Thalidomide is a chemical that was prescribed as a sedative in the early 1960s. Many women who took the drug during their first trimester gave birth to children with arm and leg deformities. What developmental process did this drug affect?
A) early cleavage divisions
B) determination of the polarity of the zygote
C) differentiation of bone tissue
D) morphogenesis
E) organogenesis
Answer: D) morphogenesis
You might also like to view...
Which part describes the non-reproductive female sexual organ that plays an important role in stimulating sexual arousal?
A. Vagina B. Uterus C. Penis D. Clitoris
To test the prediction that increased phosphorous levels in lakes lead to increased minnow populations, scientists survey 20 lakes across Minnesota, measuring phosphorous content and quantifying minnow abundances. This is an example of what type of scientific approach?
What will be an ideal response?
Dryland microbial habitats include ALL of the following EXCEPT
a. endolithic communities. b. biological soil crusts. c. epilithic communities. d. chemolithotrophic mats.
If GM crops can decrease pesticide use, why are environmentalists still concerned about them?
a. Trials involving biotech fruits and vegetables have increased dramatically in recent years. b. Inserted genes can spread to non-target species. c. The government funds most GM crop research. d. The FDA does not regulate them. e. There is no public opposition to GM crops.