Ihich of these is the best definition of

density?

A. the amount of space an object takes up

B. the amount of mass in a given space

c. a measure of the force of gravity on an object

D. the sum of all physical properties of a substance

Which is most effective as a barrier for polar substances

A retrovirus a. is a primitive virus. b. has a genome made of RNA. c. has the simplest of all protein coats. d. was discovered before any other virus.

Heart: Rearrange the following order for the circulation of the blood starting from left atrium. vena cava, left atrium, aorta, lungs, pulmonary artery, right atrium, pulmonary vein, right ventricle, left ventricle

Which of the following is not true if deciduous forests

Why can oxygen diffuse across a cell membrane but a protein cannot

Which enzyme assembles the complementary nucleotide bases during replication? RNA polymerase RNA ligase DNA polymerase DNA ligase

HURRY! The cell membrane is selectively permeable because of its molecular structure. Based on this, which one of these would NOT diffuse directly through the cell membrane?

Freud believe that certain troubling symptoms could be traced to painful unconscious memories. This led him to suspect that these symptoms resulted from

Reducing the volume of a gasits pressure if the temperature of the gas and the number of particles are constant.

Salt deposits form on a car in the winter. Over time, the salt covers more of the car. Is the salt alive? a. Yes, salt deposits are alive because they maintain their structure. b. No, salt deposits are not alive because they do not reproduce. c.