Q: Brass and bronze are examples of what type of mixture composed of two or more elements, at least one of which is a metal? Read this paragraph and choose the correct option from the provided answers: An alloy is a mixture composed of two or more elements, at least one of which is a metal. You are probably familiar with some alloys such as brass and bronze. Brass is an alloy of copper and zinc. Bronze is an alloy of copper and tin. Alloys are commonly used in manufactured items because the properties of these metal mixtures are often superior to a pure metal. Bronze is harder than copper and more easily cast. Brass is very malleable and its acoustic properties make it useful for musical instruments. Choices: - halloid - compound - metalloid - alloy A:
alloy

Q: The distance of stars is measured in what terms, meaning the light takes many thousands of years to reach us? Read this paragraph and choose the correct option from the provided answers: Viewing distant stars is looking back in time. The stars we see are many thousands of light years away, which means the light takes many thousands of years to reach us. Thus the stars we see in the sky are how they looked thousands of years ago. Choices: - light months - light decades - light hours - light years A:
light years

Q: The iron ion used to bind oxygen is on what type of "ring"? Read this paragraph and choose the correct option from the provided answers: The yellow subunits are identical in structure, as are the gray subunits. A smaller organic structure called a porphyrin ring is attached to each protein subunit and contains the iron ion used to bind oxygen. Choices: - DNA ring - petrarchan ring - reagent ring - porphyrin ring A:
porphyrin ring

Q: Linked genes are located on the same what? Read this paragraph and choose the correct option from the provided answers: Genes that are located on the same chromosome are called linked genes . Alleles for these genes tend to segregate together during meiosis, unless they are separated by crossing-over. Crossing-over occurs when two homologous chromosomes exchange genetic material during meiosis I. The closer together two genes are on a chromosome, the less likely their alleles will be separated by crossing-over. At the following link, you can watch an animation showing how genes on the same chromosome may be separated by crossing-over: http://www. biostudio. com/d_%20Meiotic%20Recombination%20Between%20Linked%20Genes. htm . Choices: - genome - nucleolus - bacterium - chromosome A:
chromosome