| A | B |
|---|
| Cell growth occurs during | Interphase |
| During interphase proteins | are manufactured |
| Cells eventually become too big | and they divide |
| Duplicate chromosomes are attached | at the centromere |
| Chromatids are | joined duplicates |
| Cell division begins with | mitosis |
| Cytokinesis is the process in which | cytoplasm divides into roughly two halves |
| Prophase | chromosomes begin to coil |
| Metaphase | paired chromatids move towads the centre of the cell |
| Anaphase | each pair of chromatids splits |
| Telophase | final stage of mitosis |
| Relatively rigid cell walls | plants |
| Cytokinesis | division outside the nucleus |
| Mutagens cause | cell mutations |
| Photodynamic therapy | destroying tumours with light |
| Cell reproduction is a form of | asexual reproduction |
| Binary fission occurs primarily | in one-celled organisms |
| A paramecium is a type of | protist |
| Starfish and flatworms reproduce by | fragmentation |
| Underground stems | are called rhizomes |
| Aall members of a clone have | identical genetic characteristics |
| Homologous chromosomes are made up of the same | kind of genes |
| Cells with homologous chromosomes are | diploid |
| Gametes | specialized reproductive cells |
| Meiosis | reduces the number of chromosomes |
| Starfish and planariums reproduce | by fragmentation and sexually |
| The eggs of salmon are fertilized | externally |
| Puberty | sexual maturity |
| Cowper's gland produces | one component of seminal fluid |
| Plural of ovum | ova |
| First cell of a new organism | zygote |
| External fertilization is only possible | for animals that reproduce in water |
| Anabolic steroids are derived | from male sex hormones |
| Estrogen | causes the lining of the uterus to thicken |
| Many sperm are required in | order to produce an enzyme |
| Progesterone | maintains the lining of the uterus |
