Which of the following statements is not true of nitrogen-fixing bacteria?
A. They live in root nodules.
B. They are very common in symbioses with
plants from the legume family.
C. They are very common in symbioses in all
plant families.
D. Some are free-living in the soil.
E. They provide an important way that
biologically available nitrogen enters
ecosystems.
C
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The hantavirus contains a ________ genome
A) ssRNA B) dsRNA C) ssDNA D) dsDNA
Why are mitochondria so prevalent in skeletal muscle?
A) They give the muscle enough elasticity to contract. B) They are needed to repair damaged tissue that accumulates during exercise. C) They are needed to provide energy for muscle contraction. D) Bones and muscles require a great deal of energy to prevent them from separating. E) The flow of blood is greatest in skeletal muscle.
The Fc region on IgG
A. interacts with complement. B. attaches to receptors on macrophages. C. reacts with and coats the antigen. D. contains a variable region. E. interacts with complement AND attaches to receptors on macrophages.
Suppose 200 fish are marked and released in a pond. The following week, 200 fish are caught and 100 of them have marks. There are about ________ fish in this pond
Fill in the blank(s) with correct word