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diamong [38]
3 years ago
12

Which of the following does not pertain to helminths? A. Often alternate hosts in complex life cycles In kingdom B. Protista Egg

s and sperm used for reproduction C. Have various organ systems D. Parasitic worms
Biology
2 answers:
Vikentia [17]3 years ago
6 0

Answer:B. Protista eggs and sperm

Explanation: helminths are parasitic worms that inhabits the intestinal tract of humans; they live within the host and have attachment organs which enable them to reside within their host; examples include: roundworms (Nematodes), tapeworms ( Cestodes) and flukes( Trematodes)

Katen [24]3 years ago
4 0

Answer: B. Protista Eggs and sperm used for reproduction.

Explanation: All helminths have eggs (ova) for reproduction. They can be either hermaphroditic (possess both sex organs), example tapeworms or have their sex organs differentiated, like the roundworms.

Helminths are parasitic worms, they infest their host tissues. They mostly alternate host in different stages/phases of life.

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astra-53 [7]

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2) CAG - TTC - ACG mutates to CAG - TTC - ACC - ACG

Explanation:

Insertions are mutations in which extra base pairs are inserted into a new place in the DNA. The number of base pairs inserted can range from one to thousands!

In option no. 1: We see that there is not addition of a single or more than one base, but the new base sequence is different from the original sequence at three places i.e: TTA - CAC - G

In option no. 2: The insertion of three bases ACC has been made exactly after TTC, the whole sequence and arrangement of bases remain same except this insertion.


In option no. 3: The first base of the sequence T is replaced with A, and all other sequence is same. This type of mutation is called substitution in which one base is replaced by other.


In option no. 4: The last base of the sequence C is deleted, and is not present in new sequence. This type of mutation is called deletion in which a base is removed from the sequence.


Conclusion: Therefore, the best option is 2, in which whole codon is inserted in the DNA base sequence.



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3 years ago
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