The edges of each base pair are exposed in the major and minor grooves, creating a pattern of hydrogen-bond donors and acceptors and of hydrophobic groups (allowing for Vander Waals interactions) that identifies the base pair. The edge of an C : G base pair displays the following chemical groups in the following order in the major groove:

TLS Online TPP Program

#Question id: 24513

#Unit 10. Ecological Principles

during a life cycle of adult lancet fluke live in cows. They spread their eggs in cow manure, snails eat the eggs and the immature parasites hatch and infect their intestine. The snail coughs up these offspring in balls of slime and ants eat these slime balls loaded with flukes. The flukes migrate to the ant’s head and make them climb to the tops of grass blades where they are eaten by cows and the cycle starts over again

a. Only ant act as inntermediate host 

b. both snail and Ant act as intermediate host

c. cow act as definitive host due to sexual reproduction

d. only snail act as intermediate host due to asexual reproduction

TLS Online TPP Program

#Question id: 24514

#Unit 10. Ecological Principles

Dicrocoelium dendritium  are adult lancet flukes produces egg, which act as definitive host that is,

TLS Online TPP Program

#Question id: 24515

#Unit 10. Ecological Principles

which of the following a definitive host of parasite toxoplasma gondii, where  it complete their sexual reproduction?

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