Practice Questions

TLS Online TPP Program

#Question id: 1104

Which of the following statements is true of signal molecules?

#Unit 4. Cell Communication and Cell Signaling

When signal molecules first bind to receptor tyrosine kinases, the receptors phosphorylate a number of nearby molecules.
In response to some G protein-mediated signals, a special type of lipid molecule associated with the plasma membrane is cleaved to form IP3 and calcium.
In most cases, signal molecules interact with the cell at the plasma membrane, enter the cell, and eventually enter the nucleus.
Protein kinase A activation is one possible result of signal molecules binding to G protein coupled receptors.

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TLS Online TPP Program

#Question id: 12589

#Unit 10. Ecological Principles

Which of these ecosystems has the highest net primary productivity per square meter?

TLS Online TPP Program

#Question id: 8708

#Unit 9. Diversity of Life Forms

Concerning growth in genome size over evolutionary time, which of these is least associated with the others?

TLS Online TPP Program

#Question id: 23365

#General Aptitude

The function of mass communication of supplying information regarding the processes, issues, events and societal developments is known as:

TLS Online TPP Program

#Question id: 3276

#Unit 11. Evolution and Behavior

Which of these conditions are always true of populations evolving due to natural selection?

Condition 1: The population must vary in traits that are heritable.

Condition 2: Some heritable traits must increase reproductive success.

Condition 3: Individuals pass on most traits that they acquire during their lifetime.

TLS Online TPP Program

#Question id: 594

#Unit 1. Molecules and their Interaction Relevant to Biology

The catalytic proficiency of an enzyme is the ________.