Cell membranes are fluid, and thus proteins can diffuse laterally within the lipid bilayer. However, sometimes the cell needs to localize proteins to a particular membrane domain
Name three mechanisms that a cell can use to restrict a protein to a particular place in the cell membrane.
Any combination of the following four answers is acceptable.
1. The protein can be attached to the cell cortex inside the cell.
2. The protein can be attached to the extracellular matrix outside the cell.
3. The protein can be attached to other proteins on the surface of a different cell.
4. The protein can be restricted by a diffusion barrier, such as that set up by specialized junctional proteins at a tight junction.
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Which statement is true?
a. Biome changes resulting from increased altitudes are similar to biome changes resulting from increased longitudes. b. The biomes found at each specific elevation are essentially identical regardless of where they are found on Earth. c. Isolated geographic regions may be home to many unique species. d. Endemic species originate in environments hostile to most other life.
The process in which one or more nucleic acid molecules are rearranged or combined to produce a new nucleotide sequence is called ________.
A. conjugation B. recombination C. transformation D. transduction
What is a primary location for the type of tissue in the accompanying figure?
a. lining of the digestive tract b. within blood vessels c. dermis of the skin d. respiratory passages e. air sacs of the lungs
The chromosomes line up in the middle of the cell during
A) prophase. B) anaphase. C) metaphase. D) telophase. E) prophase II.