An orange roughy fish eats squid and small fish. it also is eaten by predators like dolphins and sharks. where would the orange roughy most likely appear on a food web?

a. it is a primary producer because it provides food for the dolphins and sharks.
b. it is a tertiary consumer because most of the things it eats are secondary producers.
c. it is a secondary consumer because it eats two types of things.
d. it is a primary consumer because it has both predators and prey.

The correct answer would be B. It is a tertiary consumer because most of the things it eats are secondary producers.

In a food chain or web, the tertiary consumers are those which can consume primary as well as secondary consumers.  

They are either carnivores, that is, meat eater or omnivores, that is, those who consume both plants as well as animals.

Similarly, orange roughy fish consume organisms like squid which is itself a secondary or tertiary consumer in a food chain. It can also consume small fishes which are primary consumers in a food chain.

Thus, orange roughy fishes would be a tertiary consumer in a food web.

B. It is a tertiary consumer because most of the things it eats are secondary consumers.

Just took the quiz, 100% correct.

step 1: initiation

initiation is the beginning of transcription. it occurs 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.

step 2: elongation

elongation 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.

step 3: termination

termination 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.

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