Estrogen and progesterone exhibit which type of hormone interaction?
a. synergistic
b. permissive
c. opposing
d. unrelating
e. mutual
B
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One example of an innovation from an unexpected source comes from studies of tumor-like plant growths. What information did the study of plant tumors provide that was critical for plant genetic engineering?
A) understanding the role of plant hormones in growth promotion B) knowledge of plant tumor suppressor and proto-oncogenes C) learning that metastasis is critical for tumor progression D) learning the biosynthetic pathway to ?-carotene E) discovery of a plasmid that could be modified to introduce genes into plants
What is the main cause of carbon dioxide build-up in the atmosphere?
a. burning fossil fuels b. deforestation c. droughts d. flooding e. respiration due to overpopulation
A particular species of protist has obtained a chloroplast via secondary endosymbiosis. You know this because the chloroplasts _____
A) have nuclear and cyanobacterial genes B) are exceptionally small C) have three or four membranes D) have only a single pigment
The spindle fibers are produced by the
A) nucleus. B) chromosomes. C) centrioles. D) chromatin.