Multiple choice will mark brainliest
read the following statements that describe what happens as an impulse travels. what is the correct order in which the steps occur?
1) the impulse continues to travel down the axon away from the cell body.
2) na+ gates close and k+ ions flow back out of the cell restoring the resting potential.
3) gated k+ and na+ channels are closed. the inside of the cell is slightly negative compared to the outside.
4) the neuron receives a stimulus great enough to start an impulse.
5) gated na+ channels open. the net movement of na+ ions into the cell produces the action potential.
a. 4,5,3,1,2
b. 1,5,3,4,2
c. 3,1,5,4,2
d. 3,4,5,1,2

The dna in a cell’s nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell. for example, consider these two proteins: phosphofructokinase (pfk) is an enzyme that functions in the cytoplasm during glycolysis. insulin, a protein that regulates blood sugar levels, is secreted from specialized pancreatic cells. assume that you can track the cellular locations of these two proteins from the time that translation is complete until the proteins reach their final destinations. for each protein, identify its targeting pathway: the sequence of cellular locations in which the protein is found from when translation is complete until it reaches its final (functional) destination. (note that if an organelle is listed in a pathway, the location implied is inside the organelle, not in the membrane that surrounds the organelle.)

Identify characteristics of energy from the sun. check all that apply. almost all of the energy on earth comes from the sun. energy from the sun is known as mechanical energy. the energy in fossil fuels originally came from the sun. plants convert the energy of sunlight into chemical energy.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a. one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b. one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c. one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.