Which hormone might be able to counteract the leaf drop caused by leaking street lanterns observed by Dimitry Neljubov?
A. Ethylene.
B. Cytokinins.
C. Gibberellins.
D. Brassinosteroids.
D. Brassinosteroids.
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There is an island in the middle of a large river that houses a large population of ants. Damming of the river causes the island to flood and only the highest points of the island are now above water. The ants cannot swim, so are now in multiple isolated populations. Which of the following best describes this event?
A) This situation represents isolation by dispersal. B) This situation represents isolation by vicariance. C) This situation represents a form of sympatric speciation. D) Only a rare development of polyploidy could lead to speciation in this case. E) Speciation will not occur in this case because of gene flow.
Calcium ions used for muscle contraction are stored in which part of the muscle cell?
a. the nucleus b. the Golgi apparatus c. the sarcoplasmic reticulum d. the ribosomes e. the lysosomes
What happens if a G1 cell sustains genetic damage?
a) The p53 protein concentration rises very rapidly. b) All of the choices are correct. c) The p53 protein exhibits an increase in stability. d) There is no increased expression of the p53 gene.
An animal lives in an environment where there are few predators, but the population is very dense. They likely have a life-history that is
A. r-selected, meaning there is rapid exponential increase in population growth B. K-selected, meaning that the species will likely be well-adapted to crowded conditions C. r-selected, meaning that the ability of individuals to compete with others is favored D. K-selected, meaning high fecundity is favored