#Question id: 2244
#Unit 2. Cellular Organization
Arrange the statements below in the proper sequence of events that occur in an action potential:
I. The resting potential is re-established.
II. A stimulus depolarizes the membrane to threshold.
III. Na+ gates open and Na+ rushes into the cell.
IV. K+ gates open and K+ rushes out of the cell.
#Question id: 4574
#Unit 11. Evolution and Behavior
Ichthyosaurs were aquatic dinosaurs. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are
#Question id: 1223
#Unit 4. Cell Communication and Cell Signaling
The receptors for steroid hormones are located inside the cell instead of the membrane surface like most other signal receptors. How do steroids gain access to their receptors?
#Question id: 10797
#Unit 6. System Physiology – Plant
The colored pigments of plants are of two principal types: carotenoids and flavonoids. Given below some statements of about these pigments;
a) Anthocyanins
are colored flavonoids that attract animals
b) Flavonoids are phenolic compounds that include a
wide range of colored substances
c) Carotenoids are coloured terpenoid compounds that
also serve as accessory pigments in photosynthesis
d) most widespread group of pigmented carotenoids is
the anthocyanins, these are glycosides that have sugars. Without their sugars,
anthocyanins are known as anthocyanidins
Which of the following is incorrect statements of these pigments;
#Question id: 3814
#Unit 3. Fundamental Processes
The mechanism of DNA replication is studied in an E. coli replication fork.
Which is a property of RNA primers in an E. coli replication fork?