A nucleotide consists of..... A.) One or more phosphate groups B.) A five carbon

Question

A nucleotide consists of.....

A.) One or more phosphate groups
B.) A five carbon-ribose sugar
C.) A nitrogen containing aromatic ring group (base)
D.) All of the above
E.) None of the above

Proteins are chiefly composed of which of thefollowing?
A.) Carbohydrates and amino acids
B.) Long non-branched amino acid polymers
C.) Peptide bonds formed between lipid moieties
D.) Aggregated amino acids
E.) A and B above

How a protein folds is determined by
A.) If the environment is hydrophobic or hydrophilic
B.) The location in the cell the protein is located
C.) The pH of the cytoplasm
D.) The order of the amino acids found in the sequence
E.) All of the above

The half-life of which of the following is likely to beshortest
A.) Protein
B.) Lipid
C.) Carbohydrate
D.) DNA
E.) RNA

Which of the following organelle has a double-membrane"envelope"?
A.) Nucleus
B.) Endoplasmic reticulum
C.) Mitochondria
D.) Plasma Membrane
E.) A and C

Poisons that kill an organism as a result of a loss ofhigh-energy ATP molecules, are most likely to target whichorganelle?
A.)Mitochondria
B.) Cytoskeleton
C.) Cytoplasm
D.) Endoplasmic Reticulum
E.) Nucleus

Explanation / Answer

Here are my thoughts:
1. D: those are all the components of anucleotide. http://dl.clackamas.edu/ch106-09/nucleoti.htm
2. B: the protein is a polypeptide chain. Carbohydrates arenot abundantly found in the protein structure. They are unbranchedsequences of amino acids, forming a long chain which folds in onitself to create the structure.
3. E: all of these factors can affect protein folding. I knowfor sure pH plays a role because proteins can denature inenvironments outside their acceptable limits, and the sequencesthemselves are important to form hydrogen bonds and disulfidebridges within the chain in the secondary and tertiarystructures.
4. C: I believe this is correct. Carbs would be easier tobreak down due to the condensed glycosidic linkages. All the othermolecules are relatively stable, and so their half-lives(spontaneous breakdown of the molecule) would be longer.
5. E: just from organelle structure
6. A: if there is a lack of high energy ATP molecules, thenthe poisons affect the mitochondria, where stable ADP molecules arephosphorylated to form high energy ATP molecules.
Hope this helps and please rate!

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