The bottom or base of a pyramid of energy consists of:
a. primary producers
b. secondary producers
c. primary consumers
d. secondary consumers
e. tertiary consumers
a
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If 14% of the nucleotides from a DNA molecule contain the base T, what percent will contain the base G?
A. 14% B. 18% C. 28% D. 36% E. 72% Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about base-pairing? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
If Peter is allergic to peanuts and Paul is not, what is the precise molecular difference in Peter's bloodstream responsible for this?
A. Peter's blood has mast cells and basophils carrying IgEs that match an antigen on peanuts. B. Peter's blood has a continually excessive level of histamines and prostaglandins. C. Paul's blood has mast cells and basophils with IgEs that confer immunotolerance to peanuts, but Peter's does not. D. Peter inherited a peanut-specific IgG gene from his mother or father, while Paul did not.
According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate?
A) from infoldings of the plasma membrane, coupled with mutations of genes for oxygen-using metabolism B) from engulfed, originally free-living prokaryotes C) by tertiary endosymbiosis D) from the nuclear envelope folding outward and forming mitochondrial membranes E) when a protoeukaryote engaged in a symbiotic relationship with a protobiont
An extremely rare occurrence in humans is a multiple pregnancy with the embryos at different stages due to fertilization weeks apart. What mechanism normally prevents this from happening?
A. The embryo's secretion of hCG maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. B. The embryo's secretion of FSH and LH maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. C. The follicle's secretion of polar bodies maintains the fimbriae, keeping estradiol and progesterone high until the fallopian tube takes over secretion of these hormones. D. The embryo's secretion of GnRH maintains the corpus luteum, keeping FSH and LH high until the placenta takes over secretion of these hormones.