If the L1/2 of a ligand-receptor has been determined to be approximately 40ng/mL. What would be the expected concentration range of ligand in the bloodstream if this were to be a hormone?

Question

BlackTom AI · Accepted Answer

Question restatement: You are told that the L1/2 (half-maximal effective concentration, often related to receptor binding) of a ligand-receptor system is approximately 40 ng/mL, and you’re asked what the expected concentration range of the ligand would be in the bloodstream if this ligand acts as a hormone.
Option 1: 'it would likely be much higher than the L1/2' This is unlikely for a hormone in typical receptor-ligand dynamics. If circulating levels were much higher than the L1/2, you would expect very high receptor occupancy and potential desensitization or saturation effects; endocrine signaling does not generally require circulating concentrations vastly exceeding the L1/2 to exert function. Thus this choice overestimates the necessary plasma level.
Option 2: 'It would need to be approximately 10 ng/mL' This value is below the given L1/2 (40 ng/mL). While certain hormones can have varying physiological ranges, asserting a fixed value like 10 ng/mL without context misrepresents the relationship between L1/2 and expected blood concentration. The question asks for a range relative to L1/2 rather than a specific unrelated number, making this option less credible.
Option 3: 'it would need to be lower than the L1/2' This aligns with the general principle that receptor occupancy (and thus activity) reaches about 50% at the L1/2. Physiological signaling for hormones often operates with circulating levels around or below the L1/2, especially when downstream amplification or high receptor sensitivity exists. Therefore, a concentration lower than 40 ng/mL is a plausible and common scenario for hormonal action.
Option 4: 'it would have to be at least in the range of the L1/2' While being around the L1/2 could produce substantial receptor occupancy, saying it must be at least at that level is overly restrictive. Hormonal effects can occur below, at, or even above the L1/2 depending on receptor affinity, down-stream signaling, half-life, and amplification. This makes this option too prescriptive and not universally applicable.
In summary, the most consistent choice with receptor-ligand dynamics and hormone signaling principles is that circulating levels would be lower than the L1/2, rather than significantly higher or strictly equal to it. The other options either overstate, misplace, or overspecify the relationship between L1/2 and physiological concentration ranges.

If the L1/2 of a ligand-receptor has been determined to be approximately 40ng/mL. What would be the expected concentration range of ligand in the bloodstream if this were to be a hormone? 单项选择题

类似问题

What was the world's first widely adopted biodiversity policy?

The aim of the Paris Agreement is to ensure that the earth’s preindustrial temperature is not exceeded by more than º Celsius.

The IPCC's mission is to Blank ______.

Why have most international agreements for environmental protection been based on the honor system?

As was exhibited with the Montreal Protocol and the encouragement of reduced CFC production, trade can be an effective tool to compel compliance with international treaties.

The Stockholm Declaration and UNEP were the result of the Blank ______ first conference on the Human Environment in 1972.

In addition to the direct mission of the Convention on International Trade in Endangered Species (CITES), why was CITES so important?

President Trump hiring a corporate leader from the oil and gas industry to head the Department of Energy is an example of regulatory ; one intention behind this was to change environmental policy.

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单