The Calvin cycle operates during which part of photosynthesis?
a) Only the light reaction
b) Only the dark reaction
c) Both light and dark reactions
d) Only photosystem I
Ans: c) Both light and dark reactions
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Four of the five processes listed below cause stomata
to open. Select the exception. a. activity of abscisic acid b. potassium ions building up in guard cells c. water moving from epidermal cells to guard cells d. turgor pressure increasing in guard cells e. guard cells carrying on photosynthesis
Describe the evidence for the existence of a flowering promoter and also for the existence of a flowering inhibitor. What will be an ideal response?
Where is erythropoietin produced?
a. in the liver b. in the heart c. in the lymph nodes d. in the kidneys
Botulinum toxin- A toxin produced by the bacterium Clostridium botulinum.Known for sometimes lethal poisoning from infected meat products. In modern controlled medical or cosmetic use, the very same toxin is known as Botox.Tetanus toxin- Another very potent neurotoxin produced by Clostridium tetani.Strichnine- A highly poisonous alkaloid produced by the Strychnos nux-vomica tree,historically used to kill rats and other pests.You accidentally consume botulinum toxin by eating a contaminated can of sausages. What do you predict will be the most harmful physiological effect?
A. Pupil dilation B. Respiratory failure due to flaccid paralysis (relaxed muscles) C. Slowed action potential conduction D. Respiratory failure due to spastic paralysis (constant muscle contraction)