The structure labeled 2 in Figure 51-1 is the:a
endoderm layer.
b. mesoderm layer.
c. blastopore.
d. blastocoel.
e. archenteron
D
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In sewage treatment, the removal of phosphates and nitrogen compounds is achieved during
A. primary treatment. B. secondary treatment. C. advanced treatment. D. quaternary treatment.
Which of the following proteins-functions is mismatched?
A. DNA polymerase-DNA synthesis. B. DNA polymerase-primer removal and replacement with DNA. C. DNA primase-production of RNA primer. D. topoisomerase-separates double-stranded DNA into single strands. E. single-stranded binding proteins-prevents single DNA strands from reforming into a double helix.
Suppose you are a botanist and you discover a plant that has xylem and phloem. Into which group should you NOT classify this plant?
a. ferns b. angiosperms c. gymnosperms d. bryophytes
An inherited disease results from abnormal mitochondria passed from mother to child. Using your knowledge of mitochondria's function within human cells, which of the following is the most likely description of the symptoms of this disease?
a) color blindness b) inability to absorb iron, resulting in extreme anemia c) extreme sensitivity to mutagens such as x-rays and sunlight, increasing the chance of cancer d) fragile bones and arthritis e) extreme muscle weakness