________ is a two-step process that depends on the activity of at least two genera to carry out the oxidation of ammonia to nitrate.
Fill in the blank(s) with the appropriate word(s).
Nitrification
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Amoebae are characterized by:
A. locomotion by extension of pseudopodia B. possession of hard shells C. tertiary symbiosis D. causing cancer E. conjugation
In a motor unit, a motor neuron is connected with an average of 150 muscle fibers
____________________ Indicate whether the statement is true or false.
The embryo becomes implanted in the endometrium of the uterus due to:
a. special receptors on the endometrium to which the blastocyst attaches. b. enzymes secreted by the trophoblast, which erode an area of the endometrium for entry of the embryo. c. special phagocytic cells in the endometrium, which engulf the embryo. d. the sticky coat of the zona pellucida, which adheres to the endometrium. e. the action of hCG secreted by the embryo.
How would the shape of a DNA molecule change if adenine paired with guanine and cytosine paired with thymine?
A) The DNA molecule would be longer. B) The DNA molecule would be shorter. C) The DNA molecule would be circular. D) The DNA molecule would have irregular widths along its length.