Binding of a signaling molecule to which type of receptor leads directly to a change in the distribution of ions on opposite sides of the membrane?
A) receptor tyrosine kinase
B) G protein-coupled receptor
C) ligand-gated ion channel
D) intracellular receptor
C
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Which would be the best way to directly test the hypothesis that
C. stellatus (a species of barnacle) is competitively excluded from the lower intertidal zone by B. balanoides (another species of barnacle)? A) Place individuals of each species in a jar and see which species survives. B) Remove all B. balanoides from the lower intertidal zone. C) Transplant B. balanoides to the upper intertidal zone. D) Clear rocks in an entire area and document recolonization events. E) Remove all C. stellatus from the upper tidal zone.
Mutations are permanent changes in a cell's DNA base sequence. They typically have negative consequences, but they are also the original source of genetic variation and the raw material of evolution. How can mutations accumulate, given that cells have repair systems that fix changes or breaks in DNA strands?
What will be an ideal response?
Where are abscisic acid receptors located in plant cells?
a. cell wall b. cytoplasm c. endoplasmic reticulum d. plasma membrane e. nucleus
Unsaturated fatty acids:
A) are usually found in animal fats. B) have long been linked with heart disease. C) contain the maximum number of hydrogen atoms possible. D) have one or more double bonds between the carbons.