Answer:
In prokaryotes (organisms without a nuclear membrane), DNA undergoes replication and transcription and RNA undergoes translation in an undivided compartment. All three processes can occur simultaneously.
In eukaryotes (organisms with a nuclear membrane), DNA undergoes replication and transcription in the nucleus, and proteins are made in the cytoplasm. RNA must therefore travel across the nuclear membrane before it undergoes translation. This means that transcription and translation are physically separated. The primary transcript, heterogeneous nuclear RNA (hnRNA), undergoes extensive post-transcriptional processing to make a messenger RNA (mRNA)molecule that can pass through the nuclear membrane.
Explanation:
Answer:
Adaption is a gradual process of change or modifications of animal body either physically, structurally or behavioral changes in order to thrive and adjust better in the changing environment for survival.
Explanation:
Adaptation could takes by exhibiting a sort of mimicry to the habitat in which the animal thrive. Also it could takes place by the process of structural changes that blends them well with the environment. Classical Example is the adaptation by Polar bear. In the coolest arctic region, polar bear possesses long white furs with big sized paws and long hair. This help them to blend with white snowy color of environment and the big sized paws prevents them from slipping in ice and also could dig in the ice to take shelter is hostile weather like snowstorm. They have thick layers of fat beneath the skin that keeps them warm. Also they are capable of swimming , in spite of a big body to facilitate their feeding on fishes on arctic sea.
Diploid sporophytic generation alternating with haploid gametophytic generation <span>phrases characterizes alternation of generation in algae.</span>
Answer: The body discovered is Planet
Explanation:
A planet is an astronomical body orbiting a star (sun) usually rocky like in nature that is massive enough to be rounded by its own gravity.
<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
