If a food chain consisted of grass to rabbits to foxes, what weight of foxes could be expected in a meadow that has 10,000 pounds of grass?
a) 10,000
b) 2000
c) 10
d) 100,000
e) 100
Answer: e) 100
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Double fertilization refers to
(a) fusion of two sperm nuclei and two egg cells. (b) fusion of one sperm nucleus with two polar nuclei and fusion of another with the egg cell nucleus. (c) maturation of the ovary into a fruit. (d) none of the above.
Which of the germ layers gives rise to most of the internal organ systems?
a. mesoderm b. ectoderm c. endoderm d. both the mesoderm and ectoderm
Transcription in archaea resembles transcription in bacteria in that archaea ________.
A. have operons, have introns, and use a single RNA polymerase to make all types of RNA B. lack operons, contain introns, and use a different RNA polymerase to make mRNA, tRNA, and rRNA C. contain operons, have few, if any, introns, and use a single RNA polymerase for transcription D. lack operons, lack introns, and use a different RNA polymerase to make mRNA, tRNA, and rRNA
Answer the following questions true (T) or false (F)
1. The human embryo goes through a period of time with gill slits, an inheritance from an ancient ancestor. 2. The so-called modern synthesis of evolution brought together the evidence for evolution and the ideas of genetics. 3. In science, theories are well established and thus are not "theoretical" in the everyday usage of the word.