Which of the following is a true statement about monocots and eudicots?
a. Monocots have one cotyledon, and eudicots have two cotyledons.
b. Monocots have branched veins, and eudicots have parallel veins.
c. Monocots have a tap root, and eudicots have a network of roots.
d. Monocots include lilies and daisies, and eudicots include grasses.
a. Monocots have one cotyledon, and eudicots have two cotyledons.
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Explain how nutrient-rich runoff can cause waters to become hypoxic
A. Algae and cyanobacteria flourish on the nutrients in the run-off. Heterotrophic microbes then flourish on the organic molecules produced by these organisms, using oxygen in the process. This consumption of oxygen leads to a hypoxic state in the area. Larger animals cannot survive in the hypoxic area. B. Algae and cyanobacteria flourish on the nutrients in the run-off, using oxygen in the process. This consumption of oxygen leads to a hypoxic state in the area. Larger animals cannot survive in the hypoxic area. C. The nutrients in the run-off often include chemicals that spontaneously oxidize in the presence of oxygen. As such, they tend to deplete the amount of oxygen present in an area simply by being present themselves. This consumption of oxygen leads to a hypoxic state in the area. Larger animals cannot survive in the hypoxic area. D. It doesn't. This claim is a scare tactic used by environmental extremists to prevent farmers and individuals from fertilizing their crops and lawns. There is no induction of a hypoxic state in bodies of water where run-off occurs.
Which of the following is not involved in the increase in blood volume in a pregnant woman?
A. renin-angiotensin-aldosterone mechanism B. an increase in blood oxygen levels C. artery expansion D. progesterone E. sodium and water retention
A person with Klinefelter syndrome has 44 chromosomes and three sex chromosomes (XXY). The resulting aneuploidy is caused by
a. nondisjunction. b. crossing over. c. a mutation. d. an enzyme deficiency. e. failure of DNA to replicate.
When ________ and ________ are broken down excess nitrogen is released that must be eliminated by the excretory system.
A. proteins; salts B. glucose; fatty acids C. nucleic acids; sulfur D. amino acids; nucleic acids