An ecological niche
A) is formed by the physical environment only.
B) is a constantly changing place.
C) is the same thing as a habitat.
D) cannot be shared by two species.
E) depends on the weather.
D
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The concentration of virus that infects or kills 50% of the host cells is referred to as the
A. LD50. B. ID50. C. ID100. D. LD100. E. LD50 AND ID50.
Who was the first person acknowledged to have seen living, moving cells by using a microscope?
a. Robert Hooke b. Robert Brown c. Galileo Galilee d. Rudolf Virchow e. Anton van Leeuwenhoek
The ability to roll the edges of the tongue upward in a U-shape is considered to be an inherited trait. The standard assumption is that tongue-rolling is a dominant allele at a single gene locus. Which of the following would cast doubt on this assumption? Select all that apply.A) A student who can roll his tongue has both a mother and father who cannot.B) In a large research study, the majority of tongue-rollers were male.C) A research study with 1,000 participants reports that most non-tongue-rollers can learn to roll their tongues.D) A student who cannot roll his tongue has both a mother and father who can.
What will be an ideal response?
Which of these observations gives the most support to the endosymbiotic theory for the origin of eukaryotic cells?
A) the existence of structural and molecular differences between the plasma membranes of prokaryotes and the internal membranes of mitochondria and chloroplasts B) the similarity in size between the cytosolic ribosomes of prokaryotes and the ribosomes within mitochondria and chloroplasts C) the size disparity between most prokaryotic cells and most eukaryotic cells D) the observation that some eukaryotic cells lack mitochondria