What is a Hartig net?
a. an ecosystem containing lichen that act as both producers and decomposers
b. layer of fungi that surround roots, forming a thick exterior sheath
*c. formation of hyphae enveloping the outer layer of root cells inside the mantle
d. sticky, hair-like fungus that hang from tree branches to catch and digest insects
15. What are endophytes?
a. Decomposing fungi that live on rotting plant and animal matter, breaking it down.
b. Pathogenic fungi that live inside animals and destroy tissues by releasing toxins.
c. Mutualistic fungi that live inside plants and provide their hosts with various benefits.
d. Symbiotic fungi that live on tree bark without disturbing or benefitting their hosts.
c. Mutualistic fungi that live inside plants and provide their hosts with various benefits.
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In fish, countercurrent exchange involves water flowing over gills and blood flowing through gill capillaries in opposite directions. This increases gas exchange by creating a(n):
a. larger surface area b. osmotic gradient c. concentration gradient d. reservoir for gas e. source of new hemoglobin
Organic molecules are defined as chemical compounds that contain in distinct ratios and structures.
A. carbon and nitrogen B. carbon and oxygen C. carbon D. carbon and hydrogen E. carbon, hydrogen, and nitrogen
At the end of gastrulation, which of the following are produced?
a. hollow balls of cells b. embryos with germ layers c. solid balls of cells d. maternal messages e. blastocyst
The following table compares various methods of hormonal birth control for women. Fill in each blank with the appropriate information
Method How is it used? Be specific on timing issues! What hormones does it contain? Oral contraception (combination birth control pills) 21 days of active pills followed by 7 days off Estrogen and progesterone DepoProvera injection Implanon Ortho Evra (patch) NuvaRing In general, how do all these methods work to prevent pregnancy? Be detailed, and include all the relevant hormones.