-
In what stage of mitosis do all chromosomes align in one plane?
--metaphase
-
A cell in interphase is sometimes said to be resting. Which is this misleading?
--interphase cells are synthesizing RNA and protein and growing is size
-
Which is not found in a plant cell?
--lysosomes
-
The network of fibers that helps the cell maintain its shape and give support to the cell is called the
--cytoskeleton
-
In most cases protein kinases:
--add phosphate groups to proteins
-
L-glucose, D-glucose and fructose are examples of?
--isomers
-
Which of the following statements concerning unsaturated fats are correct?
--they have double bonds in the carbon chains o their fatty acids.
-
The tertiary structure of a protein is typified by the?
--Three dimensional shape of an individual polypeptide caused y the bonding between R groups
-
Which is a type of interaction that stabilizes the alpha helix structure of proteins?
--hydrogen bonds
-
Which element is found in both nucleic acids and all proteins?
--nitrogen
-
Polysaccharides, nucleic acids, and proteins are all polymers synthesized from monomers b?
--The removal of water from each pair of monomers.
-
Which of the following descriptions best fits the class of molecules known as nucleotides?
--Five carbon sugar, a nitrogenous base and a phosphate group.
-
The disaccharide maltose is composed of two molecules of glucose inked by a:
--alpha 1-4 bond
-
The bond(s) responsible o primary protein structure is/are?
--Peptide.
-
Water plays a role in many cells. Which of the following is NOT a property of water?
--It dissociates completely into H+ and OH-
-
Glucose and hexanoic acid which contain 6 carbon atoms, but they have completely different properties. Glucose is necessary for food; hexanoic acid is poisonous. Their differences must be due to different?
--functional groups
-
A molecule that has all nonpolar covalent bond would be:
--hydrophobic
-
In a group of water molecules, hydrogen bonds form between:
--The oxygen atom in one molecule and a hydrogen atom in another molecule.
-
Which of the following statements about primers used in PCR is not true:
--they complement the DNA of the same strand of the template.
-
Which end of the PCR primer can be extended by polymerase?
--the 3� end
-
The lock and key hypothesis attempts to explain the mechanism of?
--enzyme specificity.
-
A catalyst is a substance which:
--increases the rate of a chemical reaction but itself unchanged by the reaction
-
The alpha helix, beta sheets are examples of the
--secondary structure
-
The class of enzymes that split peptide bonds or glucosidal bonds wither water is
--hydrolyses
-
When the bond that produces the tertiary structure of a protein is disrupted by agents such as heat, acid or heavy metal ions, this process is known as?
--denaturation
-
If a compound is a competitive inhibitor
--the addition of more substrate reverses the inhibition
-
Which structure is only found in animal cells?
--centrioles
-
The ______________destroys worn out cells or cell organelles. Sometimes this is called the �suicide sac�. This sac contains hydrolytic enzymes for this purpose.
--Lysosomes
-
Amanda is viewing cells using a light microscope. In her observations, she vies a nucleus and a cell wall. Which additional organelles is she most likely to observe using the light microscope in this observation?
--chloroplast
-
Cyanide, a metabolic poison, interferes with the cellular aerobic production of ATP. Which cell organelles does cyanide most directly influence first in this situation?>
--mitochondria
-
Semiconseravative replication of DNA means
--A single strand of DNA is copied to make two single strands of DNA.
-
DNA replication begins at a specific site called the
--origin
-
Which of the following are limitations of DNA polymerase?
--it can only add bases it the exposed 3� end of a pre-existing strand
-
Which of the following is requiring for DNA replication to occur?
- --DNA helices
- --DNA polymerase
-
Okazaki fragments form during DNA replication because
--The DNA molecule is ant parallel
-
What is the significance of selective permeability to biological membranes?
- --selective permeability allows the plasma membrane to control traffic
- into and out of the cell it surrounds.
- --selective permeability allows
- cells to concentrate particular ions on either side of the
- membrane.
- --selectively permeability prevents toxic materials from
- entering the cell
- --selective permeability permits the selective uptake
- of nutrients and the elimination of wastes.
-
What is the first step in the process of DNA replication?
Helicases must unwind (break) the bonds between base pairs.
-
Which if the following statements concerning membrane proteins are incorrect?
--they are not particular about what types of chemicals they will allow to cross the membrane.
-
The major classes of membrane lipids are?
- ---phospholipids
- --glycolipids
- --sterols
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