1201 Chap 2 Q - 1201 Self-quiz Questions on chapter 2 1 An element is to a(an as a tissue is to a(an A Atom organism B Compound organ C Molecule

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1201 Self-quiz Questions on chapter 2 1. An element is to a(an) _________________ as a tissue is to a(an) __________. A. Atom, organism B. Compound, organ C. Molecule, cell D. Atom, organ E. Compound, organelle A is incorrect. An atom is the basic subunit of an element, not the other way around. An organism is made up of many different kinds of organs that are composed of different kinds of tissues. B is the correct answer . Remember compounds are substances composed of one or more elements. Organs are composed of one or more types of tissues. In this answer the relationships in both halves of this statement are stated correctly. C is incorrect. Elements are not made up of molecules. Compounds are made up of molecules. Tissues do not make up cells. Tissues are made up of cells. D. The first half of this answer combination is not correct. Elements do not make up atoms. E. Compounds are composed of elements and a tissue is composed of cells but an organelle is just one small component of each individual cell. This question is an example illustrating the hierarchy of structure in biological organisms. It iindicates how each new level builds upon the preceding level and that in each higher level, new and different physical and chemical properties are emerging. 2. In the term “ trace element ,” the modifier “trace” means: A. The element is required in very small amounts. B. The element can be used as a label to trace atoms through an organism’s metabolism. C. The element is very rare on earth. D. The element enhances health but is not essential for the organisms’s long- term survival. E. The element passes rapidly through the organism. A is the correct answer. Trace means that this element is required in very minute quantities – in the human body it makes up less than 0.01% by weight of the naturally occurring elements. Compare the recommended daily intake of 1000 to 1500 milli grams for calcium which is not a trace element to the 100
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
micro grams per day for the trace element selenium. (And even the “experts” don’t completely agree on the recommended amount of selenium. Some think that 100 µ g is too high.) B is incorrect. This is a use for radioactive isotopes. A radioactive isotope of Iodine is an excellent diagnostic tool for a study of the thyroid gland. A radioactive isotope of fluorine is attached to glucose and used in Positron Emission Tomography (PET scans) of the human brain. Tritium, the radioactive isotope of hydrogen, is routinely used in research to follow the effects of substances on cells. Blastogenesis studies, for example, analyze the ability of cells to survive and divide. The tracer for this is tritium. For other cell studies, the tracer can be a radioactive isotope of carbon. You get the picture. You also remember that different isotopes of an element are different atomic forms of the same element. All isotopes of an element have the same atomic number. They have the same number of protons in the nucleus of the atom; the same number of electrons orbiting the atom and differ only in the number of neutrons in the nucleus of the atom.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/08/2010 for the course BSC 2010 taught by Professor Bio during the Fall '10 term at Florida State College.

Page1 / 10

1201 Chap 2 Q - 1201 Self-quiz Questions on chapter 2 1 An element is to a(an as a tissue is to a(an A Atom organism B Compound organ C Molecule

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online