There are at least three different types of companion cells in the minor veins of mature, exporting leaves. Which of the following statements about these companion cells is CORRECT?

 a.) transfer cells are transport sugars enter the apoplast during the movement of sugars from mesophyll cells to sieve elements. Transfer cells transport sugars from the apoplast to the symplast of the sieve elements and companion cells in the source.

 b.) the numerous mitochondria in companion cells may supply energy as ATP to the sieve elements

 c.) Ordinary companion cells can function in either symplastic or apoplastic short-distance transport in source leaves, depending in part on plasmodesmatal frequencies

 d.) Intermediary cells, by contrast, function in symplastic transport of sugars from mesophyll cells to sieve elements

#Question id: 3305

#Section 3: Genetics, Cellular and Molecular Biology

Co-evolution is related to

#Question id: 3306

#Section 3: Genetics, Cellular and Molecular Biology

Death feigning behaviour (i.e., pretending to be dead when attacked) is found in snakes and millipedes. This similarity in behaviour between snakes and millipedes is an example of

#Question id: 3307

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following conditions is not necessarily be fulfilled to trigger natural selection

#Question id: 3308

#Section 3: Genetics, Cellular and Molecular Biology

Consider a single locus with 3 alleles which are at Hardy- Weinberg equilibrium. If the frequency of all homozygous genotypes is 0.54, what is the frequency of allele in population?

#Question id: 3309

#Section 3: Genetics, Cellular and Molecular Biology

In a given population, 128 out of every 400 people has a carrier for recessive allele b that caused cancer in homozygous condition,  Assuming the population is in Hardy- Weinberg equilibrium, which of the following is the expected frequency of allele B and b in population respectively?

#Question id: 3310

#Section 3: Genetics, Cellular and Molecular Biology

In Prey population of genotype A1A1(100), A1A2( 200) and A2A2( 100) present in island, when predator introduced this area results ¼ of A1A1 and ½ of A1A2 killed over time however, no genotype A2A2 kill. What will be frequency of A1 allele in the population?