A major chemical that regulates the fluidity of animal cell membranes by stiffening the membrane at higher temperatures (extreme heat), and preventing the membrane from freezing at lower temperature (during hibernation, etc.);  it is both a lipid and a steroid. What is this molecule?

The F2 offspring of a classic Mendelian monohybrid testcross would produce these genotypes:

Which of these does NOT influence the classification of a particular biome?

A major chemical that regulates the fluidity of animal cell membranes by stiffening the membrane at higher temperatures (extreme heat), and preventing the membrane from freezing at lower temperature (during hibernation, etc.);  it is both a lipid and a steroid. What is this molecule?

The carbonic acid/bicarbonate ion  _____________  system is an example of a combination of substances that attempt to resist changes in pH in the human bloodstream. It is one of the mechanisms of homeostasis.

An example of an X-linked trait in humans is hemophilia.  The males inherit the defective allele from their ___________.

The carbonic acid/bicarbonate ion  _____________  system is an example of a combination of substances that attempt to resist changes in pH in the human bloodstream. It is one of the mechanisms of homeostasis.

Identify this molecule:

What type of tissue is shown in picture  ‘b.’  of the diagram?

What type of tissue is shown in picture  ‘b.’  of the diagram?