Identify which of the operon elements plays the most critical role in determining gene regulation in prokaryotes.
What will be an ideal response?
Answers may vary. The operon elements should include the following:
1. Regulator gene that codes for a DNA-binding protein that acts as a repressor.
2. Promoter is a short sequence of DNA where RNA polymerase first attaches to begin transcription.
3. Operator is a short sequence of DNA where an active repressor binds.
4. Structural genes that code for the enzymes and other proteins involved in the metabolic pathway.
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Functional traits can be shared between organisms with divergent SSU rRNA sequences because
A) functional traits may be lost by different lineages over time. B) functional traits may evolve independently in different lineages over time. C) horizontal gene transfer can result in the transfer of genes between divergent lineages. D) functional traits may evolve independently, be shared through horizontal gene transfer, or be lost in divergent lineages.
Tetany:
a. Vit B deficiency b. Vit D deficiency c. Mineral deficiency d. Vit C deficiency
By the early 1950s, many biologists realized that the key to understanding inheritance lay in the structure of
A) protein. B) chromosomes. C) ribosomes. D) DNA. E) enzymes.
The primary transmission route for acquiring agents of the common cold is by contact with hands and fomites contaminated with the nasal discharges of an infected person.
Answer the following statement true (T) or false (F)