Compare and contrast osmoregulation of freshwater fish vs. marine fish. What will be an ideal response?
Freshwater fishes live in a hypotonic environment; consequently, water continuously enters the body,
and salts diffuse out. To counteract these tendencies, the gills move some water out and actively
transport salts in. In addition, the kidneys excrete large amounts of dilute urine.
Marine fishes live in a hypertonic environment; consequently, they lose water via osmosis and gain
salt. To compensate, marine bony fishes drink sea water, their gills excrete salt, and their kidneys
excrete only a small amount of urine.
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The presence of cytoplasmic organelles is characteristic of
a. Archaea only. b. Bacteria only. c. both Archaea and Bacteria. d. neither Archaea nor Bacteria. e. Achaea, Bacteria and Eukarya.
A mutation results in an enzyme that is partially active compared to the wild-type allele. This type of "leaky" mutation is classified as __________
A) amorphic B) hypomorphic C) hypermorphic D) neomorphic E) dominant negative
What is the consequence of placing a proline side chain within an alpha helix?
A) Proline disrupts the structure of an alpha helix, causing it to kink. B) Proline stabilized the folded alpha helical structure, causing it to kink. C) Proline isomerizes to the trans form and the alpha helix is undisturbed
The human embryo becomes a fetus at the end of the second month of gestation.
Answer the following statement true (T) or false (F)