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: 11745

#Unit 6. System Physiology – Plant

sieve cells of the sieve elements of phloem conduct sugars throughout the plant. The following statements given about characteistics of Sieve cells of sieve elements in seed plants;

a.)  There is no P-protein in gymnosperms

b.) Angiosperm contains sieve plate pores are open channels

c.) Pores in sieve areas appear blocked with membranes in gymnosperms

d.) Companion cells are sources of ATP and perhaps other compounds

Which of the following combination is correct?

#Question id: 12032

#Unit 7. System Physiology – Animal

#Question id: 3421

#Unit 11. Evolution and Behavior

Following figure show fitness variation the presence of natural selection and frequency of genotype before natural selection. What will be effect on the frequency of phenotype? (Y axis- Frequency of genotype, X axis – phenotype)

#Question id: 5245

#Unit 8. Inheritance Biology

Which method of gene transfer involves direct contact between the bacteria?

#Question id: 23232

#Unit 2. Cellular Organization