What type of bonding is likely to occur between two water molecules or strands of DNA? A. covalent B. ionic C. hydrogen D. both hydrogen and covalent E. both hydrogen and ionic

To observe the three-dimensional structure of a cell the best type of microscopy would be A. fluorescence microscopy. B. standard light microscopy. C. scanning electron microscopy. D. differential-interference light microscopy. E. transmission electron microscopy.

For which of the following organelles are the structure and function correctly described?A) Endoplasmic reticulum—a network of interconnected membranes forming sacs and canals that makes and packages protein molecules for secretionB) Ribosomes—membranous vesicles containing digestive enzymesC) Golgi apparatus—particles, composed of protein and RNA, which synthesize proteinsD) Mitochondrion—non-membranous structure that synthesizes proteins

Plasma membranes are a feature of A. all cells. B. prokaryotic cells only. C. eukaryotic cells only. D. plant cells only. E. animal cells only.

Whether a molecule can cross the plasma membrane depends upon A. the size of the molecule.B. the shape of the molecule.C. the chemical properties of the molecule.D. the charge of the molecule.E. All of the choices are correct.

What happens when an animal cell is placed into a hypertonic solution? A. plasmolysisB. crenation occurs (shrinkage)C. it swellsD. it is unchanged

The key structural difference between DNA and RNA is A. RNA is a protein, while DNA is a nucleic acid. B. RNA is a polymer, but DNA is not. C. DNA contains a different sugar than RNA. D. RNA is a double helix, but DNA is not. E. All the bases in DNA differ from those in RNA.

 Living organisms are characterized by: A. adapting to the environment.B. evolving over time.C. displaying homeostatic controls.D. all of the choices pertain to living organisms.

Which of the following concepts is NOT one of the unifying theories of biology? A. All organisms are composed of cells.B. Life may arise through spontaneous generation.C. Life comes only from life.D. Organisms contain coded information that dictates their form, function, and, at times, behavior.E. All living things have a common ancestor and are adapted to a particular way of life

If a segment of DNA has 20% adenine in its base composition, what percent thymine is there? A. 20%B. 80%C. 60%D. 30%