Some essential genes and DNA sequences in cells DO NOT encode for proteins but are still essential for cellular growth and replication. Give two examples of a gene or sequence of which this is true and explain why it is essential for growth or replication
What will be an ideal response?
Answer: Answers to this question could use many different examples such as rRNA and tRNA encoding genes. These genes are NOT translated into protein but are transcribed. The RNA that is made after transcription is the final end product that is critical for translation. Without rRNA or tRNA genes a cell would not be able to make new proteins or grow. Other essential DNA sequences are promoter sequences, ribosome binding sites, and termination sequences. Promoters and ribosome binding sites are never translated, but they are critical to the expression of all genes in a cell.
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In snapdragons, FR = red flowers and FW = white flowers. Plants heterozygous for flower color have pink flowers. A cross between two pink-flowered plants will produce ____ red-flowered plants.
A. 100% B. 75% C. 50% D. 25%
The bones that make up the digits of the hands or feet are known as the ________
A) phalanges B) carpals C) tarsals D) metatarsals
The process of clonal deletion is designed to
A) Destroy clones of lymphocytes able to react to self molecules. B) Slow down the immune system in the elderly. C) Slow down the primary immune response to an antigen. D) Limit the number of lymphocyte clones an individual has in order to make the system more efficient. E) Slow down the secondary immune response to an antigen.