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PCAT Biology Reproduction

Subjects : pcat, biology
  • Answer 50 questions in 15 minutes.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Steroid hormones necessary for normal female maturation -stimulate the development of the female reproductive tract and contribute to the development of secondary sexual characteristics and sex drive -responsible for the thickening of the endometrium

2. The spindle apparatus disappears. A nuclear membrane forms around each set of newly formed chromosomes. Thus - each nucleus contains the same number of chromosomes (the diploid number 2n) as the original or parent nucleus. The chromosomes uncoil - re

3. Spore formation - vegetative propagation - and Artificial Vegetative Propagation

4. Stems running above and along the gorund - extending form the main stem -can produce new roots and upright stems

5. Menstrual flow

6. Surrounded by two layers of cells

7. Part of embryo that is the precursor of the upper stem and leaves

8. Central region where - after replication - the chromosomes consist of two identical sister chromatids held together in interphase

9. The development of an unfertilized egg into an adult organism

10. The production of female gametes -occurs in the ovarian follicles

11. Outer layer of oocyte cell membrane

12. Haploid gametophyte gneration produces gametes by mitosis -gametophytes reproduce sexually - whereas the sporophyte gneration reproduces asexually

13. Production of offspring without fertilization -form new organisms by a single parent cell -offspring are genetic carbon copies of their parent cells -genetically identical to the parent cells (except mutations) -ex: fission - budding - regeneration -

14. Regrowth of a lost or injured body part

15. Hormonal secretions of the ovaries - the hypothalamus - and the anterior pituitary play important roles in the female reproductive cycle -divided into the follicular phase - ovulation - the luteal phase - and menstruation

16. Consists almost entirely of the nucleus - which contains the paternal genome

17. Meristems provide a source of cells that can develop into an adult plant -can occur naturally or through human intervention -advantagous because it introduces no genetic variation and is a rapid form of reproduction

18. Caplike structure - derived from the Golgi apparatus - develops over the anterior half of the head -contains enzymes needed to penetrate the tough outer covering of the ovum

19. Some species of plants have flowers that contain only stamens and other flowers that contain only pistils

20. Diploid cells of spermatogonia

21. Division and distribution of the cell's DNA to its two daughter cells such that each cell receives a complete copy of the original genome

22. Have one cotyledon

23. Centriole pairs are now at opposite poles of the cell

24. Found in the tips of roots and stems where growth in length occurs

25. (In Anaphase I) homologous pairs separate and are pulled to opposite poles of the cell -accounts for a fundamental Mendelian Law -each chromosome of paternal origin separates (or disjoins) from its homologue of maternal origin - and either chromosome

26. Contains elongated cell with head - tail - neck - and body

27. First barrier that the sperm must penetrate -enzymes secreted by the sperm aid in penetration of the corona radiata -arosome is responsible for penetrating the zona pellucida; it releases enzymes that digest this layer - thereby allowing the sperm to

28. Specialized sex cells

29. Common passageway for both the reproductive and exretory systems

30. The site of sperm deposition during intercourse and is also the passageway through which a baby is expelled during childbirth

31. Very similar to mitosis - except that meiosis II is not preceded by chromosomal replication -chromosomes align at the equator - separate and move to opposite poles - and are surrounded by a reformed nuclear membrane -new cells have the haploid number

32. Inner layer of oocyte cell membrane

33. Have both functional male and female gonads

34. Egg

35. Part of embryo that develops into the lower and root

36. Underground stems with bubs - like the eyes of potatoes - that can develop into adult plants

37. Diploid cells that undergo meiosis to produce four haploid sperm of equal size

38. The male organ of the flower and consists of a thin - stalk-like filament

39. The production of female gametes - occurs in the ovaries

40. Expanding partition that grows outward from the interior of the cell until it reaches the cell membrane

41. Differs from asexual reproduction in that there are two parents involved and the end result is a geneticaly unique offspring -fusion of two gametes

42. Method of growth - development - and replacement of worn-out cells

43. Reproductive structure of angiosperms

44. When a diploid sporophyte generation produces ahaploid (monoploid) spore by meiosis - spores divide by mitosis to produce the haploid - or gametophyte - generation

45. Specialized cells with hard coverings that prevent loss of water

46. Uncoiled DNA

47. Produces monoploid spores that develop into pollen grains

48. Nuclear membrane forms around each new nucleus -at this point - each chromosome still consists of sister chromatids joined at the centromere

49. AKA stolon -woody - underground stems -can develop new upright stems

50. After ovulation - LH induces the ruptured follicle to develop into the corpus luteum