Answer the following question given this paragraph: Brewers of beer and wine use yeast to add alcohol to beverages. Traditional varieties of yeast not only make but also limit the quantity of alcohol in these beverages, because above 18% by volume, alcohol becomes toxic to the yeast itself. Wine is produced by fermentation of the natural sugars present in grapes and other kinds of fruit. Beer, whiskey, and vodka are produced by fermentation of grain starches that have been converted to sugar by the enzyme amylase, and rum is produced by fermentation of sugarcane. In each of these fermentations, sugars are converted into small amounts of ATP, using and regenerating NAD + in the process, and producing ethanol and carbon dioxide. Scientists have recently developed new strains of yeast which can tolerate up to 25% alcohol by volume. These are used primarily in the production of ethanol fuel. Q: Why do beer brewers add yeast to the wort? Choices: - reduce alcohol - add carbonation - increase longevity - to make alcohol A:
to make alcohol
(Question)
Answer the following question given this paragraph: Atoms, which are always neutral in electric charge, contain electrons as well as protons and neutrons. An electron has an electrical charge of -1. If an atom has three electrons, infer how many protons it has. Q: What charge do atoms carry? Choices: - negative - static - positive - neutral A:
(Answer)
neutral
Ques: Answer the following question given this paragraph: In sexually reproducing species, chromosomes are present in cells in pairs. Chromosomes in the same pair are called homologous chromosomes. They have the same genes at the same loci. These may be the same or different alleles. During meiosis, when gametes are produced, homologous chromosomes separate. They go to different gametes. Thus, the alleles for each gene also go to different gametes. Q: What are chromosomes in the same pair called? Choices: - homogeneous chromosomes - regulated chromosomes - reversible chromosomes - homologous chromosomes A:
Ans: homologous chromosomes
(Q).
Answer the following question given this paragraph: Unsaturated hydrocarbons called aromatic hydrocarbons are cyclic hydrocarbons that have double bonds. These compounds have six carbon atoms in a ring with alternating single and double bonds. The smallest aromatic hydrocarbon is benzene, which has just one ring. Its structural formula is shown in the Figure below . Larger aromatic hydrocarbons consist of two or more rings, which are joined together by bonds between their carbon atoms. The name of aromatic hydrocarbons comes from their strong aroma, or scent. That's why they are used in air fresheners and mothballs. You can learn more about these interesting hydrocarbons at this URL:. Q: What is the smallest aromatic hydrocarbon? Choices: - furan - sulfide - phosphate - benzene A:
(A).
benzene
Ques:Answer the following question given this paragraph: Figure 15.1 Fight or Flight? Though the threats that modern humans face are not large predators, the autonomic nervous system is adapted to this type of stimulus. The modern world presents stimuli that trigger the same response. (credit: Vernon Swanepoel). Q: The fight or flight response involves what system? Choices: - functional nervous system - cellular nervous system - voluntary nervous system - autonomic nervous system A:

Ans:autonomic nervous system
Ques:Answer the following question given this paragraph: If the first three are true but not the fourth, then that object is a dwarf planet . We now call Pluto a dwarf planet. There are other dwarf planets in the solar system. They are Eris, Ceres, Makemake and Haumea. There are many other reasons why Pluto does not fit with the other planets in our solar system. Q: What is pluto now called? Choices: - asteroid - planet - meteor - dwarf planet A:

Ans:
dwarf planet