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In: Biology

f venom evolved in a lizard ancestor of snakes, and was subsequently lost in many descendants,...

f venom evolved in a lizard ancestor of snakes, and was subsequently lost in many descendants, which is a plausible hypothesis for the loss of venom?

Venomous snakes created an inbalance in the natural order, and thus, many snakes lost it for the good of the species.

Venom is metabolically costly to produce, and when other methods of killing prey (ie., constriction) are available, venom was lost to save energy.

Venom has no real adaptive funciton, and mostly exists to create terror in humans.

Since venomous snakes lack predators, the trait was no longer needed for defense.

The premise of this question is false - all snakes are venomous.

13. An investigator does a control series of experiments examining the production of HCO3 when different concentrations of CO2 are added to a number of test tubes all having the same amount of an enzyme that catalyzes this reaction. What should the investigator expect the graph of the raw data to look like when plotting the data points for the total amount of HCO3 produced in each test tube?

A hyperbolic curve with a clear Vmax

a flat line

a straight line with a positive slope

a straight line with a negative slope

A plot with a hyperbolic component but that has no obvious Vmax


thats all the info i got its a multiple choice question

Solutions

Expert Solution

question 1)--- second option is correct, that is venome is metabolically costly to produce, and when other methods of killing prey are available, venome was lost to save energy. (numbering of option is not clear in option)

possible explanation: Snake venomes have been found to be more specifically evolved (more toxic) against the animal species that are closly related to their pray species, and also the toxicity and amount of venome needed to kill the pray depends upon the environment the snake and its pray live in. That's why some sankes are evolutionarily venomous and others are not.

question 13. first option is correct: hyperbolic curve with a clear Vmax

Explanation: The given question describes the properties of Machaelis-Menten kinetics for enzymes where. the increasing concentations of substrate (CO2) will increase the velocity of enzyme catalysis untill the saturation occurs. A clear Vmax can be obtained at Km of substrate concentration and the curve will be hyperbolic.

gladiator answered 2 years ago
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