The focus of gene regulation in multicellular organisms is on:
a. operons.
b. the specificity of products in different tissues.
c. economizing resources at all levels.
d. rapid turnover of RNA molecules.
e. controlling the transcription of genes involved in resource use
B
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Describe how neutral, alkaline, and acidic solutions differ from each other.
What will be an ideal response?
What class of membrane-transport protein is associated with triggering an action potential?
A. a pump protein B. a ligand-gated ion channel C. a voltage-gated ion channel D. a sodium/potassium symporter
Vacuoles for ingesting food and regulating their water balance are characteristic of
A. spirochetes. B. sporozoans. C. ciliates. D. trypanosomes. E. algae.
A key difference between simple sugars and more complex sugars (disaccharides and polysaccharides) is that simple sugars:
A) must undergo some preliminary processing before the energy can be released from their bonds. B) are made up of one sugar unit or building block. C) have a particular molecular shape that does not stimulate the sweetness receptors on the tongue. D) are important sources of fuel for cells. E) can be broken down into different types of carbohydrate molecules.