BIOLOGY AS

  • Created by: hsn._13
  • Created on: 05-08-18 15:38
what are the two types of nitrogen containing bases
purine and pyrimidines
1 of 26
what are the two types of polypeptide chains in a haemoglobin
alpha chains and beta chains
2 of 26
properties of water
1.they are unusual and excellent solvent 2.has high surface tension 3.the water molecules are amphoteric
3 of 26
what are the main functions of the blood?
1. transport digested food products 2.transport food molecules 3.transport excretory products 4.transport chemical messengers 5.helps o maintain steady body temperature
4 of 26
whats the steps of blood clotting mechanism?
first the damaged tissues release platelets which releases thromboplastin, this catalyses the conversion of prothrombin to thrombin which inturn catalyses the conversion on fibrinogen to fibrin
5 of 26
what are the 4 protein structures?
1.primary 2.secondary 3.tertiary 4.quaternary
6 of 26
lifestyle factors which affect CVD
smoking, weight, exercise, stress and diet
7 of 26
what are the types of epithelial tissues?
simple squamous, cuboidal, columnar, ciliated, glandular, compound stratified
8 of 26
what are the phases of mitosis?
PROphase - Metaphase - Anaphase - Telophase
9 of 26
what are the strategies/ways of asexual reproduction?
binary fission, producing spores, regeneration, budding, vegetative propagation, parthenogenesis
10 of 26
what are the 3 aspects of growth?
1.cell division 2.assimilation 3.cell expansion
11 of 26
what is Spermatogenesis and oogenesis?
Spermatogenesis isthe formation of sperms and oogenesis is the formation of ova
12 of 26
what is the difference between micro- and megagametogenesis?
microgametogenesis produces pollen grain while megagametogeness produces ova in plants
13 of 26
what changes happen in ovum to avoid polyspermy?
1. cortical granules release and form fertilisation membrane with zona pelusida 2. electrical charges in the ovum membrane changes
14 of 26
methods of artificial fertilisation
1. In Vitro Fertilisation (IVF) 2. artificial insemination
15 of 26
properties of stem cells
they are totipotent and later change into pluripotent
16 of 26
what are the sources of stem cells?
1. embryo stem cells 2. umbilical stem cells 3. adult stem cells 4. stem cell theraphy
17 of 26
what are the stages of embryo development?
gametes - fertilization - zygote - blastomere - morular (16 cell stage) - blastular (32 cell stage) - gastula
18 of 26
whats a malignant tumor?
its a tumor that invades surrounding tissues and metastasises
19 of 26
the differences between starch and cellulose
in starch the monomer units are alpha-glucose and in cellulose they are beta-glucose and alpha-glucose. In cellulose the bonds are held together by 1,4-glycosidic bond while in starch 1,4-glycosidic bond and 1,6-glycosidic bond
20 of 26
3 ways in which plants uptake water
symplast, apoplast and vacuolar pathway
21 of 26
what are the symptoms of mineral deficiency in plants
nitrogen (older leaves turn yellow and die, growth is stunted) calcium (growing points die and younger leaves turn yellow and crinky) magnesium (yellow areas develop on the older leaves and growth slows down) phosphate (very dark green leaves)
22 of 26
how is paper made?
wood is soaked in costic soda to produce a pulp consisting of cellulose and lignified cellulose fibres in water. Thin layers of pulp are then pressed onto frames and dried to form paper.
23 of 26
types of bio plastic
1.cellulose based plastic 2.thermoplastic starch 3.polylactic acid (PLA) 4.poly-3-hydroxybutyrate (PHB)
24 of 26
3 types of selections
1.directional selection 2.diversifying selection 3.balancing selection
25 of 26
types of isolation
geographical, ecological, seasonal, behavioural, machanical isolation
26 of 26

Other cards in this set

Card 2

Front

what are the two types of polypeptide chains in a haemoglobin

Back

alpha chains and beta chains

Card 3

Front

properties of water

Back

Preview of the front of card 3

Card 4

Front

what are the main functions of the blood?

Back

Preview of the front of card 4

Card 5

Front

whats the steps of blood clotting mechanism?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all TILL TOPIC 3.4 resources »