Answer: Amniocentesis
Explanation:
An amniocentesis is performed when a woman is between 14 and 16 weeks gestation. Women who choose to have this test are primarily those at increased risk for genetic and chromosomal problems, in part because the test is invasive and carries a small risk of miscarriage.
<span>The swirling spirals and animal interlace seen in the book of
kells originates in the Book of Matthew. It shows Christ's initials known as XPI,
in Greek, alongside the words "Christi autem generatio", which means
"now this is how the birth of Christ came about" was also shown. It
indicates the commencement of the Book of Matthew in which the confinement of
Jesus is renowned.</span>
Answer:
A.
Explanation:
Passive transport is defined as the movement of ion and other molecules through cell membrane without any energy input while active transport is the movement of ions and other molecular substances across cell membranes with an energy input which allows, molecules to move from a region of lower concentration to a region of higher concentration.
Uptake of iodide ions by thyroid cell is an active transport which is mediated by sodium/iodide symporter (NIS) protein, found in basolateral membrane of thyroid follicular cells. As the concentration of iodide ions is higher in thyroid cells, active transport make movement of iodide ions form extracellular fluid (lower concentration) to thyroids cells (higher concentration).
Hence, the correct option is A.
Gene expression begins with transcription and occurs in the <u>nucleus.</u> To create an <u>RNA molecule,</u> the DNA sequence of a gene must be copied. <u>RNA polymerases, </u>which join nucleotides to create an RNA strand, carry out transcription (using a DNA strand as a template).<u> Initiation, elongation, and termination</u> are the three phases of transcription.
- RNA polymerase is the enzyme responsible for constructing the messenger RNA transcript from the template DNA.
- The synthesis of mRNA always proceeds in a 5’ to 3’ direction. In eukaryotes, the nucleus is the site of mRNA synthesis, whereas, in prokaryotes, mRNA is formed in the cytoplasm. The process of transcription has three stages:
Initiation stage – RNA polymerase begins the synthesis by recognizing the gene present at the beginning of the template strand.
The polymerase binds to the specific sequence, which at present at the initial end of the template. These are called consensus sequences. Specific transcription factors facilitate the recognition and binding of the consensus sequence with RNA polymerase.
Elongation stage – the RNA polymerase copies the mRNA complementary to the coding strand. The process of elongation continues till the RNA polymerase reaches the terminal sequence. Certain factors facilitate the elongation process called extension factors.
Termination stage – RNA polymerase, upon reaching the termination sequence, stops the transcription. At this point, no more elongation is carried out. The nascent mRNA is released from the transcription bubble by either of the two processes:
- By formation of a hair loop structure that pulls the mRNA from the transcription complex or,
- A protein called Rho utilizes ATP to break the bonds and release the nascent mRNA.
learn more about transcription here: brainly.com/question/25703686
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Answer:
Cell wall and plastid
Explanation:
The most important difference between plant cell and animal cell is that plant cell contain cell wall for mechanical strength and plastid to carry out photosynthesis(chloroplast). and storage(leuko plast).
But in case of animal cell cyto skeleton is present in place of cell wall and plastid is absent because animals generally does not carry out photosynthesis.