A gene that codes for a protein that codes for a function other than gene regulation is a
1.regulatory gene.
2.constitutive gene.
3.structural gene.
4.RNA gene.
5.repressed gene.
3
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In cells with a normally functioning CFTR molecule, this molecule moves chloride ions (with
a negative charge) out of the cell to the covering mucus on the outside. Positively charged sodium ions then follow these chloride ions out of the cell to maintain electrical balance. This increases the total electrolyte concentration in the mucus, resulting in the movement of water out of the cell, and this water helps provide a fluid environment. People that have a defective gene (and thus a nonfunctioning CFTR molecule) produce abnormally thick and sticky mucus that builds up in the ducts and passageways. The buildup of this sticky mucus results in lifethreatening lung infections and serious digestive problems. Many charged particles such as ions cannot pass directly across the plasma membrane. Thus, passive transport of the chloride and sodium ions occurs via what process?
a. facilitated diffusion b. active transport c. bulk transport d. osmosis
When a molecule can dissolve readily in water is can be described as which of the following?
a. non-polar b. hydrophobic c. a solvent d. hydrophilic
Hypotheses are
a. often in the form of a statement. b. often expressed negatively. c. sometimes crude attempts to offer a possible explanation for observations. d. testable predictions. e. all of these.
Cajal bodies are sites of
a. RNA transcription. b. RNA processing. c. ribosome assembly. d. DNA replication.