Unit one Key are three

Question 1

Chemical element present in all proteins in addition to carbon, hydrogen and oxygen.

Answer 1

Nitrogen

Question 2

Weak chemical link holding a polypeptide chain in a coil.

Answer 2

Hydrogen bond

Question 3

Strong chemical link joining adjacent amino acids in a polypeptide chain.

Answer 3

Peptide bond

Question 4

Type of protein that acts as a chemical messenger.

Answer 4

Hormone

Question 5

Type of protein made by white blood cells to defend the body against antigens.

Answer 5

Antibody

Question 6

Type of protein possessing an active surface which combines with a specific substrate.

Answer 6

Enzyme

Question 7

Chain-like molecule composed of several amino acids.

Answer 7

Polypeptide

Question 8

Molecule composed of one or more polypeptides folded or coiled into a specific shape.

Answer 8

Protein

Question 9

Physical and chemical state of a cell or organism produced as a result of gene expression.

Answer 9

Phenotype

Question 10

One of twenty different types of organic compound which are the basic building blocks of a protein.

Answer 10

Amino acid

Question 11

Molecular language made up of 64 code words.

Answer 11

Genetic code

Question 12

Conversion of the genetic information on mRNA into a sequence of amino acids in a polypeptide.

Answer 12

Translation

Question 13

Process by which a complementary molecule of mRNA is made from a region of a DNA template.

Answer 13

Transcription

Question 14

Type of nucleic acid which carries a specific amino acid to a ribosome.

Answer 14

tRNA

Question 15

Type of nucleic acid which carries a copy of the DNA code from the nucleus to a ribosome.

Answer 15

mRNA

Question 16

Base present in RNA that is complementary to Adenine.

Answer 16

Uracil

Question 17

Sub-cellular structure of rRNA and protein which is the site of protein synthesis.

Answer 17

Ribosome

Question 18

Sugar present in RNA

Answer 18

Ribose

Question 19

Enzyme which controls transcription.

Answer 19

RNA Polymerase

Question 20

Triplet of bases on a tRNA molecule which is complementary to a mRNA codon.

Answer 20

Anticodon

Question 21

Unit of genetic information consisting of three mRNA bases.

Answer 21

Codon

Question 22

Coding region of a gene.

Answer 22

Exon

Question 23

Non-coding region of a gene.

Answer 23

Intron

Question 24

mRNA strand formed as the complement of a DNA template strand.

Answer 24

Primary transcript

Question 25

Region on a tRNA molecule to which a specific amino acid becomes temporarily fixed.

Answer 25

Attachment site

Question 26

Joining of exons from a primary transcript of RNA following removal of introns.

Answer 26

Splicing