Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 8729
TLS Online TPP Program

#Question id: 11947

Why is milk produced only after delivery, not before?

#Unit 7. System Physiology – Animal
  1. Levels of luteinizing hormone and follicle-stimulating hormone are too low during pregnancy to support milk production
  2. High levels of progesterone and estrogen during pregnancy suppress milk production
  3. The alveolar cells of the breast do not reach maturity until after delivery
  4. High levels of oxytocin are required for milk production to begin, and oxytocin is not secreted until the baby stimulates the nipple
More Questions
TLS Online TPP Program

#Question id: 4739

#Unit 8. Inheritance Biology

Inheritance of leaf variegation in the four-o’clock plant, Mirabilis jalapa. the leaves and shoots of one variety of four-o’clock were variegated, displaying a mixture of green and white splotches. If  Flowers on the variegated branches gave rise to
TLS Online TPP Program

#Question id: 23678

#Unit 13. Methods in Biology

Which component is not necessary for a PCR experiment?
TLS Online TPP Program

#Question id: 32408

#Unit 1. Molecules and their Interaction Relevant to Biology

What would result if 14CO2 were incorporated into the TCA cycle via the pyruvate carboxylase reaction.
TLS Online TPP Program

#Question id: 14900

#Unit 6. System Physiology – Plant

polymer-trapping model explains symplastic loading in plants, This model states that the sucrose diffussion takes place through cell to cell via plasmodesmata; which of the following prediction about the diffusion mechanism is INCORRECT?    
TLS Online TPP Program

#Question id: 15412

#Unit 8. Inheritance Biology

For a trait known to be caused by a mitochondrial gene variant, there may be an occasional female that can transmit different phenotypes to her progeny on an apparently random basis. What situation might you suspect?