Gene regulation lecture summary
What will be an ideal response?
•Gene regulation provides a rapid and reversible strategy for dealing with changes to environmental conditions.
•Regulatory proteins can be used to both increase (sigma factors, activators) and decrease (repressors) transcription levels.
•Signals affecting regulation can interact directly with transcription machinery or indirectly through phosphorylation relays.
•Bacteria can use QS to census the biotic environment and control group-related activities, which may also be used to fight disease.
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Which statement best describes the phylogenetic relationship between protists, fungi, plants, and animals?
a. Fungi and animals share a common protist lineage, while plants arose from a different protist ancestor. b. Fungi and plants share a common protist lineage, while animals arose from a different protist ancestor. c. Animals and plants share a common protist lineage, while fungi arose from a different protist ancestor. d. Plants, animals, and fungi each arose from a different protist lineage. e. Plants, animals, fungi, and protists each arose from the same prokaryotic ancestor.
The region that divides a chromosome into two arms is the ______
A. centriole D. chromatid B. centromere E. centrum C. chromatin
Ozone in the ________ comprises a thin layer that protects the surface of Earth from ultraviolet radiation
Fill in the blank(s) with correct word
Approximately _____% of the energy at one trophic level is passed on to the next highest trophic level.
a. 0-5 b. 5-10 c. 10-15 d. 15-20 e. 90-100