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Bio HW 1 Final Answers

Bio HW 1 Final Answers - Homework#1 Biology Is Summer 2013...

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Homework #1, Biology Is Summer 2013 Name: Kyle Silver Place your name and answers onto your scantron and name on your question set. Turn in your scantron, keep your question set. Only your scantron will be graded but write answers and notes on your question set to aid your recall of and selection of your answers. I will provide your scored, scantron in a short time. 1) In an experiment scientists attempt to determine a variable (or factor) exerts a significant influence on another variable that is also the one being measured for its response. Although many variables may exert an influence onto the variable being measured, a good, clean experimental design will isolate one _____________________ variable to test while others will be controlled. a) hypothesized b) dependent c) independent d) predicted e) control 2) Organisms do not exist as a smaller entity than a _____________; this unit possesses all the characteristics of life. a) molecule b) cell c) nucleus d) element e) proton 3) There are 92 naturally occurring ______________ on Earth. All life forms and all natural, non-living things are composed of these fundamental units of matter. a) molecules b) cells c) nuclei d) elements e) protons 4) The typical valence of carbon is ___________. This is also the typical number of covalent bonds carbon forms in organic molecules. a) 1 b) 2 c) 3 d) 4 e) none of these 5) Which of the elements has the highest electronegativity? a) S b) O c) N d) H e) P ab) C 6) Covalent bonds are more likely to occur between elements with _______________ electronegativities. a) similar, near to equal b) different, furthest from equal 7) Ions are variations of atoms where the ions of the neutral atom vary in ________________. 8) Molecules of water have charge poles (actually partial positive and partial negative poles), consequently water molecules ______________________ bond with each other. a) hydrogen b) ionic c) covalent d) magnetic e) polar covalent 9) Molecules repelled by water, such as an oil, are exhibiting a ___________________ response. a) hydrophilic b) hydrophobic c) van der Waals d) nuclear e) radioactive 10) All aqueous solutions, such as the environment within cells (the cytoplasm), have water as the ___________________.
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