How do birth control pills prevent fertilization?
A. They alter the uterine environment so that sperm cannot survive.
B. They prevent implantation.
C. They inhibit menstruation.
D. They prevent follicle development and ovulation.
E. The provide hCG, indicating that fertilization has already occurred.
Answer: D
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Which of the following statements is false
regarding alcohol consumption during pregnancy? a. The developing embryo or fetus quickly absorbs alcohol across the placenta. b. Symptoms of fetal alcohol syndrome include reduced brain size and facial deformities. c. Cases of FAS are seriously underdiagnosed and misdiagnosed. d. The effects of FAS are temporary. e. Even occasional drinking may have negative effects
Along with a significant genetic component, ____________________ plays a significant role in the development of
spina bifida.Fill in the blank(s) with the appropriate word(s).
The human body has an incredibly efficient and powerful immune system capable of removing many potentially damaging pathogens and toxic agents that threaten the body
Knowing how efficient the human immune system is, explain why cancerous cells that threaten health can seemingly develop undetected.
You grow a culture of bacteria and split it into two culture tubes. One sample of bacteria you treat with calcium and the other is not treated. When you transform both samples with a plasmid, only the samples treated with calcium take up the plasmid. Which of the following best explains your results?
A. The bacteria use calcium as a source of energy to take up the DNA. B. Calcium precipitates DNA, preventing it from being taken up by cells. C. The bacteria require calcium to grow. D. DNA is degraded in the absence of calcium. E. The calcium makes the bacterial membrane more porous to DNA.