Compare and contrast the structure and functions of three of the following four intercellular junctions:desmosomes
, gap junctions, tight junctions, and plasmodesmata. What will be an ideal response?
Desmosomes consist of discs associated with plasma membranes of adjacent cells. These junctions
cement cells together and provide potential pathway for signal transmission.
Tight junctions are tight connections between plasma membranes, and they seal body cavities.
A gap junction bridges the space between cells. Gap junctions connect cell and form a communication
system.
Plasmodesmata are functionally equivalent to animal gap junctions
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Which of the following is NOT an example of
the results of mitosis? a. a pair of identical twins b. a group of rooted plant cuttings from a single plant c. the cells produced by the asexual reproduction of a single-celled organism d. production of a gamete e. healing of a wound
In peas, the round allele is dominant over the wrinkled allele. A plant with round peas was crossed to a plant with wrinkled peas and all of the resulting plants had round peas. What is the genotype of the parents in this cross?
A) RR × rr B) RR × Rr C) Rr × rr D) Rr × Rr E) rr × rr
The highest percentage of non-coding DNA is found in:
a. genes. b. bacteria. c. eukaryotes, with the exception of yeasts. d. viruses. e. yeasts
Multiple sclerosis is a nervous system disorder that arises when white blood cells mistakenly attack and destroy:
a. neurons b. ganglia c. myelin d. neuroglial cells e. nerves