25. A cell has 20 amino acids. How many molecules of tRNA are in the cell? 1. Four
2. Three
3. More than 20
4. At least twenty
5. Fifteen
6. I do not know.​

Idont understand by supporting the plant and holding the leaves up to the light. question 3 options: tap or fibrous root flower petals herbaceous or wood stems leaves with stomata

Which statement best describes the relationship between an allele and a gene? question 1 options: an allele is a variation of a gene that can be expressed as a phenotype. an allele is the part of a gene that attaches to messenger rna molecules. an allele is a segment of a dna molecule that controls replication of a gene.

What are some possible short and long term medical concerns for crew members on longer space exploration trips