biology

biology 111 exam 3 flash cards

54 cards·by khnm1198

Lactose is composed of one glucose molecule joined by a glycosidie linkage to on galactose molecule. How is lactose classified?

as a disaccharide

Lipids...?

are insoluble in water

Which pairs of amino acids would carry a negative charge on their sides chain at ph 8?

Aspartate and Glutamate

Which of the following is an essential amino acid?

Tryptophan, Mehtionine, Lysine

Which of teh following is not an essential acid?

Aspartic acid, Glutamic acid, Glycine

A molecule with the chemical formula C6H12O6 is probably a...?

monosaccharide

Biological evolution of life on Eath, from simple prokaryote-like cell to large multicellular eukaryotic organisms,...?

has caused an increase in emthropy of the planet

on which of the molecules would you find a condon

mRNA

When the amino acid alanine (r-group is CH3) is added to a solution with a pH of 7.3 aline becomes

a zitterwion

The isoelectric point of an amino acid is defined as the pH

where the molecule carries no electric charge

Molecule that bear charged groups of opposite polarity are know as...?

zwitterions

To which of the following does Thymine form hydrogen bonds in DNA?

Adenine

All of the following are polysaccharides EXCEPT

lactose

Phospholipids and truglycerides both...?

have a glycerol backbone

An essential amino acid is one that...?

the body can not synthensize

The sulphur containing side chain of cysteine is...?

hydrophobic, highly reactive and capable of reacting with another cysteine

Serine and theronine are polar amino acids due to...?

reactive hydroxyl group in the side chain

Which of the following statements about amino acids is correct?

amino acids are classified according to the structures and properties of their side chains

The sugar in RNA is ...., the sugar is DNA is...?

ribose, deoxyribose

Nucleoside is a pyrimidie or purine base

contently bonded to a sugar

They glycosidic bonds in DNA and RNA

connect the sugar to the base

A nucleotide consists of

a sugar, a base, and a phosphate

a five carbon sugar lacking a hydrogen at the number two carbon is found in

DNA

What is found in RNA but not DNA

Uracil

A lipid is formed by the canden sation reactions between

Fatty acids and Alcohol

When nucleotides polymerize to form a nucleic acid

a covalent bond forms between the sugar of one nucleotide and they phosphate of a second

Which of the following is true for all exergonic reactions

the reactions proceeds with a net release of free energy

The two strands of double helix is held together by

hydrogen bonds between the purines and pyramidine bases of the respective linear molecules

Lipids that form membranes have what kind of structure?

Polar heads and nonpolar tails, the polar heads interact with water

Why is ATP an important molecule in metabolism?

It provides energy coupling between exergonic and endergonic reactions

Which of the following are purine hitrougerous base

guanine and adenine

If a DNA was composed of 10% thyine, what would be the percentage of guanine?

40%

Which of the following statements is wrong regarding lipids?

Lipids are insoluble in Ethanol and lipids are insoluble in coloroform

Lipids are important constituents of...?

Biological membranes

Which of the following is a devived lipids

steroides

fats consist of ...?

glycerol molecule linked by ester bonds to three faty acids

Which of the following includes all of the pyrimidines found in RNA and DNA

cytosine, uracil, and thymine

Which of the following is a disaccharide...?

maltose, lactose, surcose

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin Cycle

ATP and NADPH

What oxygen is released as a result of photosynthesis it is direct by product of?

splitting water molecules

Which of the following is a statement of the first law of thermodynamics

energy can not be created or destroyed

what is the main purpose of light dependent reaction of photosythesis?

to produce NADPH and ATP

surcose is made up of ...?

glucose and fructose

Which of the events listed below occurs in the light reactions of photosynthesis?

light is absorbed and funneled to reactions center chlorophylla

what is the difference between NAD+ and NADP?

both functions as electron carriers but NADP has a phosphate group

Whenever energy is transformed, there is always an increase in the....?

entropy of the universe

What is the electron source that helps reduce carbon dioxide to sugars and other organic molecules?

NADPH

Nuclecic acid are polymers made up of which of the following monomers?

nucleotides

what is the difference between a ribonucleotide and a deoxyribbonnucleotide?

Ribonucleotides have a hydroxyl group on the two carbon of their sugar submit

Which of the following descriptions best gits the class of molecules known as nucleotides?

a nitrogen base, a phosphate group, and a sugar

Which of the following statements is a logical consequence of the second law of thermodynamics?

Every chemical reactions must increase the total entropy of the universe

What are the variable structures of a nucleotide?

the sugar and the base

Which of the following is an example of potentical rather than kinetic energy?

a molecule of glucose

Which of the following are pyrimidine nitrogenous base?

cytosine and uracil