Embryos - Study guides, Class notes & Summaries

AP Biology Final Exam Review with Complete Solutions acquired immunity immunity that the body develops after it overcomes a disease, or through inoculation (such as vaccination) acrosomal reaction the discharge of hydrolytic enzymes from the acrosome, when the sperm contacts an egg action potential a neural impulse; a brief electrical charge that travels down an axon; the action potential is generated by the movement of positively charged atoms in and out of channels in the axon...

IB Biology Topic 1: Cell Biology Questions and Answers Already Passed What does cell theory state? That cells are the smallest possible unit of life and that living organisms are made up of cells. What are unicellular organisms? Give two examples Unicellular organisms are organisms with only one cell, such as Paramecium and Chlamydomonas. In unicellular organisms the one cell carries out all of the functions of life. Why are large organisms multicellular? Because of surface area to ...

Steps of embryonic development Correct Answer-1) Zygote (fertilized egg) undergoes early cleavages -> morula (group of equivalent, undistinguishable cells) 2) As morula grows, cell acquires specific characteristics & some morphological differences (ex. embryonic axes) -> blastula (characterized by presence of hollow cavity, blastocele) 3) Gastrulation (gastrula) originates 3 definitive germ layers (ectoderm, mesoderm, endoderm) 4) Once scaffold & primordial for tissues & organs laid out...

mollusca body plan shared features -foot: mass of muscle tissue used for movement and/or manipulation -visceral mass: clump that contains most of the organs -mantle: tissue that drapes over the organ clump and secretes the shell in shelled members 4 characteristics shared by all animals -eukaryotic- membrane bound nucleus and organelles -multicellular -heterotrophic- consumes food to get energy -have tissues that develop from embryonic layers (germ layers) germ layer formation step 1 spe...

Cnidocyte - ANSWER A specialized cell unique to the phylum Cnidarian; contains a capsule-like organelle housing a coiled thread (nematocyte) that, when discharged explodes outward and functions in prey capture or defense Ectoderm (Cnidarians) - ANSWER The outer most layer of the three primary germ layers in animal embryos; gives rise to the epidermis and in some phyla, the nervous system, inner ear and lens

charophytes - (aquatic) green algae land plants evolved from 3 key traits land plants share with charophytes - 1. rings of cellulose-synthesizing proteins embedded in plasma membrane 2. formation of a phragmoplast (helps form cell wall) 3. structure of flagellated sperm (not all will have this) adaptations enabling plants' move to land: why? - 1. CO2 2. sunlight 3. soil- nutrients 4. fewer predators/pathogens (never been seen before) adaptations enabling plants' move to land: problems...

CMMB 403 Midterm Question and answers correctly solved 2024 Two major changes of the mid-blastula transition - correct answer 1. Changes in the length of the cell cycle 2. Activation of zygotic genes Key aspects of gastrulation (3) - correct answer 1. Blastula turns into gastrula 2. Formation of blastopore 3. Germ layers move into their final positions What is a blastopore - correct answer Opening of central cavity in embryos Key aspects of organogenesis (3) - correct answer 1...

Green plant phylogeny ANSWER: - green algae and land plants share a common ancestor - all green plants are photo autotrophic but not all photo autotrophic plants are green 2 major groups of green algae ANSWER: - chlorophytes: never made it to land - charophytes: sister group to all land pants - ancestral charophytes species gave rise to land plants - streptophytes have charophytes and land plants - land plants have multicellular haploid and diploid stages and diploid embryos(not foun...

All IB Biology Processes Latest Update with Verified Solutions Stem Cell Therapy 1. triggering the differentiation of stem cells into desired cell type 2. surgical implantation of differentiated cells into patients tissue 3. suppression of immune system so they do not get destroyed 4. monitoring so they are not cancerous eg. Stagardt's Disease (old retina cells --> new retina cells) Leukemia (bone marrow transplant) Somatic cell nuclear transfer - creation of embryonic clones...

IB Biology Paper 1 Questions And Answers Already Passed Prokaryote or Eukaryote in paramecium? Compartments in the cell indicates that it's a eukaryote Property of water which makes it suitable for living? Thermal Watson and Crick discovery about DNA DNA is double helix What occurs in meiosis but not in mitosis? Homologous chromosomes pair up Variation within a population Fertilization and mutation properties of stem cells they can differentiate phospholipid bilayer the...