You are sitting by a lake, you drop a leaf on the lake and notice that it floats on the top of the water, which of the following properties of water could help explain what you observe? A) It is more dense when liquid than when frozen. B) It can dissolve large quantities of solutes. C) It has a high specific heat. QUESTION 1
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You are sitting by a lake, you drop a leaf on the
lake and notice that it floats on the top of the
water, which of the following properties of water
could help explain what you observe? A) It is more dense when liquid than when
frozen. B) It can dissolve large quantities of solutes. C) It has a high specific heat. D) It has a strong surface tension. E) None of these can explain what you observe.
QUESTION 1
The formation of large, repetitive organic molecules from small monomers is a __________ reaction.
A) dehydration synthesis B) reduction C) dehydrogenation D) hydrolysis
QUESTION 2
Carbon is such an important molecule for life because:
A)it can form chemical bonds with a maximum of four other atoms.
B) it is part of the water molecule. C) it can hydrogen bond to so many molecules. D) it can be bonded ionically. E) it can form isomers.
QUESTION 3
Glycogen is a polysaccharide used for energy storage by:
A)moneraB)fungiC)plantsD)animals
QUESTION 4
QUESTION 5
Which of the following solutions has the greatest concentration of hydrogen ions (H+)?
A) gastric juice at pH 2 B) black coffee at pH 5 C) vinegar at pH 3 D) tomato juice at pH 4 E) household bleach at pH 12
Figure 5.19 A single amino acid substitution in a protein causes sickle-cell disease
Figure 5.19x Sickled cells
Diet: Essential Amino Acids
• 20 different amino acids
• All living things have protein
• 8 Essential Amino Acids can not be synthesized by our bodies - must be found in diet
• All 8 essential amino acids are present in animal protein and soy beans
Essential Amino Acids
Dietary Protein Consumption
Recommended Daily Allowances
Adult ManAdult Woman
(0.9g/kg)(0.8g/kg)
pounds/2.2 = kgTypical American Diet
Adult ManAdult Woman
92 g/ day60 g/ day
Which of the following is contains all 8
essential amino acids?
1. Wheat2. Soy beans 3. Brown rice4. Corn5. None of these
QUESTION
Lipoproteins & Glycoproteins
LIPOPROTEINS-Lipid + Protein-Used for transport of fats throughout the body
-Example: HDL and LDL Cholesterol
GLYCOPROTEINS-Carbohydrate + Protein-Receptors on the surface of cells
QUESTION
The myoglobin protein, which carries oxygen in muscle cells, only has the first three levels of protein structure (it lacks a quaternary level). From this you can conclude that myglobin:
a)Is made of nucleic acidsb)Is made of only one polypeptide chainc)Lacks hydrogen bondsd)Is not helical or pleatede)Is a fiber
• Nucleic acids include RNA and DNA
• Polymers made up of repeating monomers called nucleotides.
NUCLEIC ACIDS
Figure 5.x3 James Watson and Francis Crick
Figure 5.x4 Rosalind Franklin
Figure 5.27 X-ray crystallography
• 5-Carbon Sugar (Pentose): RNA ribose, DNA deoxyribose
• Phosphate Group
• Nitrogen-containing base
NUCLEOTIDES3 Main Components:
Nucleotides: Important Energy Storage Molecules
• Adenosine Triphosphate (ATP): acts like cell’s battery, providing energy for most activities.