Glucose is converted into glucose 6-phosphate by hexokinase. Glucose 6-phosphate then serves as the substrate for the enzyme phosphoglucose isomerase, which converts this reactant into fructose 6-phosphate. Fructose 6-phosphate serves as the substrate for phosphofructokinase, which converts fructose 6-phosphate into fructose 1,6-bisphosphate. Based on the information provided, this is an example of
A. enzyme inhibition.
B. a metabolic pathway.
C. allosteric regulation.
D. feedback inhibition.
Answer: B
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Suppose a microbiologist wanted to identify the microbe responsible for a specific metabolic activity. To simultaneously assess metabolic activity and phylogenetic identity, the best technique would be ________.
A. optical tweezers with microelectodes B. microautoradiography with fluorescent in situ hybridization (MAR-FISH) C. isotope fractionation D. metatranscriptomics
You are a genetic counselor, and a couple comes to you with concerns that if they have a child
together it could have hemophilia. The man has an X-linked recessive form of hemophilia, but the woman does not. Genetic tests reveal the woman is not a carrier for hemophilia. Which of the following would be a correct thing to tell them?
a. Any child that they produce will have a 50% chance of having hemophilia. b. All of their male offspring will have hemophilia, and each of their female offspring will have a 50% chance of having hemophilia. c. None of their offspring should have hemophilia, but all of their female offspring will be carriers for hemophilia. d. Each of their male offspring will have a 50% chance of having hemophilia, and while their female offspring should not have hemophilia, they will each have a 50% chance of being carriers. e. All of their male offspring will have hemophilia, and while their female offspring should not have hemophilia, they will all be carriers.
Which of the following best describes Mendel’s hybridizations?
a. the mating of two true-breeding individuals that have similar forms of the trait of interest b. the mating of two true-breeding individuals that have different forms of the trait of interest c. the mating of offspring back to one or both of their parents d. the mating of dominant-expressing organisms with homozygous recessive organisms
The effect of directional growth shown in the above
figure is known to be caused by a. thigmotropism. b. gravitropism. c. abscisic acid. d. salicylic acid. e. all of these.