b. a protein that acts as an enzyme to make mRNA from a DNA template c. a protei
ID: 134546 • Letter: B
Question
b. a protein that acts as an enzyme to make mRNA from a DNA template c. a protein that acts as an enzyme to make other enzymes from a DNA 6. What is RNA polymerase? a protein that acts as an enzyme to make protein IIO a. d. an enzyme used in apoptosis e an enzyme that helps DNA make more DNA What is a codon? 7. sequences of nucleotides encodes the information for a specific a triplet of nucleotides in mRNA that amino acid in a protein leotides in a tRNA molecule that pairs with a codon in a mRNA molecule a chemical link formed between amino acids the chemical subunits of amino acids d. e. 8. What are the building blocks of proteins? a. amino acids b. peptide bonds c. carboxyl groups d. neutrons e. diester bonds 9. How many different amino acids are found in proteins? a. 15 b. 20 C. d. 35 e. 40 10. What distinguishes amino acids from one another? a. different amino groups b. different acid group c. different R groups d. different hydrogen bonding e. none of these 11. What is the function of proteins within cells of different organisms? a. Provide structure. b. Act as receptors. c. Act as carrier molecules. d. Chemical messengers. e. All of these.Explanation / Answer
6. B
RNA polymerase is an enzyme which binds with DNA strand during the transcription process and by this process with the help of RNA polymerase enzyme, the single strand DNA is copied into precursors of several RNA types.
7. B
A codon is a particular sequence of three nucleotides (present on mRNA)which encodes different aminoacids or stop codon (specific for a particulat biological pathway). Whereas the anticodon is the set of three nucleotides present on tRNA.
8. A
Amino acids are building blocks of proteins. Amino acids consists of amine and carboxyl functional group along with side chain. Several amino acids are joined together by peptide bonds. Together they form polypeptide chain and inturn that forms proteins.
9. B
There are basic 20 amino acids. These are called essential amino acid. These are valine, leucine, isoleucine, alanine, glutamine, arginine, lysine, threonine, methionine,histidine, phenylalanine, tyrosine, aspertic acid, glutamic acid, proline, cysteine, tryptophan , asparagine, glycine, serine.
10. C
Every amino acid has similar amine and carboxyl group as functional group. They differ from each other only in the structure of side chain. That is called the R group which is attahced with the alpha carbon atom. They have different combination of hydrogen and carbon containing R groups as well as some of them even has sulfur in their R group.
11. E.
Protein serves for different structures. Like muscle protein builds the structure. G protein receptor helps in cell signaling. Water /glucose transporters are protein molecules. CMP is chemical messenger , etc. Protein is the most common biomolecule which serves for all of the above functions.
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