Q: What determines the length and thickness of dna chromosomes? Read this paragraph and choose the correct option from the provided answers: The degree of DNA coiling determines whether the chromosome strands are short and thick or long and thin. Between cell divisions, the DNA in chromosomes is more loosely coiled and forms long thin strands called chromatin . DNA is in this uncoiled form during the majority of the cell cycle, making the DNA available to the proteins involved in DNA replication and transcription. Before the cell divides, the chromatin coils up more tightly and form chromosomes. Only chromosomes stain clearly enough to be seen under a microscope. The word chromosome comes from the Greek word chroma (color), and soma (body) due to its ability to be stained strongly by dyes. Choices: - degree of rna coiling - type of dna - number of chromosomes - degree of dna coiling A:
degree of dna coiling

Q: Poetically speaking, nature reserves are islands of what, in a sea of habitat degraded by human activity? Read this paragraph and choose the correct option from the provided answers: Choices: - refuge - habitats - ecosystem - biodiversity A:
biodiversity

Q: Q: What type of winds are created when more solar energy strikes the equator than the polar regions? Read this paragraph and choose the correct option from the provided answers: Winds on Earth are either global or local. Global winds blow in the same directions all the time. They are created when more solar energy strikes the Equator than the polar regions. More about global wind patterns is described in detail in the concept "Global Wind Belts. ". Choices: - arctic winds - equatorial winds - domestic winds - global winds A:
A: global winds

Question: Q: On what part of bones would you expect to find cartilage? Read this paragraph and choose the correct option from the provided answers: The adult human skeleton has 206 bones, some of which are named below ( Figure below ). Bones are made up of living tissue. They contain many different types of tissues. Cartilage, a dense connective tissue, is found at the end of bones and is made of tough protein fibers. Cartilage creates smooth surfaces for the movement of bones that are next to each other, like the bones of the knee. Choices: - interior - marrow - exterior - end A:
Answer: end

*Question*
Q: What substances, which are distinct from acids and bases, form when ions form ionic bonds? Read this paragraph and choose the correct option from the provided answers: Salts Recall that salts are formed when ions form ionic bonds. In these reactions, one atom gives up one or more electrons, and thus becomes positively charged, whereas the other accepts one or more electrons and becomes negatively charged. You can now define a salt as a substance that, when dissolved in water, dissociates into ions other than H+ or OH. This fact is important in distinguishing salts from acids and bases, discussed next. A typical salt, NaCl, dissociates completely in water (Figure 2.15). The positive and negative regions on the water molecule (the hydrogen and oxygen ends respectively) attract the negative chloride and positive sodium ions, pulling them away from each other. Again, whereas nonpolar and polar covalently bonded compounds break apart into molecules in solution, salts dissociate into ions. These ions are electrolytes; they are capable of conducting an electrical current in solution. This property is critical to the function of ions in transmitting nerve impulses and prompting muscle contraction. Choices: - oils - vitamins - water molecules - salts A:
**Answer**
salts

Q: Q: What is the term for atherosclerosis of arteries that supply the heart muscle? Read this paragraph and choose the correct option from the provided answers: Atherosclerosis of arteries that supply the heart muscle is called coronary heart disease . This disease may or may not have symptoms, such as chest pain. As the disease progresses, there is an increased risk of heart attack. A heart attack occurs when the blood supply to part of the heart muscle is blocked and cardiac muscle fibers die. Coronary heart disease is the leading cause of death of adults in the United States. Choices: - rapid heart disease - essential heart disease - cardiovascular disease - coronary heart disease A:
A: coronary heart disease