Plants have associations below ground with
a) mycorrihizal fungi
b) nitrogen-fixing bacteria
c) biofilms of microbes
d) all of the above
Ans: d) all of the above
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Answer the following statement(s) true (T) or false (F)
1. Animals with pentaradial symmetry have 5 planes of symmetry. 2. All mammals have hair, mammary glands, and a placenta. 3. Closing the stomata for an extended period of time would lead to an increase in G3P in the mesophyll cells. 4. If the soil around a plant is treated with a fungicide, the plant may experience a decline in DNA synthesis. 5. Cavitation would have no effect on translocation.
Parapatric speciation occurs most often
a. within in the same home range. b. when a population extends across different habitats within the same home range. c. within a group of interbreeding populations. d. on either side of geographic barriers. e. by polyploidy.
Males tend to be affected in greater numbers by X-linked recessive genetic disorders than are females
because a. females have two dominant genes for the disorder. b. males have only one X chromosomes. c. males have a double dose of the gene. d. Y chromosomes are not as strong as X chromosomes. e. females have two dominant genes for the disorder and males have only one recessive gene for the disorder.
On average, how many red blood cells are there in a microliter of blood?
a. 5,000 b. 50,000 c. 500,000 d. 5,000,000 e. 50,000,000