Which does not increase blood pressure? increased venous return. increased total blood vessel length. increased heart rate. increased parasympathetic impulses. decreased blood vessel radius?

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer

Why has two different alleles for the same trait?