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TLS Online TPP Program

#Question id: 2990

Mitotic CDK complexes are maintained in an inactive state through inhibitory phosphorylation of the CDK subunit. Two highly conserved tyrosine and threonine residues in mammalian CDKs are subject to regulated phosphorylation.

Gene

  Mutant phenotypes

A. Wee1

i. the cell does not divide but continues to grow

B. CAK kinase

ii. mitotic cyclins are inactivated

C. cdc25 phosphatase

iii. premature entry into mitosis

The following table enlists genes and phenotypes observed on mutation of these genes but not correctly matched. Which one of the following combinations is correctly matched ?

#Unit 2. Cellular Organization

  1. A - ii, B - i, C - iii

  2. A - i, B - iii, C - ii

  3. A - iii, B - ii, C - i

  4.  A - iii, B - ii, C – ii

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TLS Online TPP Program

#Question id: 9259

#Unit 9. Diversity of Life Forms

The oceans affect the biosphere in all of the following ways except
TLS Online TPP Program

#Question id: 10696

#Unit 9. Diversity of Life Forms

In a new area two species A and B was discovered and taking energy from another species X and Y respectively. Following some is life history trait of species.

I- A species is often larger than X

II- Each A species taking energy from many X

III- One Y usually supports populations of B species

IV- Fatality of Y is Mild to severe

Which of the following is correct observation of above species?
TLS Online TPP Program

#Question id: 9260

#Unit 9. Diversity of Life Forms

Suppose that the number of bird species is determined mainly by the number of vertical strata found in the environment. If so, in which of the following biomes would you find the greatest number of bird species?
TLS Online TPP Program

#Question id: 9254

#Unit 9. Diversity of Life Forms

Organisms evolve over generations to become adapted to the environmental conditions to which they are exposed. The diversity of organisms that
occurs in any particular area thus may be largely determined by the abiotic factors limiting survivorship and reproduction of organisms in a region. Which of the following limit the range of Saguaro cactus in North America?

I) pollinators

II) sunlight

III) precipitation

IV) temperature
TLS Online TPP Program

#Question id: 9253

#Unit 9. Diversity of Life Forms

A certain species of pine tree survives only in scattered locations at elevations above 2,800 meters in the western United States. To understand why
this tree grows only in these specific places, an ecologist should ________.
TLS Online TPP Program

#Question id: 9182

#Unit 9. Diversity of Life Forms

Imagine that a deep temperate zone lake did not turn over during the spring and fall seasons. Based on the physical and biological properties of limnetic ecosystems, what would be the difference from normal seasonal turnover?