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TLS Online TPP Program

#Question id: 3979

“Housekeeping genes” in bacteria are commonly expressed constitutively, but not all of these genes are expressed at the same level (the same number of molecules per cell). The primary mechanism responsible for variations in the level of constitutive enzymes from different genes is that:

#Unit 3. Fundamental Processes

all constitutive enzymes are synthesized at the same rate, but are not degraded equally.
their promoters have different affinities for RNA polymerase holoenzyme.
some constitutively expressed genes are more inducible than others.
some constitutively expressed genes are more repressible than others.

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TLS Online TPP Program

#Question id: 3489

#Unit 9. Evolution & Diversity of Life Forms

In a bird species A, the male alone builds the nest, incubates the eggs and feeds the nestling. In bird species B, it is the female that does all that. In bird species C, both sexes contribute equally to the above activities. In species A and B, the uninvolved partner may fly away and mate again. Which sex among A, B and C is most likely to develop colorful plumage during breeding season?

TLS Online TPP Program

#Question id: 3490

#Unit 9. Evolution & Diversity of Life Forms

Given below are some behaviors strategies.

A) Fixed action pattern, complex sequence of behavior, Once released and continuous to completion, even when there is change in surrounding environment

B) natural selection select that territorial behavior that is benefit is greater than cost

C) Imprinting, a form of learning in which a very young animal fixes its attention on the first object with which it has visual, auditory, or tactile experience

D) Donor benefits at a cost to the recipient, the behavior is altruistic; when the recipient benefits at a cost to the donor, the behavior is selfish.

Which one of the following correct combination of true and false?

TLS Online TPP Program

#Question id: 3491

#Unit 9. Evolution & Diversity of Life Forms

Some dogs love attention, and learns that if he barks, he gets attention. Which of the following might you use to describe this behavior?

A) The dog is displaying an instinctive fixed action pattern.

B) The dog is trying to protect its territory.

C) The dog has been classically conditioned.

D) The dog's behavior is a result of operant conditioning

E) The dog is displaying controlled by external stimuli

TLS Online TPP Program

#Question id: 3492