VWO Natuur, leven en technologie Practice Questions - Netherlands VWO Natuur, leven en technologie (NLT) - Schoolexamen - VWO Natuur, leven en technologie Practice Questions - Netherlands VWO Natuur, leven en technologie (NLT)

Question 1

In biophysics, what primary physical mechanism explains why small non-polar molecules like O2 cross cell membranes without transport proteins?

Simple diffusion driven by the intracellular and extracellular concentration gradient Active transport fueled by ATP hydrolysis Primary endocytosis mediated by clathrin-coated pits Facilitated diffusion through voltage-gated ion channels

Correct Answer:

Simple diffusion driven by the intracellular and extracellular concentration gradient

Question 2

According to Poiseuille's law for laminar fluid flow through a physiological vessel, if the radius of a blood vessel decreases by 50%, by what factor does the flow resistance increase?

2 times 4 times 8 times 16 times

Correct Answer:

16 times

Question 3

In enzyme kinetics described by the Michaelis-Menten model, what does the Michaelis constant (Km) represent?

The substrate concentration at which the reaction velocity is half of Vmax The maximum possible reaction velocity when the enzyme is fully saturated The activation energy required for the uncatalyzed reaction pathway The total concentration of enzyme bound to competitive inhibitors

Correct Answer:

The substrate concentration at which the reaction velocity is half of Vmax

Question 4

How does an uncompetitive enzyme inhibitor affect the kinetic parameters Vmax and Km in a Michaelis-Menten system?

It decreases both Vmax and Km by the same multiplicative factor It increases Km while leaving Vmax completely unchanged It decreases Vmax while leaving Km completely unchanged It increases both Vmax and Km proportionally

Correct Answer:

It decreases both Vmax and Km by the same multiplicative factor

Question 5

During the propagation of an action potential along an unmyelinated axon, what mechanism accounts for the refractory period behind the nerve impulse?

Inactivation of voltage-gated Na+ channels and prolonged opening of voltage-gated K+ channels Depletion of ATP stored in mitochondria along the axonal cytoplasm Reversal of the Na+/K+ ATPase pump direction during hyperpolarization Permanent opening of ligand-gated Cl- channels across the node of Ranvier

Correct Answer:

Inactivation of voltage-gated Na+ channels and prolonged opening of voltage-gated K+ channels

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Prepare with the VWO Natuur, leven en technologie Practice Questions - Netherlands VWO Natuur, leven en technologie (NLT) - Schoolexamen practice quiz. This question bank includes 100 questions covering energy, water, radiation, physical, and like. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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VWO Natuur, leven en technologie Practice Questions - Netherlands VWO Natuur, leven en technologie (NLT) - Schoolexamen

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VWO Natuur, leven en technologie Practice Questions - Netherlands VWO Natuur, leven en technologie (NLT) - Schoolexamen

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