There are almost 500 naturally occurring variants of hemoglobin. most are the result of a single amino acid substitution in a globin polypeptide chain. some variants produce clinical illness, though not all variants have deleterious effects. identify the variant or variants that can be described by each of the three statements by placing the letter corresponding to the statement next to the variant. statement b may describe more than one variant, and a variant may be described by more than one statement. at least one variant will not match any description. a. the hb variant least likely to cause pathological symptoms. b. the variants most likely to show pi values different from that of hba on an isoelectric focusing gel. c. the variant most likely to show a decrease in bpg binding and an increase in overall affinity for oxygen.

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my teacher would say no s

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.