How are bacteria important to the genus Rhizobium?
a. They provide fixed carbon dioxide to legumes.
b. They provide fixed nitrogen to legumes.
c. They carry out photosynthesis.
d. They carry out respiration.
e. They carry out decomposition
b
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Most mobile DNA consists of
A) transposable elements. B) introns. C) linear chromosomes. D) plasmids.
How is global warming related to the United States' and 7 other countries' presence in the Arctic? a. Global warming has caused oil fields to dry up in temperate zones forcing the search in the Arctic
b. Thawing ice flows is opening shipping lanes and allowing greater access to the Arctic, which these countries are exploiting. c. With global warming, people can work in the Arctic and be comfortable. d. Thanks to global warming, it is now environmentally safe to have an extended hunting season on polar bears.
If there are 32 sister chromatids in a normal somatic cell, how many chromosomes are there?
A. 32 B. 64 C. 16 D. 8
The microtubules that overlap in the center of the mitotic spindle are called _______ microtubules.
a. astral b. polar c. kinetochore d. central e. minus-end