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AQA AS LEVEL BIOLOGY, with all 100 questions and correct detailed answers(verified answers) newest exam 2024| already graded a+|just released!! $10.99   Add to cart

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AQA AS LEVEL BIOLOGY, with all 100 questions and correct detailed answers(verified answers) newest exam 2024| already graded a+|just released!!

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AQA AS LEVEL BIOLOGY, with all 100 questions and correct detailed answers(verified answers) newest exam 2024| already graded a+|just released!!

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  • October 15, 2024
  • 59
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • aqa as level biology
  • AQA AS LEVEL BIOLOGY,
  • AQA AS LEVEL BIOLOGY,
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AQA AS LEVEL BIOLOGY, with all
100 questions and correct
detailed answers(verified
answers) newest exam 2024|
already graded a+|just
released!!




what is RNA? - Ans-ribonucleic acid


MRNA and TRNA


single stranded


shorter


AU CG

,what are biological molecules? - Ans-molecules made and used by
living organisms eg. lipids, carbs, DNA, AT, water, inorganic ions




what are the functions of carbohydrates? - Ans--energy source
(respiration)


-energy store (starch and glycogen)


-structure (cellulose)
what are fibrous proteins? - Ans-insoluble, inflexible and strong eg.
keratin




how do amino acids differ? - Ans-have different r groups




what is a chromosome? - Ans-coiled DNA


formed during interphase

,made of 2 sister chromatids joined by centromere


2 copies of same DNA molecule




what is a homologous pair of chromosomes? - Ans-1 maternal 1 paternal


same genes but different alleles




how are amino acids joined? - Ans-condensation reaction between
carboxyl group and amine group. leaves bond between carbon and
nitrogen, DIPEPTIDE




primary structure of a protein? - Ans-sequence of AA, polypeptide
chain. change in sequence, bonds will be formed in different places in
secondary.


secondary structure? - Ans-primary structure coils to form an alpha
helix, hydrogen bonds form between amino acids

, tertiary structure? - Ans-secondary structure folds again to form final 3d
shape, held by ionic/hydrogen/disulfide bonds




quarternary structure? - Ans-more than one polypeptide chain, non
protein can be involved




quarternary structure examples? - Ans-haemoglobin, antibodies,
collagen




collagen structure? - Ans--strong


-primary structure glycine


-secondary tight coil


-tertiary coils again

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