An example of a haploid cell is a
A. All of the answer choices are correct.
B. skin cell.
C. zygote.
D. stem cell.
E. sperm cell.
E. sperm cell.
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The genes needed for ?-carotene synthesis are not normally expressed in endosperm. In the creation of golden rice, how did researchers ensure that these genes were expressed in rice endosperm?
A) The genes were injected only in the endosperm of rice grains. B) Agrobacterium cells were added only to rice grains, not to any other part of the plant. C) The protein-coding sequence of each gene was linked to a regulatory region of DNA that directed transcription in endosperm. D) The wild-type genes were mutated and new mutant alleles that are expressed only in endosperm were selected.
By using simple microscopy techniques, it is possible to determine if a culture is contaminated with another organism
Indicate whether the statement is true or false.
Certain human cell types, such as skeletal muscle cells, have several nuclei per cell. Based on your understanding of
mitosis, how could this happen?
a. The cell undergoes repeated cytokinesis but not mitosis. b. The cell undergoes repeated mitotic divisions with concomitant cytokinesis. c. The cell undergoes repeated mitotic divisions but not cytokinesis. d. The cell undergoes anaphase twice before entering telophase. e. The cell goes through multiple S phases before entering mitosis.
All of the following are evidence of continental drift except:
a. distribution of earthquakes. b. age of rocks from the sea floor. c. reefs. d. analysis of core samples. e. paleomagnetism.