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5 Written questions

5 Matching questions

  1. Reproduction
  2. Meiosis II
  3. G₂ Stage (postsynthetic gap)
  4. Meiosis
  5. M Stage (Mitosis)
  1. a - doesn't occur until fertilization
    - triggered when zona pellucida and corona radiata are penetrated by a sperm cell
    - fertilization yields two haploid cells, a mature ovum and another polar body
    - the mature ovum is a large cell containing a lot of cytoplasm, RNA, organelles and nutrients needed by a developing embryo
  2. b - cell continues to grow in size
    - assembly of new organelles and other cell structures continues
  3. c - mitosis: 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
    - cytokinesis: division of cytoplasm that follows
    - happens on somatic cells only
    - 2N --> 2N (ends up with two diploid cells)
  4. d - only occurs in the sex cells
    - meiosis I produces two intermediate daughter cells
    - meiosis II is similar to mitosis, it separates sister chromatids and results in four genetically distinct haploid gametes
  5. e - a process by which an organism perpetuates itself and its species
    - divided into: cell division, asexual reproduction and sexual reproduction

5 Multiple choice questions

  1. - result when a single zygote splits into two embryos
    - if splitting occurs at the two-cell stage of development, embryos will have separate chorions and separate placentas
    - if it occurs at blastula stage, embryos only have one chorionic sac and share a placenta (and probably amnion)
  2. - 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. - outer layer of the oocyte cell membrane
  4. where sperm acquire motility and stored here till ejaculation
  5. homologous chromosomes come together and intertwine

5 True/False questions

  1. Stages of Mitosis- mitosis: 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
    - cytokinesis: division of cytoplasm that follows
    - happens on somatic cells only
    - 2N --> 2N (ends up with two diploid cells)

          

  2. Vulva- 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

          

  3. Cell Division- a process where a cell doubles its organelles and cytoplasm, replicates its DNA and then divides in two
    - unicellular organism: reproduction
    - multicellular organism: growth, development & replace old cells

          

  4. Gonads- sperm and egg
    - produced in gonads

          

  5. Homologous Chromosomes- 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

          

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