Hox genes are thought to play an important role in the development of different morphologies because see concept 25.5 (page 542) view available hint(s) hox genes are thought to play an important role in the development of different morphologies because see concept 25.5 (page 542) they affect the order of genes on certain chromosomes they affect the timing of development in the embryo they paved the way for the development of multicellular organisms they affect the timing of reproductive development in the organism they provide positional information in the embryo submit

The answer is; they provide positional information in the embryo

The hox genes are responsible for determining the head and tail ends of the embryo, and ensuring that the right embryo segments develop appropriately and with the right appendages. Without the hox genes, the embryo (and consequently the body) would become unplanned and abnormalities would occur such as having legs in the antennae section in drosophila sp.

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

transcription is a process in which information is rewritten. it is something our cells must do, in a more specialized and narrowly defined way. in biology, transcription is the process of copying out the dna sequence of a gene in the similar alphabet of rna. it needs to happen in the nucleus because that's where the dna is. dna is always inside the nucleus unless the cell is dividing.

transcription is the first step in gene expression, which involves copying a gene's dna sequence to make an rna molecule. transcription is performed by rna polymerases. it has three stages: initiation, elongation, and termination. rna molecules must be processed after transcription in eukaryotes.

explanation:

long version:

the protein synthesis consists two processes which are, transcription and translation. transcription takes place in the nucleus. it uses dna as a template to make an rna molecule. rna then leaves the nucleus and goes to a ribosome in the cytoplasm, where translation occurs. transcription is the first part of the central dogma of molecular biology: dna → rna. it is the transfer of genetic instructions in dna to messenger rna (mrna). during transcription, a strand of mrna is made that is complementary to a strand of dna.  

these three stages are:

  initiation: in which   is the beginning of transcription.occuring when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

    elongation: in which is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

    termination: in which is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.