Which of the following happens when there are high levels of nitrogen and phosphorus in a lake or pond?
a. The growth of algae decreases significantly.
b. The photic level gets deeper.
c. The growth of algae increases significantly.
d. Zooplankton populations increase.
c. The growth of algae increases significantly.
The growth of algae increases significantly when levels of nitrogen and phosphorus in a lake or pond increases. This can also shorten the depth of the photic layer and deplete oxygen levels.
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Two modular elements that appear as consensus sequences upstream from RNA polymerase II transcription start sites are ________
A) rDNA and nucleolar organizers B) TTAA and CCTT C) TATA and CAAT D) microsatellites and transposons E) enhancers and telomeres
Upon examination, a person is found to only have half the normal number of LDL-cholesterol receptors. Which of the following best explains this?
A. pleiotropic inheritance B. incomplete dominance C. X-linked inheritance D. polygenic inheritance
Why is it advantageous for cells to be small?
a. A small cell size prevents a cell from weighing too much. b. A small cell is better able to conserve energy than a larger cell. c. A small cell size occupies less space in nature where space is limited. d. A small cell has a small surface area relative to volume, thereby facilitating ion balance. e. A small cell has a small volume relative to surface area, thereby increasing efficient transport
In primitive land plants, such as mosses and ferns, how does the sperm get to the egg?
What will be an ideal response?