Which of the following is an example of how a scientist might use a model?

marbles placed inside a hollow sphere are used to describe protons in a nucleus.

microscopes are used to magnify a group of cells on sets of slides.

a wrench is used to tighten a nut onto a piece of wood.

stopwatches measure the amount of time it takes for runners to complete a mile

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.)

You can tell from this karyotype that the individual is female because the karyotype has two chromosomes labeled

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b. diffusion c. endocytosis d. exocytosisc. endocytosis