If lactose and glucose are present, will the lac operon be on or off?
What will be an ideal response?
on
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The common garter snake is a predator of the rough-skinned newt. These newts produce a
potent neurotoxin that is concentrated in their skin, but garter snakes have evolved resistance to this toxin.
This is an example of __________.a. natural selection b. sexual selection c. coevolution d. natural selection and coevolution
All EXCEPT which of the following may be
pathogens today? a. viruses b. bacteria c. fungi d. smallpox e. protozoans
Before cell division of somatic cells, each chromosome must be replicated. After replication, the resulting two parts of each chromosome are held together by cohesin at the centromere. These two parts are referred to as:
A. Sister chromatids B. Daughter chromosomes C. Genes D. Homologous chromosomes E. Kinetochores
In multiple sclerosis, a victim:a
loses coordination due to the replacement of myelin with scar tissue. b. accumulates neurofibrillary tangles in the brain resulting in dementia. c. suffers tremors due to overly rapid and spontaneous firing of neural impulses. d. is unable to transmit neural impulses because poisons interfere with the action of the ion pumps. e. suffers depression due to abnormal secretion of neurotransmitters