What can gene chips be used for?
A. To examine patterns of protein expression under various environmental conditions
B. To establish levels of genetic variation
C. To determine the mass of a gene
D. To identify the amount of a specific transcription factor in a cell.
B
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The endosymbiosis that formed mitochondria likely occurred after eukaryotes developed photosynthetic capabilities
Indicate whether the statement is true or false.
Synapse in which neurotransmitters decrease the chance of an action potential on the postsynaptic cell. _____ 2) Synapse in which neurotransmitters allow sodium to enter the postsynaptic cell. _____ 3) A specific type of neuron that conducts information toward the brain and spinal cord from a sensory receptor. _____ 4) The junction between a neuron and another cell. _____ 5) The short branching projections of a neuron, which provide surface area for sending and receiving signals from other cells. _____
A) Inhibitory synapse B) Synapse C) Sensory neuron D) Synaptic knobs E) Dendrite F) Axon G) Motor neuron H) Interneurons I) Ion channels J) Excitatory synapse
The hole in the ozone layer is primarily due to
A. burning coal. B. CFCs in the upper atmosphere. C. automobile exhaust. D. use of non-CFC aerosols.
Greenhouse gases include
A) nitrous oxide and oxygen. B) nitrogen and oxygen. C) carbon dioxide and nitrogen. D) carbon dioxide and methane.