#Question id: 7760
#Unit 5. Developmental Biology
#Question id: 2437
#Unit 2. Cellular Organization
Membrane extension involves
a. bending actin filaments.
b. myosin II.
c. the Arp2/3 nucleation of new filaments.
d. actin depolymerization.
e. actin polymerization.
#Question id: 3825
#Unit 3. Fundamental Processes
Telomeres are the repetitive sequence of T's and G's that are present in the eukaryotes to protect the random cleavage from nucleases. These telomeres are synthesized by the enzyme telomerase. Which of the following are the properties of enzyme telomerase?
#Question id: 10920
#Unit 6. System Physiology – Plant
The pressure-flow model, first proposed by Ernst Münch, Phloem loading at the source and phloem unloading at the sink establish the pressure gradient.
a.) In source tissues, an accumulation of sugars in the sieve elements generates a lower or negative solute potential (ψs).
b.) source tissue, causes a steep drop in the water potential (ψ), due to water potential gradient, water enters the sieve elements and causes turgor pressure (ψp ) decrease.
c.) In sink tissues, phloem unloading leads to a lower sugar concentration in the sieve elements, generating a higher or less negative solute potential.
d.) As the water potential of the phloem rises above that of the xylem, water tends to leave the phloem in response to the water potential gradient, causing a decrease in turgor pressure in the sieve elements of the sink.
Which of the following statements of sink and source tissue is FALSE?
#Question id: 1314
#Unit 4. Cell Communication and Cell Signaling
In desmosomes, cadherins link to an adjacent cell via: