Both glycolysis and the citric acid cycle can be regulated by feedback inhibition. Provide two examples of feedback
inhibition.
What will be an ideal response?
ANSWER: In glycolysis, if excess ATP is present in the cytosol it binds to phosphofructokinase
inhibiting fructose-6-phosphate from being converted to fructose-1, 6-bisphosphate. In the
citric acid cycle the enzyme citrate synthase is inhibited by elevated ATP concentrations.
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Organisms that are not drastically affected by increased pressure are called
A. osmophilic. B. barophilic. C. barotolerant. D. osmotolerant.
You are a doctor who examines a swollen and warm puncture wound on the hand of a patient. Indicate which of the following statements are true and which are false. ______ The wound is swollen and red due to vasoconstriction
______ The wound breached the first level of the patient's innate immune system: the skin. ______ The wound may require both the innate and the adaptive immune system in order to heal. ______ The wound is swollen and red due to vasodilation. ______ Cells in the wound are secreting antihistamines . What will be an ideal response?
A graph of phenotypic variation similar to the
illustration below strongly suggests a. incomplete dominance. b. codominance. c. epistasis. d. polygenic inheritance. e. environmental effects on phenotype.
Which of the following statements is true?
(a) The mitotic spindle is largely made of intermediate filaments. (b) The contractile ring is made largely of microtubules and actin filaments. (c) The contractile ring divides the nucleus in two. (d) The mitotic spindle helps segregate the chromosomes to the two daughter cells.