The two elements associated with acid deposition are
a. nitrogen and oxygen.
b. sulfur and oxygen.
c. nitrogen and sulfur.
d. carbon and oxygen.
e. nitrogen and carbon.
Answer: c
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Fluorescence occurs when ____
a. a high-energy electron returns to its ground state by releasing energy in a photon b. a low-energy electron moves to a high-energy state by absorbing heat c. a high-energy electron leaves its nucleus and moves to a different molecule d. a pigment molecule accepts a high energy electron and releases a photon of energy e. the energy from an electron is transferred to a different molecule while the electron returns to the ground state
Darwin's observations led to his proposal that evolution occurred due to ____
a. acquired characteristics b. climatic changes c. natural selection d. migration e. interaction of species
The difference between vertical and horizontal transmission of plant viruses is that vertical transmission is _____
A) transmission of a virus from a parent plant to its progeny, and horizontal transmission is one plant spreading the virus to another plant B) the spread of viruses from upper leaves to lower leaves of the plant, and horizontal transmission is the spread of a virus among leaves at the same general level C) the spread of viruses from trees and tall plants to bushes and other smaller plants, and horizontal transmission is the spread of viruses among plants of similar size D) the transfer of DNA from a plant of one species to a plant of a different species, and horizontal transmission is the spread of viruses among plants of the same species
Two important contributions that cleavage makes to development are to
A) establish the basic tissues of the body and define the future nervous system. B) create a multicellular embryo and partition the embryo into developmental regions. C) create a multicellular embryo and establish the basic tissues of the body. D) establish the basic body plan and determine the location of the mouth and anus.