Answer:
C. double helix
Explanation:
Watson and Crick discovered that DNA molecules are double-helical structures. According to them, each DNA molecule has two DNA strands that are wound around an imaginary axis to form a double helix. These two DNA strands are held together by complementary base pairing between their bases. They discovered that a purine base pairs with a pyrimidine base to maintain a constant distance between the two strands of a double helix.
Answer: A DNA template is used to create an mRNA strand.
Explanation: Transcription is the first step in the formation of a long chain of aminoacids, a protein. I toccurs when a product of a particular gene at specific time and place is needed. In that specific area, the DNA opens up and only one strand of DNA is copied. This single strand is called <u>Template</u>. The transcription process is carried out by the enzyme RNA polymerase: First, it recognizes a specific sequence on DNA called promoter. This is the indicator of the beginning of the gene. The two strand of DNA separates and RNA polymerase begins copying using a special type of sugar called ribonucleoside 5'-triphosphate. Each ribonucleotide is paired to its complementary: C (citosine) with G (Guanine), T (thymine) with A (adenosine) and A with U (uracil). This last base is the main difference between DNA and RNA. The process contniues until a sign of termination is detected, releasing the RNA, now called <u>RNA messenger</u>.
Answer:
Add some iodine to a beaker containing the sample. If starch is present, the colour of the solution will turn blue-black.
Explanation:
What connects the kidneys to the bladder is two ureters