Hox genes Study guides, Class notes & Summaries

Imagine you are a scientist who has discovered a new organism on a scientific expedition. What specific characteristics would you investigate in order to determine if it is an animal? Correct Answer Some features to investigate would include the type of nutrition (autotrophy vs. heterotrophy), digestion (internal or external), movement, presence of sensory apparatus, the types of junctions between cells, presence of Hox genes, and the type of extracellular matrix present in the organism. Beca...

Ectoderm doesn't move through the __________ or __________ - CORRECT ANSWER 1) blastopore (frogs and fishes) or 2) primitive streak (birds and humans) Sensory organs all begin in the head as... - CORRECT ANSWER placode - thickenings of surface ectoderm what are 4 types of cell interactions? - CORRECT ANSWER 1) Internal/mechanical 2) Juxtacrine signaling 3) Paracrine signaling 4) Endocrine signaling Note: these are arranged in order of closest interaction to longest distance interactio...

OSMT Exam Questions with verified Solutions 100% Solved 2024 Why doesn't phylogenetic systematics have a fixed number of hierarchical categories like Linnaean systematics? - answerEach branching point is a hierarchical level in the nested structure of phylogenetic systematics. The number of branching points—and therefore the number of possible hierarchical levels—varies substantially from one lineage to another. What aspect of evolution does phylogenetic systematics represent more c...

Biology Midterm 2 Study Guide Exam Questions With Verified Answers which of the following is responsible for the formation of alpha-helices and beta-pleated sheets in a protein? a. ionic bonding between polypeptide subunits b. hydrogen bonds between R-groups of amino acids c. disulfide bonds between cysteine R-groups d. hydrogen bonding within with protein backbone - answerd. hydrogen bonding within the protein backbone secondary structure such as alpha helices and beta-plated sheets fo...

Morphogenesis - ANSWER When cells divide, the cell will change shape/organization many times by going through a succession of stages -A single-celled egg develops into a complex, multi-cellular organism by dividing and going through many stages in this process Order of Embryological Development - ANSWER Morula-->Blastula-->Gastrula-- >Neurla Zygote-Cleavage--Morula-Blastula, Gastrula, Neurla, Organogenesis Fertilization triggers the zygote to go through a series of rapid cell div...

DAT Biology (ALL Practice Exam Questions) with Certified Solutions An organism is found during a biopsy of lung tissue. It is determined to belong to the genus Streptococcus and is known to cause tuberculosis. What type of organism is this? Bacteria A botanist has discovered a new plant and notes that it is predominantly found in its gametophyte form. Which category does this plant most likely belong to? Bryophyte In the fetal circulatory system, the ductus venosus allows blood to bypass? Liv...

final exam all bio 4400, Cell Fate and Specification, Exam 2: Neurulation, Exam 2: Neurons, Exam 2 - Neural Crest cells, Exam 2: Sensory placodes and organs, Cell-cell interactions and signaling Ectoderm doesn't move through the __________ or __________ - CORRECT ANSWER 1) blastopore (frogs and fishes) or 2) primitive streak (birds and humans) Sensory organs all begin in the head as... - CORRECT ANSWER placode - thickenings of surface ectoderm what are 4 types of cell interact...

What is biological evolution? - Heritable change in a population across many generations. What is the difference between microevolution and macroevolution? - Microevolution is on a small scale. It is a change in a single gene. Macroevolution is on a large scale and results in the formation of a new species. What is a scientific theory (definition)? - A well-tested concept that explains a wide range of observations. What is catastrophism? - The idea presented by Georges Cuvier that major...

OSMT Exam Questions with verified Solutions 100% Solved 2024 Why doesn't phylogenetic systematics have a fixed number of hierarchical categories like Linnaean systematics? - answerEach branching point is a hierarchical level in the nested structure of phylogenetic systematics. The number of branching points—and therefore the number of possible hierarchical levels—varies substantially from one lineage to another. What aspect of evolution does phylogenetic systematics represent more cle...

NBME practice exam #1 Questions Answered 100% correct 2023 Mitotic cyclin synthesis G2 phase Vitamin E def anemia Hemolytic anemia~ red antioxidants vs B12 def (megaloblastic macrocytic anemia) Hemolysis~ dec Hgb/hematocrit, inc LDH (normal MCV), and neurologic symptoms vs B12 def: dec Hgb/hematocrit, inc MCV, and neurologic symptoms (dorsal column) Volume of distribution Vd = (amount of drug in the body) / (plasma drug concentration) Achondroplasia Endochondria...