The organic matter in soil is referred to as
A. mineral soil.
B. inorganic substance.
C. bedrock.
D. humus.
D. humus.
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Biochemical tests are used to determine
A. nucleic acid-base composition. B. enzymatic activities. C. amino acid sequences. D. staining characteristics. E. All of the answers are correct.
When the placenta is delivered, what event allows secretion of prolactin and milk production?
A. a surge of adrenaline and endorphins B. sudden drop in progesterone and estradiol C. gradual drop in oxytocin D. sudden rise in FSH and LH
Conjugation is
1.the uptake of naked DNA from the environment. 2.mediated by bacteriophages. 3.when a copy of DNA from one bacterial cell enters another cell. 4.when one cell divides. 5.when DNA is exchanged between sexually reproducing organisms.
Fraternal twins arise from
a. fertilization of two eggs by two sperm. b. fertilization of two eggs by one sperm. c. a split of the morula. d. a split of the blastomere. e. cleavage of the zygote.