Biology, CLEP Questions and Answers Graded A+

Biology, CLEP Questions and Answers Graded A+ What is the key limiting factor on cell size? The size of a cell is limited by the ratio of its surface area to volume. A cell will only remain stable if... ...the surface area of the plasma membrane maintains a balance with the volume of the cytoplasm. The salivary gland... ...secretes saliva which enters the digestive tract and aids the digestive process. Gregor Medel Studied the relationships between traits expressed in parents and offspring and the genes that caused the traits to be expressed. In order to become an established part of an island ecosystem there must be... ...a populations large enough to ensure successful reproduction, a food source, a suitable habitat, and a source of moisture. Lymphocytes Are cells involved in immunity and are produced in bone marrow as stem cells. B Cells Produce antibodies into the bloodstream that find and attach themselves to foreign antigens (toxins, bacteria). T Cells Some patrol the blood for antigens, but are also equipped to destroy antigens. They may regulate immune responses as well. Mass extinctions promote diversification... ...because ecological niches open up, making conditions favorable for the establishment of new, diverse species. Common elements found in proteins are Carbon, Hydrogen, Oxygen, and Nitrogen What phylum are snakes in? Chordata Cellular Respiration is the process that releases energy for use by the cell. A hydrogen bond is weaker than ionic, covalent, disulfide, or double bonds. A hydrogen bond involves the attraction of atoms of different polarity and can be easily broken. Ionic bonds involve the transfer of electrons. Covalent bonds share electrons. Chimpanzees are more closely related to Homo Sapiens than to other apes, but Homo Sapiens did not evolve from chimpanzees. About five million years ago... ...the lineage that led