Exam 1, 2 & 3 Bio 121 Review Questions and Correct Answers
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Course
BIO 121
Institution
BIO 121
A covalent chemical bond is one in which ... Outer - shell electrons of two atoms are shared to satisfactory fill the valence
Difference between covalent bonds and ionic bonds Covalent bonds involve the sharing of bonds between atoms. Ionic bonds are electrical attraction - positively and negative...
Exam 1, 2 & 3 Bio 121 Review Questions
and Correct Answers
A covalent chemical bond is one in which ... ✅Outer - shell electrons of two atoms are
shared to satisfactory fill the valence
Difference between covalent bonds and ionic bonds ✅Covalent bonds involve the
sharing of bonds between atoms. Ionic bonds are electrical attraction - positively and
negatively charged
Which bond or interaction would be least likely to dissociate(break up) when a
compound is put into water? ✅Hydrogen and ionic bonds
- Least likely is covalent bonds -
Biological evolution of life on Earth, from single prokaryote-like cells to large,
multicellular eukaryotic organisms... ✅has occurred in accordance with the laws of
thermodynamics
Carbon on the periodic table. How many covalent bonds do you think an atom of
nitrogen is likely to form? ✅3
Most similar to sodium in regard to chemical reactivity ... ✅potassium
Liquid water's high specific heat is mainly a consequence of the ... ✅absorption and
release of heat when hydrogen bonds break and form
Type of bond that must be broken for water to vaporize ... ✅Hydrogen bond
Why does ice float in liquid water ? ✅Hydrogen bonds stabilize and keep the
molecules further apart
A fish swimming in salt water ... ✅- Fish's cells will be constantly losing water to the
environment via osmosis
- Fish will likely have active transport to transport salt
One liter of a solution of pH 2 has how many more hydrogen ions than 1 liter of a
solution of pH 6 ? ✅10,000 time more
A beaker has 100 ml of NaOH at pH 13. Pours 10 ml of HCL at pH 1. What are the
results of the mixing? ✅The pH of the beaker's contents will fall
, NOT a correct statement regarding enzymes ... ✅Enzymes INCREASE the activation
energy of reactions in living cells
NOT a polymer ... ✅Glucose
A molecule with the chemical formula C6H12O6 is probably a ... ✅Carbohydrate and
monosaccharide
Lactose (sugar in milk), is composed of one glucose molecule joined by a glycosidic
linkage to one galactose molecule. How is lactose classified? ✅As a disaccharide
NOT True about saturated fats? ✅They have multiple double bonds in the carbon
chains of their fatty acids
Hydrogenated vegetable oil is a major ingredient. What is the result of adding hydrogen
to vegetable oil? ✅Stays solid at room temperature
Particular polypeptide was found to contain 100 amino acids. How many peptide bonds
are present? ✅- 99 (always have one less)
Aspects of protein structure are stabilized or assisted by hydrogen bonds ... ✅Not
primary - but secondary, tertiary and quaternary
Filed of view on a microscope is said to be 4mm at 40X magnification. Approx. size?
✅.1 cm
Tertiary structure of a protein ? ✅Unique three-dimensional shape of the fully folded
polypeptide
Normal hemoglobin is a tetramer, consisting of two molecules of B hemoglobin and two
molecules of hemoglobin. In sickle-cell disease, as a result of a single amino acid
change, the mutant hemoglobin tetramer associate with each other and assemble into
larger fibers. Based on this information alone, we can conclude that sickle-cell
hemoglobin exhibits ... ✅Altered primary and quaternary structure
Which of the following descriptions best fit the type of molecules known as nucleotides ?
✅A nitrogenous base, a phosphate group and pentose sugar
Not apart of a prokaryotic cell ... ✅an endoplasmic reticulum
The evolution of eukaryotic cells most likely involved ... ✅endosymbiosis of an aerobic
bacterium in a larger host cell - evolved into mitochondria
Where does glycolysis takes place in eukaryotic cells ? ✅Cytosol
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