In the phylogenetic trees, numbers represent species, and the same species are shown in both trees. Which two species are represented as sister species in Tree 2 but are not shown as sister species in Tree 1?

#Question id: 11551

#SCPH28 | Zoology

Polypeptides can have which of the following types of effects?

I) autocrine

II) paracrine

III) endocrine

#Question id: 11552

#SCPH28 | Zoology

Which of the following are properties of steroid hormones?

I) Steroid hormones are lipid soluble and easily cross the phospholipid bilayer.

II) Steroid hormones usually exert their effects on target cells through membrane receptor proteins.

III) Steroid hormones act on cells close to where they were produced.

IV) Steroid hormones regulate gene transcription by binding to intracellular receptor proteins.

#Question id: 11553

#SCPH28 | Zoology

Tadpoles must undergo a major metamorphosis to become frogs. This change includes reabsorption of the tail, growth of limbs, calcification of the skeleton, increase in rhodopsin in the eye, development of lungs, change in hemoglobin structure, and reformation of the gut from the long gut of an herbivore to the short gut of a carnivore. Amazingly, all of these changes are induced by thyroxine. What is the most likely explanation for such a wide array of effects of thyroxine?

#Question id: 11554

#SCPH28 | Zoology

What happens in a cell when adenylyl cyclase is activated?

#Question id: 11555

#SCPH28 | Zoology

Nitric oxide and epinephrine ________.

#Question id: 11556

#SCPH28 | Zoology

During mammalian labor and delivery, the contraction of uterine muscles is enhanced by oxytocin. This is an example of ________.