In the life cycle of an angiosperm, which of the following stages is diploid?
A) megaspore
B) generative nucleus of a pollen grain
C) polar nuclei of the embryo sac
D) microsporocyte
E) both megaspore and polar nuclei
Answer: D
You might also like to view...
The semiconservative model of replication means that each strand will consist of some newly synthesized DNA and some parental DNA
A. true B. false
The peptides presented by MHC class II peptide molecules are
A. from plasma cells. B. exogenous antigens. C. endogenous antigens. D. from T helper cells.
What process or enzyme was used for Step 1 in the accompanying figure?
a. PCR
b. a bacteriophage
c. a reverse transcriptase
d. a DNA ligase
e. a restriction enzyme
Which of the following organisms causes Yaws?
A. Treponema pallidum endemicum B. Treponema pallidum pallidum C. Treponema pallidum carateum D. Treponema pallidum pertenue