Ans.
Steroids are defined as active organic bio-molecules, having four rings with a specific molecular configuration. Steroids play role in two major functions: as hormones or signaling molecules and as structural components of plasma membrane.
Examples of steroid hormones are estrogen, progesterone, and cortisol. Thus, the correct answer is 'option b). they serve as chemical messengers.'
Answer:
agcttgagt
Explanation:
DNA is a double helix molecule composed of two complementary DNA strands which are in turn composed of four different nucleotide bases: Adenine (A), Guanine (G), Cytosine (C) and Thymine (T). In the DNA molecule, G and C are bound together as a base pair, while A and T are bound together as another base pair. This complementary base pairing structure means that both DNA strands are complementary to each other. In this case, since the sequence of one strand is "TCGAACTCA", the complementary DNA strand would have the sequence "AGCTTGAGT".
Answer:
Cis-acting sequence in bacteria that control transcription.
Explanation:
The proteins binds to Cis-acting sequences in transcription process of bacteria. This binding control the expression of one or more genes. These similar sequences are also found in eukaryotes.
The gene transfer assay helps in identifying these sequences in eukaryotes. Thus, Cis-acting sequence Controls the expression of one or more genes by serving as the binding site for regulatory proteins.
