Tim makes a volcano demonstration for a class. he crafts the volcano out of clay, and then pours vinegar into the baking soda that is inside the volcano. what would be the best way for tim to turn this demonstration into an experiment? a) he could pour the same amount of vinegar into several different volcanoes containing baking soda, repeating the demonstration. he would be answering the question “what happens when i pour vinegar into baking soda? ” b) he could time how long the volcano bubbles after he pours the vinegar into the baking soda. he would be answering the question “how long will my volcano bubble? ” c) he could measure how far the bubbles travel across the laboratory table after he pours the vinegar into the baking soda. he would be answering the question “how far will bubbles travel across a flat surface? ” d) he could add different amounts of vinegar to the same amount of baking soda and time how long it bubbles each time. he would be answering the question “how does increasing the amount of vinegar affect the amount of bubbles that form? ”

Option (D)

Explanation:

Baking soda contains bicarbonates and vinegar contains acetic acid. When acetic acid reacts with the bicarbonates it generates Carbon dioxide (CO₂) gas. Adding more quantity of vinegar into the same amount of baking soda will lead to the formation of bubbles for a longer period of time. So from this demonstration, Tim can perform an experiment where increasing the quantities of vinegar will lead to an increase in the number of bubbles and forming bubbles for a long time.

In nature, the volcanic eruptions take place because magma comes out to the surface forming lavas ejecting a significant amount of Carbon dioxide (CO₂) into the atmosphere. If the amount of intruding magma is high then it will lead to extensive volcanism thereby releasing a huge amount of carbon dioxide.

Thus, the correct answer is option (D).

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.

looks like the answer is     c     to me!