Answer:
All life on Earth consists of either eukaryotic cells or prokaryotic cells. Prokaryotes were the first form of life. Scientists believe that eukaryotes evolved from prokaryotes around 2.7 billion years ago.
The primary distinction between these two types of organisms is that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not. The nucleus is where eukaryotes store their genetic information. In prokaryotes, DNA is bundled together in the nucleoid region, but it is not stored within a membrane-bound nucleus.
The nucleus is only one of many membrane-bound organelles in eukaryotes. Prokaryotes, on the other hand, have no membrane-bound organelles. Another important difference is the DNA structure. Eukaryote DNA consists of multiple molecules of double-stranded linear DNA, while that of prokaryotes is double-stranded and circular.
Explanation:
Answer:
naked seed, Conifers, pollen grains (male gametophyte)
Explanation:
Gymnosperms are known as seed producing plants. the term gymnosperm means is naked seed that means that the seed in gymnosperm plants are non-encased while in angiosperms seed are covered within an ovary.
Conifers is an example of gymnosperms plants. Other example of gymnosperms are cycads, gnetophytes and ginkgoes.
Gymnosperms are fertilised when pollen grains (male gametophyte) are carried by the wind to the open end of an ovule, which contains the eggs, or female gametophyte. The ovule formed is converted into naked seed.
Hene, the correct answer for blanks are naked seed, Conifers, pollen grains (male gametophyte).
Answer:
A) Bacteria cannot carry out RNA splicing to remove introns and so produced a much larger protein.
Explanation:
Human is a eukaryote and has both introns and exons in its genes. Transcription of human genes forms a primary transcript that undergoes post-transcriptional modification.
One of the important even during the post-transcriptional modification is the removal of introns and joining the exons together to make a mature mRNA which in turn serves as the template for protein synthesis.
<em>E. coli</em> is a prokaryote and does not have the enzymatic machinery required for the splicing of introns.
Cloning of a complete human gene into the <em>E. coli</em> cells would not form the respective human protein since the bacterial cells would not be able to splice the introns from the primary transcript.