Bio test

Ovalbumin is a protein found in eggs. What describes the molecular structure of ovalbumin?

A chain of amino acids folded and twisted into a molecule

How do enzymes speed up by chemical reactions?

By lowering the activation energy

A florist places a bouquet of white carnations in water containing blue dye. After a time, the flowers turn blue. What process helped the carnations to change color?

Cohesion and adhesion of water molecules

What are the functions of proteins?

Control rate of reactions/regulate cell processes

What type of macromolecule is proteases?

Enzyme

The human body maintain the temperature of around 98.6° at all times. Enzymes are involved in almost every chemical reaction in the body. What is the connection between these two statements?

Enzymes function best at a specific temperature

What is the function of nucleic acid's?

Function to store and transmit hereditary/ genetic info

What macromolecule makes up the majority of the cell membrane?

Lipid

Water has a much higher specific heat than most other covalent compounds. What do you predict my happen if water had a low specific heat instead?

Organisms that are sensitive to changes in the temperature would die

Water is often called The "Universal Solvent" because many substances can be dissolved in water. What properties of water allowed to be such a versatile solvent?

Polarity and cohesion

Many plants have waxy coating is on some services. This coding reduce his water loss because it is not water permeable. This waxy coating is what type of organic molecule?

Polymers of smaller subunits

In living organisms, lipids function mainly as:

Sources of stored energy and components of cellular membranes

What is the function of lipids?

Store energy/form important parts of biological membranes

What are the functions of carbs?

Store/release energy

Heat capacity

The amount of energy needed to raise its temperature by making water molecules move faster

Adhesion

The attraction between molecules of different substances

Cohesion

The attraction between molecules of the same substance

The optimum pH of the enzyme is 6.6

The graph below shows how the activity of an enzyme changes over a range of pH values. What can be drawn from this graph?

Small insects can walk across the surface of Kolmar. Their feet push the surface of the water down slightly somewhat like a person walking across the trampoline, but they do not break the surface four. What is the best explanation for why this happens?

The insects are light enough so that they do not break the hydrogen bonds holding the water molecules together

Why are enzymes necessary for many cellular reactions?

The reactions are too slow to meet the needs of the cell if enzymes are missing

Water is essential for life. It's special properties make water the single most important molecules and plant life. What property of water enables it to move from the roots to the leaves of the plant?

Water exhibits cohesive behavior

Many fish and aquatic plants can survive a cold winter because the layer of ice that forms at the top of the lake insulates the water below it prevents the lake from freezing cold. What are unique properties of water contribute to this effect?

Water expands and becomes less dense when it freezes

Large bodies of water, such as lakes and oceans, do not fluctuate in temperature. What is the reason for this phenomenon?

Water has a high heat capacity

List and describe the three properties of water:

Water is a polar molecule, it is able to form multiple hydrogen bonds, which account for many of water special properties; cohesion/adhesion/heat capacity

Enzyme

What is another name for the substance labeled catalyst?

Amino acids

What is the building block of structure G?

Nucleotide

What macromolecule is not identified on the cell membrane above?

Maria, after finding no cold sodas in the refrigerator, place a can of soda in the freezer.She then proceeded to check her social networking site and forgot about the soda. Later that evening her brother went to get some ice in it was brown. Maria soda can has split open. What is the best explanation for what happened?

When the water froze, the space between hydrogen molecules expanded