Practice Questions

TLS Online TPP Program

#Question id: 4605

Over long periods of 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?

#Zoology

Natural selection cannot account for losses, but accounts only for new structures and functions.
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 lose these structures.

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TLS Online TPP Program

#Question id: 37876

#Plant Biotechnology

Which type of open culture is ideal for studying the effect of an individual nutrient on cell growth and metabolism?

TLS Online TPP Program

#Question id: 37877

#Plant Biotechnology

In a turbidostat, fresh medium is added:

TLS Online TPP Program

#Question id: 37878

#Plant Biotechnology

Assertion (A): In a closed continuous culture system, the total cell biomass continues to increase over time.

Reason (R): In this system, cells are separated from the removed spent medium and recycled back into the culture vessel

Choose the correct option from the following:

TLS Online TPP Program

#Question id: 37879

#Plant Biotechnology

Assertion (A): Open continuous cultures are capable of maintaining cells in a steady state of submaximal growth indefinitely.

Reason (R): In open continuous cultures, only the spent medium is removed while the cells are retained within the bioreactor.

Choose the correct option from the following:

TLS Online TPP Program

#Question id: 37880

#Plant Biotechnology

Assertion (A): To maintain a steady state in an open continuous culture, the volume of fresh medium added must be equal to the volume of culture removed.

Reason (R): Without balancing the input and output volumes, the culture volume would change, disrupting the steady state and nutrient availability.

Choose the correct option from the following:

TLS Online TPP Program

#Question id: 37881

#Plant Biotechnology

Assertion (A): Continuous culture systems are strictly classified as closed systems where no material leaves the vessel.

Reason (R): Continuous cultures require the regular replacement of a portion of the spent medium with fresh medium.

Choose the correct option from the following: