Why is it so difficult for scientists to know how many species have already been described?
A) Scientific journals do not publish accounts of new species.
B) There isn't one location for cataloguing all species.
C) Scientists are too busy testing hypotheses to investigate the number of species on Earth.
D) Many species are microscopic, so they are difficult to study.
B
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Because DNA strands are antiparallel, DNA replication at a single replication fork proceeds
A) continuously on both strands. B) continuously on one strand and discontinuously on the other. C) discontinuously on both strands. D) continuously on both strands for a time and then discontinuously.
A homeotic gene
A) determines which end of the egg will become the head and which end will become the tail. B) serves as a master control gene that functions during embryonic development by controlling the developmental fate of groups of cells. C) represses gene transcription and promotes mRNA translation. D) is found only in adult somatic cells.
What will six cycles of the Calvin cycle produce?
What will be an ideal response?
Receptors for activated complement proteins are found on ____
a. dendritic cells, macrophages, and neutrophils b. mast cells, macrophages, and neutrophils c. dendritic cells, B lymphocytes, and neutrophils d. dendritic cells, eosinophils, and macrophages e. monocytes, T lymphocytes, and B lymphocytes