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People with lactose intloerance produce insufficient amounts of ________________.
The Enzyme Lactase
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The large Diversity of Biological molacules is possible because of the extensive presence of _____________.
Carbon
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Hydrocarbons are organic molacules that contain only_______________.
Carbon and Hydrogen Atoms
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Variations in the properties of different organic molecules are most closley associated with _______________.
the presence ofr absence of functional groups
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A dehydration reaction is the process in which____________
water molecules are formed when polymers are synthesized from monomers.
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Which of the following pairs of molacules share the same chemical composition but differ in molecular structure?
glucose and fructose
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What is the main sugar use by cells for energy?
Glucose
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Glucose plus fructose forms a disaccharide called
Sucrose
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Plant cell walls consist mainly of ___________
cellulose
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The charateristic that all lipids have in common is that____________.
non of them dissolves in water.
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Some fats are called "saturated" fats because ____________.
all carbons in the carbon skeleton contain the maximum number of hydrogen atoms.
-
The building blocks of protiens are called __________.
Amino Acids
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A polypeptide is a long chain of amino acids bonded together by________________.
peptide bonds
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The linear sequence of amino acids in a polypeptide is called its___________ Structure.
Primary
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The building blocks of amino acid molacules are called_____________.
nucleotides
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A specific stretch of DNA that programs the amino acid sequence of a polypeptide is callled a ___________.
gene
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A shortage of phosphorus in the soil would make is especially difficult for a plant to manfacture_______________.
DNA
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Two strands of DNA double helix are held together by __________that form between pairs of nitrogenous bases.
hydrogen bonds
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A nucleotide is composed of a(n) ____________.
phosphate group,a nitrogen-containing base,and a five-carbon sugar.
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The Secondary Structure of a protein results from__________.
Hydrogen Bonds
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Tertiary Structure is NOT directly dependant on ____________.
peptide bonds
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Which one of the following represents the correct sequence of information flow in a cell?
DNA to RNA to Protein
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If a strand of DNA has the nitrogen base sequence ATTTGC, what will be the sequence of the matching strand.
TAAACG
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If a DNA double helix is 100 nucleotide pairs long and contains 25 adenine bases,how many guananine bases does it contain?
75
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Defensive protiens are manufatured by the _____________ system.
Immune
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What type of bond joins the monomers in a protiens primary structure?
Peptide
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A functional cholesterol that does not harm is its role ___________.
as a compnent of animal cell membranes.
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which of these is a source of lactose?
milk
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Which of these is a polysaccharide?
cellulose
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_____________ is the most abundant organic compound on earth.
Cellulose
-
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How many hydrogen atoms can conect to a carbon atom?
up to 4 covalent bonds.
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In the space filling model of a molecule, the shape of each atomis depicted as a ___________.
sphere
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Glycogen is __________.
a polysaccharide found in animals.
-
glucose+glucose-> _________by ______.
maltose+water = dehydration synthesis
-
What is cellulose?
A carbohydrate- it consists of carbon,oxygen, and hydrogen.
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An important characteristic of the double-stranded DNa molacule is that __________.
Hydrogen bonding between base pairs is responsible for formation of a double helix.
-
One difference between DNA and RNA is that ___________.
DNA uses the bases CGAT whereas RNA uses the bases CGAU
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As a result of experimentation on lactose-intolerant individuals, scientists foun that____________.
a small change in DNA nuucleotide sequence can have a major effect on the production of the lactase.
-
As a reseult of studying lactose intolerance in people from different geographic regions, scientist were able to determine that____________.
Natural selection could favor anyone with a mutation for a permanentlly active lactasae gene.
-
1 meter = ______ Centimeters
100
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__________ are surface appendages that allow a bacterium to stick to a surface.
Pili
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What is the function of a bacterium's capsule?
Protection
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The DNA containing region of a bacterial cell is the____________.
Nucleated Region
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Where is a bactierial cell's DNA found?
nucleoid region
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in a bacterium, where are protiens syntheesized?
Ribosomes
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What name is given to the rigis sturcture, found outside the plasma membrande, that surrounds and suports the bacterial cell?
Cell Wall
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The _____ is the bacterial structure that acts as a selective barrier, alloing nutrients to enter the cell and wastes to leave the cell.
Plasma Membrane
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What kind of cells have cell walls and organelles?
Plant Cells
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True of False: the large centtral vacuole, chloropasts and cell wall are found in animal cells?
False
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