Knowing the atomic number for an element is very useful because
A. It tells us the number of protons, and thus the element
B. It can be used to determine the number of neutrons
C. It can be used to determine the number of electrons
d. All of the above
Ans: d. All of the above
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The organism Caenorhabditis elegans, a member of the ____ phylum, is an important model organism for studies of
the genetic control of development.
a. Arthropoda b. Onychophora c. Nemertea d. Annelida e. Nematoda
What is the main difference between leukemias and lymphomas?
A) In leukemias, malignant cells are mainly located in the tissues. B) Lymphomas are present mainly in peripheral blood. C) Lymphomas arise due to a lack of response to stimulating antigens. D) Lymphomas arise mainly in lymph nodes, the spleen, or other lymphoid tissue.
Plants called legumes have chambers in their roots that house nitrogen-fixing bacteria. Nitrogen-fixing bacteria get both a place to live and energy while supplying nitrogen to a plant. What is this ecological relationship called?
A) Competition B) Parasitism C) Succession D) Predation E) Mutualism
As energy is transferred to the next trophic level, how much of it is generally lost as heat?
A. None. B. 5 % C. 50 % D. 10 % E. 90 %