Essential amino acids are those that______________

Question

BlackTom AI · Accepted Answer

Essential amino acids cannot be synthesized in adequate amounts by the human body and therefore must be supplied through the diet.

Relevant knowledge points and concepts:
- Amino acids are building blocks of proteins; the body needs twenty standard amino acids to make proteins and perform metabolic functions.
- "Essential" amino acids are those the body cannot produce (or cannot produce in sufficient quantity) and so must be consumed.
- Adults require nine essential amino acids: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. Some amino acids (e.g., arginine) are conditionally essential in certain life stages or illnesses.

Step-by-step reasoning:
1. Determine definition: essential = must be obtained externally because endogenous synthesis is insufficient.
2. Apply to choices: any true statement about essential amino acids must reflect dietary necessity.
3. Evaluate each answer:
   - "Are not needed by the body": If an amino acid were not needed, it wouldn’t be labeled essential. This contradicts the definition.
   - "Must be obtained from diet": Matches the definition exactly — essential amino acids are required in the diet.
   - "Can be synthesized by the body": This is the opposite of essential; those that can be synthesized are called nonessential amino acids.
   - "Are only found in plants": Essential amino acids occur in both plant and animal proteins; many animal proteins are complete sources containing all essential amino acids.

Why the correct answer is correct:
Because the defining property of essential amino acids is that endogenous synthesis is absent or insufficient, dietary intake is necessary to meet physiological needs. Failure to consume adequate amounts leads to impaired protein synthesis and clinical deficiency symptoms.

Other options are incorrect: they contradict the definition (not needed; can be synthesized) or make a false exclusivity claim (only found in plants).

Conclusion: The correct answer is "Must be obtained from diet," which matches the provided answer.

Essential amino acids are those that______________单项选择题

类似问题

A young man with a frequent history of herpes, and a lack of concentration was suggested to use the following:

In alternative medicine the following amino-acid is used for body building, immune system stimulation and for kidney stone prevention:

A young man with a predisposition for baldness, and a recent history of psoriasis was suggested to use the following:

Supplements to “increase male performance “ will always include the following:

The following is correct about use of amino-acids in alternative medicine

In alternative medicine DL-Phenylalanine is typically used for the following EXCEPT:

Which amino acid is unique for having a secondary nitrogen in its backbone and often introduces kinks in polypeptide chains?

Name the amino acid required for the manufacture of haemoglobin

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