#Question id: 5686
#XL - R Botany
Following statements are regarding to double fertilization in angiosperms.
A. One sperm cell fuses with the egg cell to produce the zygote that will develop into the new embryonic plant.
B. The second sperm cell fuses with the usually binucleate central cell, giving rise to the
endosperm, the tissue that nourishes the developing embryo. This second event is not “true” fertilization in the sense of male and female gametes undergoing fusion.
C. The second sperm cell fuses with the usually binucleate central cell, giving rise to the
endosperm, the tissue that nourishes the developing embryo. This second event is “true” fertilization in the sense of male and female gametes undergoing fusion.
D. During fertilization in angiosperm, when the sperm cells are released, the egg undergoes a flux of Ca2+. Then, chemicals released from the egg appear to make the sperm competent for cell fusion.
Which of the following statements are true?
#Question id: 3790
#XL - Q Biochemistry
Semiconservative replication of DNA means that:
#Question id: 3000
#XL - S Microbiology
Mycoplasmas are bacteria that lack cell walls. On the basis of this structural feature, whichstatement concerning mycoplasmas should be true?
#Question id: 10570
#XL - R Botany
The diffusion coefficient (Ds ) is a characteristic of the substance
a) diffusion in liquid is much faster than diffusion in air
b) larger molecules have smaller diffusion coefficients
c) diffusion in air is much faster than diffusion in a liquid
d) Larger molecules have larger diffusion coefficient
Which of the following combination is correct?
#Question id: 20058
#XL - P Chemistry