Keystone study, 1-12

(pg17) Plants are dependent on wat r. in most plants, water is absorbed by the root and then moves up the stem of the plants and into the leaves by capillary action. which properties of water are MOST responsible for the capillary action in plants A. adhesion and cohesion B. low density adhesion C. polarity and high specific heat D. high specific heat and cohesion

A

How does a mitochondrion facilitate the movement of some materials between cells? A. it supplies the beefy needed for moving molecules through membranes B. it manufactures the proteins needed to form channels in cell membranes C. it supplies digestive substance that break large molecules into smaller units D. it produces fibers that attach to molecules and move them though the cytoplasm

A

Which property of water is MOST responsible for plants being able to transport water from their roots to their leaves? A. The attraction between molecules B. A capacity to dissolve many substances C. the ability to form a low-density crystalline structure when frozen D. a capacity to absorb large amounts of energy as temperature increases

A

Which statement BEST describes a direct role of ATP in a paramecium? A. ATP provided the energy to move cilia B. ATP stores the genetic code for replication C. ATP signals the presence of other nearby organisms D. ATP senses changes in the surrounding aquatic environment

A

Each cell in the human body contains thousands of different enzymes responsible for regular reactions within the cell. Which statement explains why a single enzyme is unable to regulate a variety of reactions? A. a binding of a product and an enzyme is specific B. the binding of a substance and an enzyme is specific C. the enzyme is consumed by the products of the reactions D. the enzyme is consumed by the substrates of the reactions

B

Which process BEST describes the assembly of proteins from amino acids? A. atoms are linking to form a compound B. monomers are lined to form a polymer C. atoms are added to monomer until it becomes a polymer D. molecules are added to a compound until it becomes a monomer

B

Which statement BEST compares a carbohydrates and nucleic acid? A. the sequence of monomers in a carbohydrate stores genetic information and the bonds in a nucleic acid store energy B. the bonds in a carbohydrates store energy, and the sequence of nucleotides in a nucleic acid stores genetic information C. A carbohydrate had a unique structure to assist diffusion across a plasma membrane and a nucleic acid has a unique structure to assist chemical reactions D. a carbohydrate had a unique structure to assist chemical reactions and nucleic acid has a unique structure to assist diffusion actions a plasma membrane

B

Which statement BEST compares eukaryotic cells and prokaryotic cells A. Eukaryotic cells are smaller than prokaryotes cells B. Eukaryotic cells contain membrane- bound organelles, and prokaryotes cells do not C. Prokaryotes cells contain a distinct central organelle, and eukaryotic cells do not D. Prokaryotes cells are more complex than eukaryotic cells

B

Which statement BEST describes a function of the proteins embedded in the plasma membrane of cells? A. they provide instructions for the processes in the cell B. they selectively allow certain particles into and out of the cell C. they attract charges in the cell's environment to give the cell a net charge D. they store the energy required by the rest of the membrane to preform its functions

B

Lungs and capillaries both have porous lining that allow certain substance to move into it out of the structure. Which function do these porous linings MOST LIKELY serve in living organisms? A. heat release B. Carbohydrates absorption C. gas exchange D. Osmotic pressure regulation

C

Which of the following is essential to proper functioning of ALL prokaryotic and eukaryotic organisms? A. O2 B. Co2 C. ATP D. NaCl

C

The element carbon had multiple bonding patterns. which bonding pattern CANNOT be formed by carbon? A. C—C B. C-C-C C. C=C=C D. C =_ C =_ C=_

D