WorksheetsSnadvig Test Review (Turning Point)
Total questions: 21
Worksheet time: 11mins
The movement of particles from an area of higher concentration to an area of lower concentration is
homeostasis
diffusion
dynamic equilibrium
brownian movement
Which of the following best describes a covalent bond?
Protons are gained or lost
Electrons are gained or lost
Electrons are shared
Protons are shared
What causes water to creep up thin tubes?
Water has high surface tension
Water has a high heat of vaporization
Water expands when it freezes
Water has an attraction for itself and for other molecules
The compound HCI gives off hydrogen ions in water. What type of compound is HCI
An acid
A base
A buffer
A salt
Which of the following is NOT associated with lipids?
glycerol
saturated fatty acids
unsaturated fatty acids
nucleic acids
A calcium atom has 20 electrons. When it reacts, it loses two electrons. how does this make calcium more stable?
It will then have an equal number of electrons and protons
Its outer shell is now empty and the next lower level is full
Losing two electrons will make calcium neutral
It becomes a different isotope
At which enzyme concentration does all of the available substrate react with the enzyme?
0.3 mg/ml
0.15 mg/ml
0.22 mg/ml
0.05 mg/ml
Which of the following occurs when a solute reaches dynamic equilibrium in a solvent.
The solute stops moving
The solute disappears
The solution is static
The particles keep moving
What is the purpose of glycogen in muscle cells?
Muscle cells use glycogen to make actin and myosin proteins
Muscle cells use glycogen to stimulate contraction
Muscle cells need glycogen to secrete hormones
Muscle cells break down glycogen to provide energy for contraction
Under which conditions is enzyme A most effective?
35 C and pH 2.8
40 C and pH 3
40 F and pH 7
40 C and pH 6.8
The optimum environment for enzyme B is?
A basic medium
An acidic medium
A neutral medium
Either acidic or basic
During the winter, ice floats on lakes. How can a solid float on a liquid?
As ice forms, the molecules expand making the ice less dense than cold liquid water.
Ice has large air pockets, so it will always float on water.
All molecules that form crystalline structures are less dense than liquids.
Water molecules take up less surface area as they freeze
How many total atoms are involved in the following equation?
4
6
7
12
Whirligig beetles are small insects that are able to walk on the surface of water. What factor allows them to do this?
Water is repelled from a whirligig beetle's body, so the beetle does not sink
Whirligig beetles have air pockets on their feet
Water attracts to itself, forming a surface tension "film" on top of the water.
Whirligig beetles 'are less dense than water
What is the function of stored starch in potatoes?
It provides food for animals.
IT stores the food for seed production
It stores the energy captured during photosynthesis
It provides food for photosynthesis
A cellulose molecule consists of 100 monosaccharides. How many water molecules would it take to completely hydrolyze the cellulose into the 100 monosaccharides?
None, cellulose cannot be hydrolyzed
50 water molecules
99 water molecules
100 water molecules
Temperature, ionic conditions and the pH of surroundings all affect the rate at which these proteins catalyze chemical reactions.
Surface proteins
Enzymes
DNA
Cyclo-pentane ring
What are the basic building blocks of proteins?
Nucleic acids
Peptide bonds
Amino acids
Glycerol and fatty acids
Number of atoms
Arrangement of atoms
Kinds of atoms
Arrangement of electrons
Which of the following would yield the most energy per gram when oxidized
Starch
Glycogen
Proteins
Fats
Most _____ (i.e. polysaccharides, nucleic acids, proteins, lipids) in cells and organisms are synthesized from a collection of simple precursors
Macromolecules
Monomers
Microscopy
Mutations
