Exam (elaborations)
AQA AS LEVEL BIOLOGY, ALL Questions and answers. Latest Update 2023.
- Course
- Institution
AQA AS LEVEL BIOLOGY, ALL Questions and answers. Latest Update 2023.
[Show more]
Seller
Follow
abram23
Reviews received
Content preview
AQA AS LEVEL BIOLOGY, ALLQuestions and answers. Latest Update 2023.
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)
ATP structure? - Ans-1 adenosine 3 phosphates
ADP and energy= ATP
condensation reaction using ATP synthase
carries energy in bonds
hydrolysis breaks down into ADP and energy using ATP hydrolase
releases energy from phosphate group bonds
,what are the building blocks of carbohydrates called? - Ans-monosaccharides
why is ATP a good source of energy? - Ans-immediate release, only need to break one bond
releases small amounts of energy at a time, manageable
examples of monosaccharides - Ans-glucose, fructose, galactose
uses of ATP? - Ans-protein synthesis
organelle synthesis
dna replication
mitosis
active transport
metabolic reactions
movement
homeostasis
formula for monosaccharides? - Ans-c6h12o6 -same formula but arranged differently
role of water in biology? - Ans-acts as a habitat for organisms
make up cytoplasm, tissue fluid, blood, xylem and phloem
water properties? - Ans-dipolar
,partially positive hydrogen partially negative oxygen
so separate water molecules form hydrogen bonds with eachother
difference between alpha and beta glucose? - Ans-on carbon 1, alpha glucose has an OH group on the
bottom. beta glucose has it at the top.
how are monosaccharides joined together? - Ans-condensation reaction between 2 OH groups
roles of water? - Ans--habitat, high shc so a lot of heat needs to be applied before evaporation due to
hydrogen bonds. ice is less dense than water so floats up
-solvent, dipolar so separate solutes by charge depending on partial charge. solute dissolves in water,
useful for cytoplasm, diffusion and active transport ect
-hydrostatic pressure, when pressurised, water provides a strong pushing force particularly in mass flow.
supports turgidity
-homeostasis, sweat on skin uses blood heat to evaporate, cooling individual. sweat is made up of
hydrogen bonds,stable structure, large amount of heat to evaporate. LATENT HEAT OF EVAPORATION.
bond in carbohydrate? - Ans-glycosidic
what are inorganic ions? - Ans-salts or minerals
don't contain carbon
eg sodium and chloride ions
examples of disaccharides - Ans-sucrose, lactose (glucose + galactose), maltose (glucose + glucose)
, kingdoms of biology? - Ans-animal, plant, bacteria, fungi, protocista
animal and plant multicellular
others are microorganisms
viruses aren't living
all organisms made up of cells
eukaryotic vs prokaryotic - Ans-eukaryotic - membrane bound organelles eg. nucleus
prokaryotic - no membrane bound organelles, smaller ribosomes
formula for disaccharides? - Ans-c12h22o11
what are the 2 forms of reproduction? - Ans-sexual- 2 parents each provide gamete which fuse to make
zygote which develops into organism
asexual- one parent to produce genetically identical offspring
how are polymers separated? - Ans-hydrolysis (addition of water)
how does a zygote develop into an organism? - Ans-stem cell, undifferentiated
divides by mitosis to make more stem cells
each cell differentiates into specialised
each specialised divides by mitosis to make tissues
different tissues for organ, and so on
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller abram23. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
48298 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 15 years now