Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 54255
TLS Online TPP Program

#Question id: 29484

Physiological action of Cytokinins is given
a. Induce cell division in callus cells in the presence of an auxin 
b. Promote bud or root formation from callus cultures 
c. Delay senescence of leaves
d. Promote expansion of dicot cotyledons

Which of the following is correct

#Unit 6. System Physiology – Plant
  1. b only 
  2. a, & b only
  3. c, & d only
  4. a, b, c, & d
More Questions
TLS Online TPP Program

#Question id: 12420

#Unit 10. Ecological Principles

Given the following information, determine whether the number of females in the population is increasing, decreasing, or remaining the same. Of 1000 individuals in age group 0–1 none reproduce and 500 survive to age group 1–2. One-half of those in age group 1–2 survive to age group 2–3. 125 individuals survive to age group 3–4. In age group 3–4 there is an average of 1 female birth per female. In each age group, with the exception of the 0–1 age group, there is an average of 1 female birth per female.
TLS Online TPP Program

#Question id: 1619

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements is TRUE of interferons?
TLS Online TPP Program

#Question id: 2906

#Unit 2. Cellular Organization

A closer look at the interactions between the histones and the nucleosomal DNA reveals the structural basis for the binding and bending of the DNA within the nucleosome. Fourteen distinct sites of contact are observed, one for each time the minor groove of the DNA faces the histone octamer. State whether the following set of statements is true/false regarding this association?

I. The majority of these associations are between the proteins and the oxygen atoms in the phosphodiester backbone near the minor groove of the DNA.

II. The association of DNA with the nucleosome is mediated by a large number (about 40) of hydrogen bonds between the histones and the DNA.

III. Maximum numbers of hydrogen bonds are made between the protein side chains and the bases, and all of these are made in the minor groove of the DNA.

IV. The highly basic nature of the histones further facilitates DNA bending by masking the negative charge of the phosphates that ordinarily resists DNA bending.

V. The positively charged nature of the histones facilitates the close juxtaposition of the two adjacent DNA helices necessary to wrap the DNA more than once around the histone octamer.
TLS Online TPP Program

#Question id: 5159

#General Aptitude

the last digit of the number 3^2016 is
TLS Online TPP Program

#Question id: 19113

#Unit 8. Inheritance Biology

P, Q, and R are three different inbred, true-breeding strains of mice. A hybrid between P and Q is mated to R, and a hybrid between Q and R is mated to P. A male from the first mating is mated to a female from the second mating. What is the inbreeding coefficient of their progeny?