Which of the following is directly related to a single amino acid?
A) the base sequence of the tRNA
B) the amino acetyl tRNA synthase
C) the three-base sequence of mRNA
D) the complementarity of DNA and RNA
Answer: C
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During glycolysis, glucose molecules are broken down by breaking the carbon-hydrogen bonds that
are present and forming carbon-oxygen bonds. What is this chemical phenomena called?
a. oxidation b. reduction c. protonation d. electrolysis e. pyruvate reduction
Darwin's observations led to his proposal that evolution occurred due to ____
a. acquired characteristics b. climatic changes c. natural selection d. migration e. interaction of species
The plant hormone abscisic acid (ABA) is involved in the regulation of photorespiration. Based on this information, ABA likely plays a role in
A. the photoelectric effect. B. cyclic photophosphorylation. C. the opening and closing of stomata. D. noncyclic photophosphorylation.
Imagine that you are conducting an experiment on an enzyme known as sucrase. This enzyme is synthesized and used by yeast cells to break down the disaccharide sucrose (table sugar) into the monosaccharides glucose and fructose
You decide to conduct an experiment to test whether the sucrase enzyme can break down the artificial sweetener sucralose. Sucralose (a "chlorinated" carbohydrate) has some chemical similarity to sucrose, but is different in that three of its hydroxyl groups are missing and replaced with chlorine atoms instead. Based on the details provided in this scenario, do you think the sucrase enzyme will be able to interact with sucralose? A) Yes; enzymes such as sucrase are not specific for their substrate. B) Yes; the enzymes in human cells can interact with artificial sweeteners as if they were sugars. C) No; sucralose is an ion and not a true carbohydrate. D) No; all enzymes are highly specific and can react with only a specific substrate.