Answer:
a. allow a variety of molecules to cross the cytoplasmic membrane
Explanation:
The cells have different molecules in its membrane. As a membrane the main function of it is to regulate the income and outcome of substances that the cell needs or the cell has like some wastes.
Some of these molecules can be some proteins like the permeases, that is going to regulate the solutes that can enter the cell, but since they are non specific, that means that can not make the difference among one carbohydrate and another (as an example).
Answer:
The correct answer is b. He determined that DNA contains four nitrogenous bases.
Explanation:
Levene was an American biochemist who studied the structure of DNA in the early 1900s and in 1920 he found that DNA consists of four nitrogenous bases that are Adenine, Guanine, Thymine, Cytosine.
He also found deoxyribose sugar and phosphate group and said that nucleotide is the basic unit of DNA which contains a ribose sugar with attached nitrogenous base and phosphate group.
He also concludes that an equal amount of adenine, guanine, thymine, and cytosine makes the DNA which is now known as tetranucleotide hypothesis. So the correct answer is b. He determined that DNA contains four nitrogenous bases.
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Answer:
B. A drug that prevents the conversion of glucose into pyruvate
Explanation:
<em>Streptococcus mutans</em> is a facultatively anaerobic bacterium, i.e., a microorganism capable of producing ATP by both aerobic (when there is oxygen), and anaerobic (i.e., when there is no oxygen available) conditions. This bacterium is observed in the human oral cavity where causes the majority of tooth decay. <em>S. mutans</em> can digest carbohydrates (e.g. glucose, fructose and lactose) in order to produce lactic acid, which contributes to tooth decay. Glycolysis is the fermentation of glucose to pyruvate in anaerobic conditions, and thereby it is expected that a drug capable of preventing the conversion of glucose into pyruvate in anaerobic conditions is effective to prevent cavities caused by <em>S. mutans</em>.
