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.

Why is ATP important in living organisms?a. It is easily converted to starch for long-term storage.b. It can transfer some of its energy to other chemicals.c. It is an important structural component of cell membranes.d. Like all other nucleic acids, it stores hereditary information.e. Like RNA, it acts as a source code for the formation of proteins.

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

Why does carbon form four covalent bonds? A)Because carbon has a high electronegativity .B)Because carbon needs four electrons to fill its outer shell. C)Because the most common isotope has four neutrons. D)Because carbon tends to give up four electrons to balance the charge of its protons. E)Because carbon has a low electronegativity.

 How is a polymer formed from multiple monomers?a. From the growth of the chain of carbon atomsb. By the removal of an —OH group and a hydrogen atomc. By the addition of an —OH group and a hydrogen atomd. Through hydrogen bonding

Our local group is composed of how many galaxies?

Stars to the upper right of the Hertzsprung-Russell diagram tend to be relatively

What is generally the range of a star’s hydrogen burning lifetime?

What determines if a star becomes a white dwarf, a neutron star, or a black hole?

“Cosmological Redshift” refers to