Evaluate and explain the importance of positional information and morphogens in induction
What will be an ideal response?
The general instructions cells follow in gastrulation get them into general position, but in order to produce the specific structures and organs of an animal's body, the cells have to have a sense of where they are and which way they should be going. The "where" is "positional information." Because cells cannot see, such information must usually be communicated chemically. Morphogens are one general category of chemical messengers that impart positional information and influence development of neighboring cells. Now the cells have more specific information about what genes need to be turned on and how they should grow.
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Tetanus is:
A. a muscle contraction of sustained force. B. a contraction caused by a single action potential. C. an abnormal muscle contraction. D. a contraction where the muscle does not change length. E. a contraction that slowly increases in force.
The mechanism that allows chromatin exchange during meiosis in eukaryotes is ________
Fill in the blank with correct word.
The oldest prokaryotic fossils have been dated to:
a. 1 billion years ago. b. 2 billion years ago. c. 4.6 billion years ago. d. 3.5 billion years ago. e. 2.5 billion years ago.
Classification.Respond to the following statements used by ecologists with reference to the five terms listed below:
A. The maximum number of individuals that a given habitat can support B. Movement of individuals out of a population C. Movement of individuals into a population D. This is a factor that causes a logistic growth pattern E. This limits population growth to the same degree regardless of population density.