What is an estrous cycle?
What will be an ideal response?
All female placental mammals replace their uterine lining on a cyclic basis. However, most have an estrous cycle, rather than a menstrual cycle. In an estrous cycle, the endometrial lining is reabsorbed rather than shed, so the female never menstruates.
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Serious acute cases of diphtheria are treated with antibiotics and
A) diphtheria antitoxin. B) diphtheria toxin. C) diphtheria toxoid. D) diphtheria antitoxin, diphtheria toxin, and diphtheria toxoid.
Many single-celled eukaryotes that normally exist in a haploid state reproduce asexually by:
A. meiotic cell division. B. binary fission. C. mitotic cell division. D. fusion.
The building blocks of nucleic acids are
a. amino acids. b. nucleotides. c. pentose sugars. d. phosphate groups. e. nitrogenous bases.
Amoebas move by
A. cilia. B. gliding mechanisms. C. flagella. D. pseudopods. E. All the choices are correct.