A mutation results in an enzyme that is partially active compared to the wild-type allele. this type of "leaky" mutation is classified as

In general, when a substance changes from a solid to a liquid, A. the density of the substance remains the same. B. the substance no longer has density since density is a property only solids have. C. the density of the substance increases. D.

Which zone of a root tip increases the surface area for water and dissolved mineral uptake? A. root hair zone B. apical meristem C. elongation zone D. maturation zone

The most obvious reason why scientists still refer to viruses as non living is that they?

Which of the following statements best describes the termination of transcription in prokaryotes? A. RNA polymerase transcribes through the polyadenylation signal, causing proteins to associate with the transcript and cut it free from the

Which type of solution will cause cells to swell, or even to burst? (a) Isotonic solution (b) Hypotonic solution (c) Hypertonic solution (d) Osmotic solution

Friedman and Rosenman found that compared to Type As, Type Bs had higher rates of CHD compared to Type As, Type Bs had equal rates of CHD compared to Type Bs, Type As had higher levels of stress hormones compared to Type Bs, Type As had lower levels

How does the contractile vacuole in a single-celled organism function to maintain homeostasis? A) It pumps water into the cell. B) It pumps water out of the cell. C) It pumps solutes into the cell. D) It pumps solutes out of the cell.

Which of the following best describes the compositional layers of the earth? a. All layers of the Earth below the crust are liquid. b. The only liquid layer of the earth is the mantle. c. The crust floats on top of the outer core. d.

During the first stage of the cell cycle a cell 1 grows in size 2 divides in half 3 duplicate its genetic material 4 makes a copy of itself

Which organisms obtain energy from dear decaying matter