DNA BIOLOGY AND TECHNOLOGY (5) Flashcards Preview

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Flashcards in DNA BIOLOGY AND TECHNOLOGY (5) Deck (12):
1

DNA

-double stranded helix
-composed of a series of nucleotides
-backbone(sugars and phosphates on the outside of the molecule)
-paired bases( making up the inner part of the molecule)
-complementary base pairing (A-T OR T-A)( C-G OR G-C)
-found in nucleus

2

functions of DNA

1. replicates so that it can be transmitted to the next generation
2. stores into
3. undergoes mutations that provide genetic variability

3

RNA

-single strand structure of DNA
-composed of nucleotides
-sugar phosphate backbone
-four nitrogenous bases- uracil is substituted by thymine (A-U OR U-A) (G-C OR C-G)
-polynucleotide that functions during protein synthesis
-DNA helper
-found in nucleus and cytoplasm

4

function of RNA

- ribosomal RNA
-messenger RNA
-transfer RNA

5

proteins

composed of subunits (amino acids)

6

20

how many different amino acids

7

function

shape of protein determines its

8

hemoglobin

blood protein

9

plasma proteins

albumins and globulins are

10

actin and myosin

are proteins of muscles responsible for contraction

11

transcription

a segment of DNA strand that serves as a template for the formation of mRNA

12

translation

tRNA molecules bring amino acids to the ribosomes where polypeptide synthesis occurs