In an operon, the switch that controls mRNA synthesis is the promotor, which is a sequence of bases upstream from

the first structural gene.
__________________ Indicate whether the statement is true or false.


False - operator

Biology & Microbiology

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Most cells are small. When they reach a certain size, cells typically divide. This has to do with the

a. amount of genetic material. b. surface-to-volume ratio. c. inability to produce more components of the cell membrane. d. fact that they cannot possess sufficient numbers of organelles for normal cell functioning. e. differences between viral particles and eukaryotic cells.

Biology & Microbiology

____ have a body temperature similar to that of their surroundings

a. Endotherms b. Ectotherms c. Mice d. Humans e. Birds

Biology & Microbiology

When you eat a bag of cookies, your blood sugar level increases. As blood sugar levels rise, insulin levels increase to move the sugar into the cells and lower the blood sugar level. As the blood sugar level drops, so does the level of insulin

This is an example of A) positive feedback. B) negative feedback. C) neurotransmitter activity. D) paracrine communication. E) synaptic communication.

Biology & Microbiology

The limbic system in the central nervous system sustains many vegetative functions in mammals and is closely associated with structures that process cues about _____

A) olfaction B) vision C) audition D) mechanosensation

Biology & Microbiology