The cell walls of bacteria, fungi, and plant cells, and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following characteristics are common to all of these extracellular structures?

#Question id: 5231

#Unit 11. Evolution and Behavior

Although quite different in structure, plants and animals share some basic similarities in their development, such as

#Question id: 5232

#Unit 11. Evolution and Behavior

Using molecular clock, it was estimated that two species X and Y must have diverged from their common ancestor about 5 x 10^6 years ago. If the rate of divergence per base pair is estimated to be 0.06 per million years, what is the proportion of base pairs that differ between the two species now?

#Question id: 5233

#Unit 11. Evolution and Behavior

The most important feature that permits a gene to act as a molecular clock is ________.

#Question id: 5234

#Unit 11. Evolution and Behavior

Which of the following would, if it had acted upon a gene, prevent this gene from acting as a reliable molecular clock?

#Question id: 5235

#Unit 11. Evolution and Behavior

What is proteomics?

#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?