Left ventricle --> systemic circulation --> right atria --> right ventricle --> lungs --> left atria.
Yeast (Saccharomyces cerevisiae)
Fruit fly (Drosophila melanogaster)
Nematode worm (Caenorhabditis elegans)
Western clawed frog (Xenopus tropicalis)
The Option D is correct.
All nucleic acids are made up of the same building blocks (monomers). Chemists call the monomers "nucleotides."
The nucleic acids are the building blocks of living organisms.
Nucleic acid is a complex organic substance present in living cells, especially DNA or RNA, whose molecules consist of many nucleotides linked in a long chain.
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material found in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is found in the nucleus of eukaryotes and in the chloroplasts and mitochondria
.
Answer:
a. They are complex structures attached to the centromeres of chromosomes that bind to spindle microtubules.
d. They are enzymes that control progression through the cell cycle.
Explanation:
In the eukaryotes during cell division, the spindle apparatus gets attached to the chromatid in a structure called kinetochore. It is present in the centromere. It supervises, control and starts the striking movement of chromosome during division. For chromosome editing its protein helps in holding the sister chromatid. Every chromatid have there own kinetochore that faces in the opposite direction, and are also attached to the opposite pole of the mitotic spindle apparatus
.
