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5 Written questions

5 Matching questions

  1. Stages of Mitosis
  2. Gonads
  3. Metaphase I
  4. Primary Oocyte
  5. Cortical Reaction
  1. a - homolgous pairs (tetrads) align at the equatorial plane
    - each pair attaches to a separate spindle fiber by its kinetochore
  2. b PMAT:
    a) Prophase
    b) Metaphase
    c) Anaphase
    d) Telophase
  3. c - male: testes
    - female: ovaries
  4. d - triggered by acrosomal reaction
    - calcium ions released into the cytoplasm, initates a series of reaction to form the fertilization membrane
    - calcium ion also stimulates increase in ovum's metabolic rate
    - this is followed by fusion of the sperm nucleus with ovum nucleus to form a diploid zygote
  5. e - immature ova
    - diploid cells that form by mitosis in the ovary
    - at birth, all of the primary oocyte that a female will produce during her lifetime are already in her ovaries

5 Multiple choice questions

  1. where sperm acquire motility and stored here till ejaculation
  2. - prokaryotes' way of of cell division
    - a type of asexual reproduction
    - splits into two equal halves, each daughter cell receives a complete copy of the original chromosome
  3. - cap-like structure, over the anterior half of mature sperm's head
    - derived from Golgi apparatus
    - contains enzymes to penetrate the tough outer covering of the ovum
    - once in contact with ovum cell membrane, sperm forms a tubelike structure called the acrosomal process
    - acrosomal process extends and fuses with ovum and enters the ovum's cytoplasm
  4. - happens at the end of telophase
    - cytoplasm divides into two daughter cells
    - in animal cells, a cleavage furrow forms, cell membrane indents along the equator of the cell and cell split
  5. - spermatogonia (diploid) differentiate into primary spermatocytes (diploid)
    - primary spermatocytes undergo the first meiotic division and yield two secondary spermatocytes (haploid)
    - secondary spermatocytes undergo second meiotic division and yield four spermatids (haploid)
    - spermatogonia (2N) --> 1° spermatocytes (2N) --> meiosis I --> 2° spermatocytes (N) --> spermatids (N) --> spermatozoa (N)

5 True/False questions

  1. Budding- replication of the nucleus followed by unequal cytokinesis
    - the cell membrane pinches inward to form a new cell that is smaller in size but genetically identical to the parent cell
    - can grow to an adult size
    - new cell may separate immediately from the parent or remain attached to it
    - occurs in hydra and yeast

          

  2. Fertilization Membrane- women ovulate about once every four weeks
    - menapause occurs between age 45 and 50
    - during menopause, ovaries become less sensitive to the hormones that stimulate follicle development (FSH and LH), and eventually they atrophy
    - remaining follicles disappear, estrogen and progesterone levels greatly decline and ovulation stops

          

  3. The Cell Cycle- four stages: G₁, S, G₂ and M
    - interphase: first three stages
    - mitosis includes the actual cell division

          

  4. Metaphase- chromosomes align

          

  5. S Stage (synthesis)- each chromosome is replicated so that during division, a complete copy can be distributed to each daughter cell
    - two identical sister chromatids held together at a region called the "centromere"
    - telomeres: ends of the chromosomes
    - 2 x 2N number of chromosomes