Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 9040
TLS Online TPP Program

#Question id: 12258

The acoustical receptors are destroyed on a population of larvae and rates of wasp predation are measured on the "deaf” larvae and  on  a  population  of  normal  larvae.  Based on the  curve  in  the  figure  and  on  the  concept  that animals possess sensory mechanisms that enhance survival, one could correctly predict which of the following?

#Unit 10. Ecological Principles
  1. Predation intensity on  normal  and  "deaf"  larvae  would  not  differ  because  wasps  hunt  visually  and  both larval populations would be equally visible.
  2. Predation intensity would be greater on "deaf" larvae because the wasps could approach more closely before being detected and there would be less time for escape.
  3. Predation intensity would be greater on the normal larvae because they are attracted to the wasp buzz.
  4. Predation intensity on normal and on “deaf"  larvae  would  not  differ  because the  larvae  are  too  slow  to escape the approaching wasp.
More Questions
TLS Online TPP Program

#Question id: 5146

#Unit 5. Developmental Biology

Choose the correct match.

Process                                                 Definition                                                                                                                                                                                                                
a. Epithelial-mesenchymal transitioni. The phenomenon, whereby cells intercalate to narrow the tissue and at the same time lengthen it.
b. De-adhesionii. The process in which cells that had formerly been part of an epithelium lose their attachments and become individual, migrating cells.
c. Permissive interactioniii. The cadherins that couple epithelial cells together are degraded, thereby allowing the cells to become free from their neighbors.
d. convergent extensioniv. The responding tissue has already been specified and needs only an environment that allows the expression of these traits.
TLS Online TPP Program

#Question id: 5147

#Unit 5. Developmental Biology

What is the dissimilarity amongst "fate" and "specification"?
TLS Online TPP Program

#Question id: 5236

#Unit 5. Developmental Biology

Following statements regarding to signaling pathways that control the properties of germline stem cells in drosophila.

A. The signaling molecules—the TGF-β-family proteins Dpp and Gbb as well as Hedgehog (Hh)—are maintain the self -renewal property of germline stem cells by the repression of differentiation factor.

B. Both E-cadherin and Arm are important in maintaining the germline stem-cell niche and regulate the proliferation of stem cells.

C. The signaling molecules—the TGF-β-family proteins Dpp and Gbb as well as Hedgehog (Hh)—are maintain germline stem cell
niche as well as self-renewal property.

D. Both E-cadherin and Arm are important in maintaining the self -renewal property of germline stem cells by the repression of differentiation factor.

Which of the following is correct?
TLS Online TPP Program

#Question id: 5237

#Unit 5. Developmental Biology

Match the following stem cell type (Column I) with their niche location (Column II).

     Column I

Column II

A. Intestine

i. Bone marrow

B. Hematopoietic stem cells

ii. Bulge

C. Hair follicle

iii. Testes

D. Sperm

iv. Base of small intestinal crypts

Which of the following is correct?
TLS Online TPP Program

#Question id: 5238

#Unit 5. Developmental Biology

all tissue types possess a unique stem cell niche, and despite many differences among the niche architecture of different tissues, several common principles of stem cell regulation can be applied to all environments. These principles involve extracellular mechanisms leading to intracellular changes that regulate stem cell behavior.

Column A

Column B

I. Extracellular regulatory mechanisms

i. Regulation by endocrine, paracrine, or juxtacrine mechanisms

II. Intracellular regulatory mechanisms

ii. Regulation by a network of transcription factors

iii. Epigenetic regulation

iv. Regulation by cell-to-cell and cell-to-matrix adhesions

v. Regulation by cytoplasmic determinants

Match the following regulatory mechanism (column A) with the factors that regulate stem cell behavior (column B).
TLS Online TPP Program

#Question id: 5254

#Unit 5. Developmental Biology

Following signal transduction pathways can be grouped into several basic types, based on the sequence of intracellular events.

According to above figure, which of the following correctly represents the basic concepts of all signalling pathway?