Which of the following supports the idea that eukaryotic cells were formed by the joining of different kinds of prokaryotic cells?
A. Plants have cell walls.
B. Mitochondria carry on photosynthesis.
C. Chloroplasts contain DNA.
D. Animal cells have mitochondria.
C. Chloroplasts contain DNA.
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Which of the following statements about double fertilization in angiosperms is correct?
A) One pollen grain combines with the egg to form the zygote, and one pollen grain combines with the polar nuclei to form endosperm. Two sperm combine with a polar nucleus to form endosperm. B) Two pollen grains combine with two ovules to form the zygote and endosperm. C) One sperm combines with the polar nuclei to form the zygote, and one sperm combines with the egg to form endosperm. D) One sperm combines with the egg to form the zygote, and one sperm combines with the polar nuclei to form endosperm.
Prior to the divergence of animals, an ancestor is proposed to have developed the key shared trait of all animals, the
A. body form of multicellularity. B. presence of a mouth by which to consume nutrition materials. C. ganglia or brain cells to control all motion. D. embryonic development of the mouth first, from embryonic cells. E. body form of having true tissues.
The synthesis of an RNA molecule from a DNA
template strand is a. replication. b. translation. c. transcription. d. DNA synthesis. e. metabolism.
Eukaryotic cells most likely arose from
What will be an ideal response?