---
title: Identify the four chemical letters employed in the genetic code of D… — DNA simply: the recipe in every cell · tree and pragmatics
description: Identify the four chemical letters employed in the genetic code of DNA. Exam question 1 of lesson 277 «DNA simply: the recipe in every cell» of the biology course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was right.
---

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# Exam question 1 · DNA simply: the recipe in every cell

<!-- .ven lang=en -->
Identify the four chemical letters employed in the genetic code of DNA.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** you · **What happens:** identify, employ, code · **To what, where:** four chemical letters, genetic code, DNA

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This is exam question 1 of lesson 277 «DNA simply: the recipe in every cell» of the biology course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/biology/277-dna-simply-the-recipe-in-every-cell/#e1).

## The question {#question}

```conllu
# sent_id = question:biology:277-dna-simply-the-recipe-in-every-cell:e1:1
# text = Identify the four chemical letters employed in the genetic code of DNA.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
3	four	four	NUM	CD	NumForm=Word|NumType=Card	5	nummod	_	_
4	chemical	chemical	ADJ	JJ	Degree=Pos	5	amod	_	_
5	letters	letter	NOUN	NNS	Number=Plur	1	obj	_	_
6	employed	employ	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	5	acl	_	_
7	in	in	ADP	IN	_	10	case	_	_
8	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
9	genetic	genetic	ADJ	JJ	Degree=Pos	10	amod	_	_
10	code	code	NOUN	NN	Number=Sing	6	obl	_	_
11	of	of	ADP	IN	_	12	case	_	_
12	DNA	DNA	NOUN	NN	Number=Sing	10	nmod	_	SpaceAfter=No
13	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **identify** | imperative | you *not said here* | the four chemical letters |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent letter=Theme |
| 2 | **employ** | participle |  | the four chemical letters *not said here* |  | the genetic code of DNA |  |  | vn hire-13.5.3 «NP V NP»: agent=Agent |
| 3 | **code** |  |  | DNA |  |  |  |  | nom code «communication transitive»: of=patient |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

## The options {#options}

### Option 1 · ← Mova's choice · ✓ the right answer {#o1}

<!-- .ven lang=en -->
A, T, C and G

```conllu
# sent_id = question:biology:277-dna-simply-the-recipe-in-every-cell:e1:o1:1
# text = A, T, C and G
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	SpaceAfter=No
2	,	,	PUNCT	,	_	3	punct	_	_
3	T	T	PROPN	NNP	Number=Sing	0	root	_	SpaceAfter=No
4	,	,	PUNCT	,	_	5	punct	_	_
5	C	C	PROPN	NNP	Number=Sing	3	conj	_	_
6	and	and	CCONJ	CC	_	7	cc	_	_
7	G	G	PROPN	NNP	Number=Sing	5	conj	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 2 {#o2}

<!-- .ven lang=en -->
X, Y, Z and W

```conllu
# sent_id = question:biology:277-dna-simply-the-recipe-in-every-cell:e1:o2:1
# text = X, Y, Z and W
1	X	x	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
2	,	,	PUNCT	,	_	3	punct	_	_
3	Y	Y	PROPN	NNP	Number=Sing	1	flat	_	SpaceAfter=No
4	,	,	PUNCT	,	_	5	punct	_	_
5	Z	Z	PROPN	NNP	Number=Sing	1	appos	_	_
6	and	and	CCONJ	CC	_	7	cc	_	_
7	W	W	PROPN	NNP	Number=Sing	5	conj	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 3 {#o3}

<!-- .ven lang=en -->
A, B, C and D

```conllu
# sent_id = question:biology:277-dna-simply-the-recipe-in-every-cell:e1:o3:1
# text = A, B, C and D
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	SpaceAfter=No
2	,	,	PUNCT	,	_	3	punct	_	_
3	B	B	PROPN	NNP	Number=Sing	0	root	_	SpaceAfter=No
4	,	,	PUNCT	,	_	5	punct	_	_
5	C	C	PROPN	NNP	Number=Sing	3	conj	_	_
6	and	and	CCONJ	CC	_	7	cc	_	_
7	D	D	PROPN	NNP	Number=Sing	3	conj	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 4 {#o4}

<!-- .ven lang=en -->
R, S, T and U

```conllu
# sent_id = question:biology:277-dna-simply-the-recipe-in-every-cell:e1:o4:1
# text = R, S, T and U
1	R	r	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
2	,	,	PUNCT	,	_	3	punct	_	_
3	S	S	PROPN	NNP	Number=Sing	1	appos	_	SpaceAfter=No
4	,	,	PUNCT	,	_	5	punct	_	_
5	T	T	PROPN	NNP	Number=Sing	3	conj	_	_
6	and	and	CCONJ	CC	_	7	cc	_	_
7	U	U	PROPN	NNP	Number=Sing	3	conj	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

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- ← previous: [DNA simply: the recipe in every cell, test 11](https://md.mova.elamur.ai/free/en/corpora/questions/biology/277-dna-simply-the-recipe-in-every-cell/t11/)
- next →: [DNA simply: the recipe in every cell, exam 2](https://md.mova.elamur.ai/free/en/corpora/questions/biology/277-dna-simply-the-recipe-in-every-cell/e2/)
- ↑ back to [DNA simply: the recipe in every cell](https://md.mova.elamur.ai/free/en/corpora/questions/biology/277-dna-simply-the-recipe-in-every-cell/)