The answer is adenine.
The nitrogenous base pairings are always adenine with thymine and cytosine with guanine.
I remember this as
· the two round letters (C and G) pair together
· the two straight-edged letters (A and T) pair together
Hopefully that helps.
<h2>Mitotic Cell Cycle</h2>
Explanation:
a. Cytochalasin: an inhibitor of actin microfilament
- Cytokinesis is the process by which cytoplasm is divided into two cells hence generation of two daughter cells
- In animal cells the division of cytoplasm starts with the assembly of contractile ring
- Contractile band consists of actin and myosin and catalyze cleavage furrow formation
- Cytochalasin is a drug that blocks the polymerization of actin filament
- When cytochalasin is added dividing cell fails to undergo in cytokinesis due to defective assembly of contractile band
b. Colchicine: an inhibitor of microtubule formation
- Colchicine tightly binds with free tubulin dimer and prevents its polymerization
- In this case mitotic spindle apparatus do not assemble and cells unable to do partitioning of chromosomes into two groups
- Thus cell division is arrested
c. Aphidicolin: an inhibitor of DNA Polymerase activity
- Aphidicolin is used to induce cell cycle arrest via specific inhibition of DNA Polymerase α
- It blocks the cell cycle at early synthesis(S) phase
d. Emetine: an inhibitor of ribosome activity
- It blocks the protein synthesis in eukaryotic cells by binding to small subunit(40 S) of ribosomes
- It interferes with the synthesis and activities of DNA and RNA
Proteins
u have to know that proteins are synthesized from basic units called amino acids. (think small Lego blocks forming a huge structure)
the process is called condensation.
there are 20 essential amino acids which we require for our daily body use. these amino acids molecular makeup COULD consist of those elements which you mentioned in your question.
hydrogen, carbon, oxygen and nitrogen elements are ALWAYS present in all amino acids. certain types of amino acids consist of phosphorus or even sulfur elements.
Water
Soil
The sun
Atmospheric Gases
Temperature.
These are just a few of many, but all abiotic factors are not living. Hence A-Biotic
Biotic means living, so when you put the ''a'' prefix it means the opposite of living.
