Practice Questions

TLS Online TPP Program

#Question id: 4655

Over evolutionary time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?

#Unit 11. Evolution and Behavior

Natural selection cannot account for losses, only for innovations.
Natural selection accounts for these losses by the principle of use and disuse.
Under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefits.
The ancestors of these organisms experienced harmful mutations that forced them to find new habitats that these species had not previously used.

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TLS Online TPP Program

#Question id: 26451

#Unit 3. Fundamental Processes

Which of the following characteristics of sigma affect non specific binding of the core

TLS Online TPP Program

#Question id: 3026

#Unit 2. Cellular Organization

Not present in all bacteria, this structure enables those that possess it to germinate after exposure to harsh conditions, such as boiling:

TLS Online TPP Program

#Question id: 11114

#Unit 7. System Physiology – Animal

The amount of air exchanged during normal quiet breathing is about:

TLS Online TPP Program

#Question id: 22971

#Unit 7. System Physiology – Animal

PTH actions on the kidney:

a. Stimulates phosphate reabsorption

b. Stimulates Ca2+ reabsorption

c. Inhibits phosphate reabsorption

d. Inhibits Ca2+ reabsorption

TLS Online TPP Program

#Question id: 7762

#Unit 5. Developmental Biology

Correlation between life span and the ability of fibroblasts to repair DNA in various mammalian species, Repair capacity is represented in autoradiography by the number of grains from radioactive thymidine per cell nucleus. According to graph, which factor exist on x-axis ? Note that the y-axis (life span) is logarithmic.