Distinguish between segmentation genes and homeotic genes
What will be an ideal response?
Segmentation genes define the number, size and polarity of each segment while homeotic genes specify the developmental fate of cells within each segment.
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Mr. Johnson was becoming slightly deaf. To test his hearing, his doctor held a vibrating tuning fork tightly against Mr. Johnson's jaw. This sent vibrations through the bones of the skull, setting the fluid in the cochlea in motion. Mr. Johnson could hear the tuning fork this way, but not when it was held away from the skull a few inches from his ear. Where was the hearing problem most likely to
be? A. auditory cortex of Mr. Johnson's brain B. auditory nerve leading to Mr. Johnson's brain C. hair cells in the cochlea D. tympanum or the bones of the middle ear E. fluid of the cochlea
Answer the following statements true (T) or false (F)
1.Homeostasis could be disrupted by drugs which affected any of: sympathetic division, parasympathetic division, hypothalamus. 2.A typical neuron consists of a cell body, dendrites, and an axon. 3.A neuron must reach threshold potential before an action potential begins. 4.Unmyelinated regions between adjacent myelin sheath cells are called synaptic clefts. 5.The connection point between an interneuron and a motor neuron is a synapse.
What is the role of the F factor in bacterial recombination?
What will be an ideal response?
Which statement below characterizes metabolic pathways?
A. They are random sequences of reactions. B. They are always biosynthetic. C. They are always degradative. D. They are enzyme-mediated sequences of reactions. E. They are always linear reactions.