TLS Online TPP Program

#Question id: 3989


Which one of the following statements about the transcription attenuation mechanism is true?

#Unit 3. Fundamental Processes
  1.  In some operons (e.g., the his operon), attenuation may be the only regulatory mechanism.

  2. Sequences of the trp operon leader RNA resemble an operator.

  3. The leader peptide acts by a mechanism that is similar to that of a repressor protein.

  4. The leader peptide gene of the trp operon includes no Trp codons.

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TLS Online TPP Program

#Question id: 3506

#Unit 11. Evolution and Behavior

An altruist provides help worth 9 units of fitness to a recipient, at a personal cost of 2 unit of fitness. As per kin-selection theory, the minimum value of genetic relatedness between the actors and the recipients that is necessary to maintain altruism in the population is

TLS Online TPP Program

#Question id: 3507

#Unit 11. Evolution and Behavior

Rank the following from most general to most specific:

A. gametic isolation

B. reproductive isolating mechanism

C. pollen-stigma incompatibility

D. prezygotic isolating mechanism

TLS Online TPP Program

#Question id: 3508

#Unit 11. Evolution and Behavior

In these cases, females would indirect benefit by choosing the male that having which of following attribute 

a. can provide the best care

b. provide no care, but maintain territories

c. Large males, have probably been successful at living long, acquiring a lot of food and resisting parasites and disease

d. The long tail of the peacock

TLS Online TPP Program

#Question id: 3509

#Unit 8. Inheritance Biology

Principle of independent assortment apply for those gene that is

TLS Online TPP Program

#Question id: 3510

#Unit 8. Inheritance Biology

Assume that the trihybrid cross AA BB RR X aa bb rr is made in a plant species in. What proportion of F2 progeny would be expected to be homozygous for all three genes when independently assort?

TLS Online TPP Program

#Question id: 3511

#Unit 8. Inheritance Biology

What proportional of one round and two wrinkle seed if random selected 3 seed from various seed produced from monohybrid test cross?