Lipids are important to biological systems because

Question 1

1. Lipids are important to biological systems because

   Answer

   		they are solid at body temperature so they stabilize membranes
   		some lipid types are potentially large sources of energy to perform cellular work.
   		most help to buffer aqueous solutions in the body.
   		all lipids are very soluble in water.

1 points

Question 2

1. Sucrose is an oligosaccharide made up of which of the following sugars?

   Answer

   		glucose and glucose
   		deoxyribose and ribose
   		starch and glycogen
   		maltose and glucose
   		glucose and fructose

1 points

Question 3

1. Which of the following is not a property of water?

   Answer

   		is composed of polar molecules
   		is a liquid at room temperature
   		holds heat energy
   		is a biological solvent for polar molecules
   		consists of molecules attracted to each other by covalent bonds

1 points

Question 4

1. “Blind” experiments are designed to reduce the possibility that the outcome of an experiment might be affected by the power of suggestion.

   AnswerTrue

   False

1 points

Question 5

1. The validity of a prediction in the scientific method is determined by experimentation or observation.

   AnswerTrue

   False

1 points

Question 6

1. In science, graphs are often used to display data collected from an experiment. Which of the following is true regarding a graph?

   Answer

   		Most graphs are plotted on three axes.
   		The dependent variable is plotted on the x-axis.
   		Independent variables may include age or time.
   		The horizontal axis is known as the ordinate.
   		Graphs always involve plots of individual data points.

1 points

Question 7

1. DNA differs from RNA in that DNA:

   Answer

   		is single stranded.
   		contains deoxyribose.
   		is made up of nucleotides.
   		contains cytosine.
   		contains phosphates.

1 points

Question 8

1. Pancreatic cells make insulin, which is a type of protein. These cells use ________ in order to synthesize insulin by the process of ________.

   Answer

   		oligosaccharides, hydrolysis.
   		nucleotides, condensation.
   		amino acids, dehydration synthesis.
   		fatty acids and glycerol, hydrolysis.
   		monosaccharides, dehydration synthesis.

1 points

Question 9

1. Which of the following is true regarding electrons, shells, and energy?

   Answer

   		Electrons are located in shells around the nucleus.
   		Electrons are attracted to each other because they have the same charge.
   		In order for an electron to move closer to the nucleus, it must absorb energy.
   		The innermost electron shell has the most potential energy.
   		As an electron moves to a shell further from the nucleus, it loses energy.

1 points

Question 10

1. Because carbon requires four additional electrons to fill its outermost shell, it has a natural tendency to form four covalent bonds with other atoms, making it an ideal element for forming structures in living cells.

   AnswerTrue

   False

1 points

Question 11

1. Which of the following is not a molecule?

   Answer

   		CO2
   		H2O
   		NaCl
   		C
   		H2

1 points

Question 12

1. Each amino acid is composed of a central carbon that forms covalent bonds with four other atoms/molecules. These atoms/molecules include all but a(n):

   Answer

   		R group.
   		A group.
   		amino group.
   		hydrogen atom.
   		carboxyl group.

1 points

Question 13

1. A molecule of water forms when one oxygen binds with two hydrogen atoms, completely filling the outershell of the hydrogens and oxygen. The type of bond linking the atoms together is

   Answer

   		polar
   		covalent
   		hydrogen
   		ionic
   		disulfide

1 points

Question 14

1. Peer review is essential to the scientific process because

   Answer

   		It ensures that the findings from experimentation are scrutinized for accuracy
   		it is the primary means for informing other scientists of new information in the field
   		the process can lead to improvements in articles prior to being published
   		the process immediately validates any hypothesis tested in the experiments
   		both A and C

1 points

Question 15

1. The more buffers present in a body fluid, the less stable the pH will be.

   AnswerTrue

   False