When Lucifer yellow, a small dye, is injected into a neuron of the retina, neighboring neurons become rapidly labeled. If the retina is incubated in dopamine prior to Lucifer yellow injection, only the injected neuron becomes labeled. These findings suggest which of the following?

I. Neurons of the retina communicate via gap junctions.

II. Dopamine is transferred between cells via gap junctions.

III. Dopamine decreases the permeability of gap junctions.

TLS Online TPP Program

#Question id: 24516

#Unit 10. Ecological Principles

which of the following parasitism is a form of feeding where one animal takes food that another has caught?

TLS Online TPP Program

#Question id: 24517

#Unit 10. Ecological Principles

A specific kind of parasitism proposes that  in which cuckoos or cowbirds repeatedly check their host’s nests and destroy all eggs if their owner is not present. If the parasite egg has been removed, they destroy the host’s nest and kill or injure the nestlings, this is an example of;

TLS Online TPP Program

#Question id: 24518

#Unit 10. Ecological Principles

Some nonnative parasites are introduced deliberately for the biological control of pests, which of the following are necessary attributes of a good agent of biological control?

a. low rate of increase relative to the host’s

b. Good dispersal ability

c. High searching capacity for hosts

d. Minimal time lag effects

e. Maximal time lag effect

f. General adaptability to the environment

TLS Online TPP Program

#Question id: 24519

#Unit 9. Evolution & Diversity of Life Forms

Natural selection idea is developed  independently by

TLS Online TPP Program

#Question id: 24520

#Unit 9. Evolution & Diversity of Life Forms

which of the following characteristics that are involved to enhances the survival and reproduction of organisms that bear it ?

TLS Online TPP Program

#Question id: 24521

#Unit 9. Evolution & Diversity of Life Forms

Adaptation is involved in

a. aestivation

b. Genetic drift

c. Origin of new species

d. Coevolution