A pollen tube together with its contents of male gametes constitutes the ____.
A. male reproductive organ
B. endosperm mother cell
C. mature male sporophyte
D. immature male gametophyte
E. mature male gametophyte
Answer: E
You might also like to view...
To maintain adequate nutrition, animals require dietary access to certain amino acids. An amino acid that is not "essential" would be best described as one that _____
A) can be made by the animal's body from other substances B) is not used by the animal in biosynthesis C) must be ingested in the diet D) is not readily absorbed by the gastrointestinal tract E) is not found in many proteins
Many gastropods have external shells composed of:
a. two valves. b. eight overlapping valves. c. a series of internal chambers. d. one valve. e. chitin.
A defining characteristic of eukaryotic organisms is that they
A. use the leucine zipper primarily for the production of the amino acid tryptophan. B. carry out protein synthesis only in the presence of the cAMP molecule. C. have only operons to assist in gene expression. D. have their transcription occurring in the nucleus and translation in the cytoplasm. E. have their transcription occurring in the cytoplasm and translation in the nucleus.
What are the structures that increase the surface area of the small intestine
What will be an ideal response?