Four of the five choices listed below are prokaryotic
structures. Select the exception.
a. ribosomes
b. cell wall
c. pili
d. endomembrane system
e. nucleoid
Answer: d
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Which structures are part of the same primary germ layer?
A) skin, tooth dentin, tonsils B) muscle, kidneys, dermis of skin C) bones, blood, thyroid gland D) uterus, bladder, pituitary gland
What is the difference between sister chromatids before and after anaphase II?
a. Before anaphase II, the sister chromatids are separate; after anaphase II, the sister chromatids join and form a chromosome. b. Before anaphase II, the sister chromatids form a single chromosome; after anaphase II, each sister chromatid is an individual chromosome. c. Before anaphase II, each sister chromatid is an individual chromosome; after anaphase II, the sister chromatids form a single chromosome. d. Before anaphase II, the sister chromatids form a single chromosome; after anaphase II, the sister chromatids become homologous chromosomes. e. There is no difference; they are still together as a single chromosome.
You discover a new species of plant in a tropical rain forest. You observe that it has flagellated sperm and the sporophyte emerges from the gametophyte; however, seeds and xylem tissue is lacking. This plant is probably a(n)
A) gymnosperm. B) fern. C) bryophyte. D) alga. E) angiosperm.
Sperm production is called ____.
A. parthenogenesis B. spermatocytosis C. oocytosis D. oogenesis E. spermatogenesis