Using sunflower plants to naturally remove heavy toxins from contaminated soil is an example of ________.
A. the green revolution
B. bioremediation
C. biomagnification
D. land conservancy
Answer: B
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Which of these statements is true?
a. 75 percent of the causes of infertility remain unidentified. b. Long-term stress can cause early puberty and more frequent menstruation. c. Proper nutrition is an important factor in supporting fertility. d. In vitro fertilization involves injecting sperm into the uterus.
Active transport is different from simple diffusion because active transport
A. requires ATP. B. moves molecules against a concentration gradient. C. requires the use of proteins embedded within the cell membrane. D. moves molecules from an area of lower concentration to an area of higher concentration. E. All answers are correct.
When contracted, ________ prevents movement of chyme from the stomach to the small intestine
A) peristalsis
B) reverse peristalsis
C) the epiglottis
D) a sphincter
When G2 and M phase cells were fused together, the G2 nucleus became prematurely compacted when it was exposed to S phase cytoplasm in the fused cell. The G2 chromosomes could be seen to be visibly doubled. What conclusion was drawn from this result?
a) M phase cytoplasm contained diffusible factors that initiate DNA synthesis b) G2 nuclei cannot respond to diffusible factors present in M-phase cell cytoplasm c) the cytoplasm of the mitotic cell contained diffusible factors that could induct mitosis in a non-mitotic cell d) the cytoplasm of the G2 cell contained diffusible factors that could halt mitosis in a mitotic cell