Mei wants to study whether heart rate increases more during certain exercises than during others. she designs an experiment
to test the heart rates of classmates in the moming and in the evening for three days, immediately after doing jumping jacks
doing push-ups, or running in place. what is the dependent variable in this experiment?
o classmates
o type of exercise
heart rate
o time of day

Chicken pox and hepatitis are bacterial diseases. true or false?

Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen

Which statements about the fluid mosaic structure of a membrane are correct? select the three correct statements.which statements about the fluid mosaic structure of a membrane are correct? select the three correct statements.the framework of a membrane is a bilayer of phospholipids with their hydrophilic heads facing the aqueous environment inside and outside of the cell and their hydrophobic tails clustered in the center.because membranes are fluid, membrane proteins and phospholipids can drift about in the membrane.the diverse proteins found in and attached to membranes perform many important functions.the kinky tails of some proteins keep the membrane fluid by preventing the component molecules from packing solidly together.membranes include a mosaic, or mix, of carbohydrates embedded in a phospholipid bilayer.