Wheat is a group of grass species. Cultivation originated in the eastern Mediterranean about 10,000 years ago
In comparison to closely related wild grasses, cultivated wheat has
shorter stalks and fewer, larger seeds that are firmly attached to the stalk and are unable to
disperse via wind like other grasses. Which of the following provides an explanation as to
why wheat is so successful despite the loss of seed dispersal?
A. Wheat seeds are dropped below the
parent plant and will grow the following
season. This maintains the worldwide
distribution of wheat.
B. Wheat seeds are collected and dispersed
by humans. Their worldwide distribution
increases every time a new field of wheat is
planted.
C. Wheat seeds have evolved to be
consumed by animals. Wheat seeds no
longer rely on wind as its dispersal
mechanism.
D. Wheat seeds are not required for
reproduction. Because it is a grass species, it
has asexual reproduction.
B
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Malaria is caused by Plasmodium falciparum, a nonmotile protist that contains a cluster of microtubules at one end of the cell. Once injected into the bloodstream, these microtubules are used to attach to red blood cells. Malaria is transmitted by the bite of a
A. tsetse fly. B. sand fly. C. kissing bug. D. mosquito. E. house fly.
Which one of the following does not apply to proteins?
A. The sequence of amino acids determines the identity of the protein. B. Some proteins have a transport function. C. Proteins are polymers of amino acids. D. Proteins can be enzymes. E. The main function of protein is energy storage.
Which of the following does not contain DNA in any cell type?
1.nucleus 2.cytoplasm 3.mitochondrion 4.none of the choices (all may contain DNA)
What characteristic is unlikely to be associated with arctic tundra?
a. a perpetually waterlogged soil b. rapid nutrient recycling c. one of the world's greatest store of carbon d. permafrost e. cool, anaerobic conditions