Answer the following statements true (T) or false (F)
1. Parasitic relationships are typically loose associations between two species.
2. Character displacement is driven by competition.
3. Resource partitioning occurs between allopatric species.
4. Herbivory by rabbits on a grass species has an overall beneficial effect on the grass.
1. FALSE
When one organism feeds on another but does not normally kill it outright, the organism is termed a parasite, and the prey, a host. Some parasites remain attached to their hosts for most of their life. Being endoparasitic on a host seems to require greater specialization than ectoparasitism. Therefore, ectoparasitic animals such as leeches feed on a wider variety of hosts than do endoparasites such as liver flukes. Thus, host-parasite interactions are often tight in terms of proximity, duration, and specialization.
2. TRUE
3. FALSE
4. FALSE
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Based on this study, which of the following is true?
a. The researchers have proven their theory. b. The researchers have evidence to support their hypothesis. c. The data from the experiment is inconclusive. d. The researchers must run several more similar trials before their hypothesis is proven.
Why is it that some people are unable to digest the lactose contained in dairy products?
A) Lactose can only be digested by people who produce the appropriate amounts of lactic acid. B) Lactose-intolerant people do not produce lactase, the enzyme needed to digest lactose. C) Some people do not produce any enzymes, including the one needed to digest lactose. D) The active site of the lactose enzyme can vary from person to person. E) Some people have an internal body temperature higher than others, which allows the lactase enzyme to function more efficiently.
Facilitated diffusion of magnesium ions (Mg++) would occur out of a cell if the Mg++ concentration was ________ outside the cell than inside, and ________.
A) higher; Mg++ could move directly through the phospholipid bilayer of the membrane B) lower; Mg++ could move directly through the phospholipid bilayer of the membrane C) the same; Mg++ could move directly through the phospholipid bilayer of the membrane D) higher; Mg++ could move through a transport protein across the membrane E) lower; Mg++ could move through a transport protein across the membrane
In the absence of recombination, how many genetically different types of gamete can an organism with five homologous chromosome pairs produce?
(a) 5 (b) 10 (c) 32 (d) 64