structoxes - fluxes - hexoses A:
hexoses
(Question)
Answer the following question given this paragraph: Cancer and Epigenetic Alterations Silencing genes through epigenetic mechanisms is also very common in cancer cells. There are characteristic modifications to histone proteins and DNA that are associated with silenced genes. In cancer cells, the DNA in the promoter region of silenced genes is methylated on cytosine DNA residues in CpG islands. Histone proteins that surround that region lack the acetylation modification that is present when the genes are expressed in normal cells. This combination of DNA methylation and histone deacetylation (epigenetic modifications that lead to gene silencing) is commonly found in cancer. When these modifications occur, the gene present in that chromosomal region is silenced. Increasingly, scientists understand how epigenetic changes are altered in cancer. Because these changes are temporary and can be reversedfor example, by preventing the action of the histone deacetylase protein that removes acetyl groups, or by DNA methyl transferase enzymes that add methyl groups to cytosines in DNAit is possible to design new drugs and new therapies to take advantage of the reversible nature of these processes. Indeed, many researchers are testing how a silenced gene can be switched back on in a cancer cell to help re-establish normal growth patterns. Genes involved in the development of many other illnesses, ranging from allergies to inflammation to autism, are thought to be regulated by epigenetic mechanisms. As our knowledge of how genes are controlled deepens, new ways to treat diseases like cancer will emerge. Q: Silencing genes through epigenetic mechanisms is commonly practiced on what type of uncontrolled cells? Choices: - giving cells - neutral cells - innoculous cells - cancer cells A:
(Answer)
cancer cells
Ques: Answer the following question given this paragraph: For each of the following situations, tell whether the rate of the reaction would increase or decrease, and explain your answer in terms of collision theory. The concentration of a reactant is doubled. Q: What is formed when atoms of different elements combine in a chemical reaction? Choices: - crystals - dust - toxins - compounds A:
Ans: compounds
(Q).
Answer the following question given this paragraph: The penumbra is the part of the shadow that is partially lit. Q: What is the part of the shadow that is partially lit called? Choices: - eclipse - pleura - pentila - penumbra A:
(A).
penumbra
Ques:Answer the following question given this paragraph: As with melting, the energy in boiling goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. So boiling is also an isothermal process. Only when all of a substance has boiled does any additional energy go to changing its temperature. What happens when a liquid becomes a gas? We have already established that a liquid is composed of particles in contact with each other. When a liquid becomes a gas, the particles separate from each other, with each particle going its own way in space. This is how gases tend to fill their containers. Indeed, in the gas phase most of the volume is empty space; only about 1/1,000th of the volume is actually taken up by matter (Figure 10.4 "Liquids and Gases"). It is this property of gases that explains why they can be compressed, a fact that is considered in Chapter 6 "Gases". Figure 10.4 Liquids and Gases. Q: What kind of process is boiling? Choices: - chemical - spheroidal - cavitation - isothermal A:

Ans:isothermal
Ques: Answer the following question given this paragraph: Other dry climates get a little more precipitation. They are called steppes . These regions have short grasses and low bushes ( Figure below ). Steppes occur at higher latitudes than deserts. They are dry because they are in continental interiors or rain shadows. Q: What is the type of landscape that occurs at higher latitudes than deserts, has short grasses and low bushes, and are dry because they are in continental interiors? Choices: - tundra - plains - plateau - steppe A:
Ans:
steppe