What is the most common population density pattern in habitats?
1.dispersed
2.random
3.migratory
4.clumped
4
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Which plane divides the body into upper and lower portions?
a. sagittal b. frontal c. transverse d. midsagittal
Describe the distinguishing organisms and major biological events associated with the following
geological time units. A. Precambrian time B. Paleozoic era C. Mesozoic era D. Cenozoic era What will be an ideal response?
To which amino acid is nitric oxide added, altering the activity, turnover and/or interactions of proteins like hemoglobin, Ras, ryanodine channels and caspases?
a) methionine b) cysteine c) asparagine d) phenylalanine e) alanine
Why do Na+ ions enter the cell when voltage-gated Na+ channels are opened in neurons?
A) because the Na+ concentration is much lower outside the cell than it is inside B) because the Na+ ions are actively transported by the sodium-potassium pump into the cell C) because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are attracted to the negatively charged interior D) because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are actively transported by the sodium-potassium pump into the cell