BIO SCI 93 Lecture 2: BioSci 93 Lecture 2

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indigohorse647

18 Oct 2018

School

UC-Irvine

Department

Biological Sciences

Course

BIO SCI 93

Professor

WOOD, M., GREEN, K., BUSCIGLIO, J

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BIO SCI 93 Lecture Notes - Lecture 1: Golden Ratio, Homeostasis

BIO SCI 93 Lecture 2: BioSci 93 Lecture 2

BIO SCI 93 Lecture Notes - Lecture 3: Cell Nucleus, Hydrolysis, Glycerol

Document Summary

Elements: can t be broken down into other substances. 92 elements, 25 which are essential for life. 96% of living matter is c, o, n, h. Compound: molecule of two or more elements in a fixed ratio. Hydrogen bond: the h atom forms a covalent bond and a second weaker bond with a different atom. Ice has more distance between hydrogen bonds, making it less dense. Cohesion helps water travel up the tree against gravity, hydrogen bonds stick together and pull each other. When a solute is put into a solvent, the water molecules (solvent) surround dissolved ion in hydration shell, dissolving it. Affinity for water: polar or ionic bonds that can form hydrogen bonds with water. Hydrogen ion (h+) and hydroxide ion (oh-) Buffers: resist change in ph of a solution (keep constant) Chemical processes of cells are sensitive to ph changes. Donate hydrogen ions when there is not enough in solution (acids)

Related Questions

Circle the word of phrase that correctly completes the sentece or answers the question. The property that allows water molecule to be attracted to each other is called (cohesion, adhesion). This propert is conferred by (covalent bonds, hydrogen gonds). This property is conferred by ( covalent bond, hydrogen bond). Ice is ( more dense, less dense) than liquid water. Water is polar molecule because of the unequal sharing of( electrons, protons) between the atoms in H2O. Adhesion of water to a surface is through the action of (covalent bond, ionic bonds, hydrogen bonds) between the water and the surace. Water is converted from liquid to vapor through the brakage of ( colvalent, hydrogen) bonds. Which (one) of these substance is not hydrophilic:( cellulose, oil, NaCl). Which of these will not dissolve in water, even though it is polar?(cellulose, oil, NaCl). Which of these is an electrolyte? (cellusose oil, NaCl). A buffer will contain a week acis , weak base, both).

Fill in the following chart with the appropriate subatomic particle and state whether each is located in the nucleus of the orbital

Particle	Charge	Location (Nucleus or Orbital)
	Positive (+)
	Negative (-)
	Neutral Charge

Fill in the following chart using the lowercase letter of the statements below. Please be aware that some letters should be used more than once because they are true for more than one type of bond.

Covalent Bonds	Ionic Bonds	Hydrogen Bonds

Electrons are transferred from one atom to another atom

Valance electrons are shared between atoms

Involves positive and negative ions

A weak bond between 2 or more polar molecules

A bond between 2 or more atoms

The type of bond used to make NaCl (table salt)

The type of bond used to make CH₄ (Methane)

What does it mean when a molecule is described as âpolar?â Be detailed in your answer.

State and explain two reasons that water molecules are essential to life because of their hydrogen bonds.

Fill in the chart with the missing information about macromolecules

Macromolecule	Dietary source	Function	Example	Defining Characteristics
Carbohydrate			Cellulose and glucose
Lipid	Fats, Oils
Protein
Nucleic Acid	Sardines, beans, spinach			Made of nucleotides (contain a base, sugar and phosphate)

greydinosaur410

The type of macromolecule found in highest concentration on a weight basis in a HeLa cell is

protein.

lipid.

polysaccharide.

nucleic acid.

water

Co and Zn ions are required by humans in

microgram amounts.

gram or near gram amounts.

kilogram amounts.

d. milligram amounts.

Which description best characterizes the length of a hydrogen bond between water molecules?

About the same length as the calculated van der Waals distance for two water molecules.

About the same length as a covalent O----H bond.

Shorter than a covalent O---H bond.

Longer than a covalent O---H bond, but shorter than the calculated van der Waals distance between water molecules.

Which of the following statements about water is not true?

Water will hydrogen bond into highly ordered structures or "cages" around non-polar molecules.

The electron-rich oxygen atom of one water molecule can interact with an electron-poor hydrogen on another water molecule to form a hydrogen bond.

Water is a key player in the energetics of the hydrophobic effect.

In an ice crystal water molecules pack into open lattices consisting of five-membered oxygen rings.

At 25 degrees celsius liquid water is about 85% as hydrogen bonded as the water in ice, with each molecule in an average of 3.4 hydrogen bonds.

Which of the following is the strongest?

Ionic interactions

Permanent dipole - permanent dipole interactions

London dispersion forces

Co-linear hydrogen bonds

Which of the following is the best explanation for the hydrophobic effect?

It is caused by the attraction of hydrophobic groups for each other.

It is an entropic effect caused by the tendency of hydrophobic groups to increase their entropy by associating with other hydrophobic groups.

It is an entropic effect, caused by the tendency of water molecules to increase their entropy by excluding hydrophobic groups, which they must otherwise surround with highly ordered structures.

It is caused by the attraction of water for hydrophobic groups.

It is an entropic effect, caused by the tendency of water molecules to increase their entropy by forming highly ordered structures around the hydrophobic groups.

Which of the following is NOT defined as a buffer? (pKa PIPES-H⁺ = 6.76; pKa MOPS-H⁺ = 7.15; pKa HEPES-H⁺ = 7.47)

0.15 M MOPS, pH 6.50

0.05 M HEPES-H⁺ / 0.04 M HEPES

0.20 M PIPES, pH 7.97

0.01 M HEPES, pH 7.30

BIO SCI 93 Lecture 2: BioSci 93 Lecture 2

BIO SCI 93 Lecture Notes - Lecture 1: Golden Ratio, Homeostasis

BIO SCI 93 Lecture 2: BioSci 93 Lecture 2

BIO SCI 93 Lecture Notes - Lecture 3: Cell Nucleus, Hydrolysis, Glycerol

Document Summary

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