Part A - Board of Studies
... 1 9. A biologist took a scraping of a diseased patch on the leaf of a plant. He cultured the scraping and found that a pure culture of bacteria developed. The bacterial growth in the culture dish may be responsible for the disease on the plant leaf. What steps would Koch have followed to determine t ...
... 1 9. A biologist took a scraping of a diseased patch on the leaf of a plant. He cultured the scraping and found that a pure culture of bacteria developed. The bacterial growth in the culture dish may be responsible for the disease on the plant leaf. What steps would Koch have followed to determine t ...
YEAR 11 IGCSE BIOLOGY REVISION GUIDE DBGS 1 Cells and
... (b) a higher osmotic potential (water potential) than its own cytoplasm. ...
... (b) a higher osmotic potential (water potential) than its own cytoplasm. ...
Skin
... • Rate of hair growth influenced by sex & age varies from one body region to another (about 2 mm a week) – Growth cycles – includes an active phase & resting phase – Follicles can become inactive for months at a time – Can lose up to 90 scalp hairs a day – Eyebrows = active for 3-4 months – inhibits ...
... • Rate of hair growth influenced by sex & age varies from one body region to another (about 2 mm a week) – Growth cycles – includes an active phase & resting phase – Follicles can become inactive for months at a time – Can lose up to 90 scalp hairs a day – Eyebrows = active for 3-4 months – inhibits ...
Biology Released Form - North Carolina Public Schools
... The yucca plant releases a strong scent at night when the yucca moth is active. The yucca moth, attracted by the scent, gathers pollen from the yucca flower. The yucca moth then deposits her eggs and the pollen on another plant. This ensures that the plant will be cross-pollinated and that the yucca ...
... The yucca plant releases a strong scent at night when the yucca moth is active. The yucca moth, attracted by the scent, gathers pollen from the yucca flower. The yucca moth then deposits her eggs and the pollen on another plant. This ensures that the plant will be cross-pollinated and that the yucca ...
TOPIC 5 Energy for biological processes 5.1 Cellular respiration
... membrane. As a result of the different hydrogen ion concentrations there is also a pH gradient. And because positive hydrogen ions are concentrated in the membrane space there is an electrochemical gradient too. All of these factors mean that there is a tendency for the hydrogen ions to move back in ...
... membrane. As a result of the different hydrogen ion concentrations there is also a pH gradient. And because positive hydrogen ions are concentrated in the membrane space there is an electrochemical gradient too. All of these factors mean that there is a tendency for the hydrogen ions to move back in ...
Biology RTQs - Standardized Testing and Reporting (CA Dept of
... same amino acid can have many different properties. CSB00157 ...
... same amino acid can have many different properties. CSB00157 ...
It`s Alive!!! Or is it???
... • Taking Food Other organisms are called consumers because they must eat (consume) other organisms to get food. Decomposers are consumers that get their food by breaking down the nutrients in dead organisms or animal wastes. ...
... • Taking Food Other organisms are called consumers because they must eat (consume) other organisms to get food. Decomposers are consumers that get their food by breaking down the nutrients in dead organisms or animal wastes. ...
gce marking scheme
... H. Significance of this for living at altitude / low PPO2 I. More O2 delivered to tissues J. Reduced affinity for O2 at lower partial pressures K. Bohr Effect reduces haemoglobin affinity for O2 / more O2 is delivered to ...
... H. Significance of this for living at altitude / low PPO2 I. More O2 delivered to tissues J. Reduced affinity for O2 at lower partial pressures K. Bohr Effect reduces haemoglobin affinity for O2 / more O2 is delivered to ...
2017 Year 11 Human Biology ATAR Couse Outline
... ribonucleic acid (RNA) in the nucleus, and translation into an amino acid sequence at the ribosome with the aid of transfer RNA (2) ...
... ribonucleic acid (RNA) in the nucleus, and translation into an amino acid sequence at the ribosome with the aid of transfer RNA (2) ...
XVIII. Biology, High School - Massachusetts Department of
... taxonomic relationship between the woodchuck and the long-tailed marmot? ...
... taxonomic relationship between the woodchuck and the long-tailed marmot? ...
explanation - mbhsbiologystaar
... code for all organisms and almost without exception, the same sets of 3 nucleotides (codons) code for the same amino acids, therefore human proteins can be produced by bacteria (we currently do this with insulin and human growth hormone) • The other answers are not correct because – bacteria do not ...
... code for all organisms and almost without exception, the same sets of 3 nucleotides (codons) code for the same amino acids, therefore human proteins can be produced by bacteria (we currently do this with insulin and human growth hormone) • The other answers are not correct because – bacteria do not ...
Global Learning Semesters
... 1. Cell Division: Mitosis and Meiosis 2. Human Genetics: Karyotypes and Pedigrees 3. Mendelian Inheritance, 4. Chromosomes structure function 5. The Molecular Basis of Inheritance: Watson and Crick Model of DNA. ...
... 1. Cell Division: Mitosis and Meiosis 2. Human Genetics: Karyotypes and Pedigrees 3. Mendelian Inheritance, 4. Chromosomes structure function 5. The Molecular Basis of Inheritance: Watson and Crick Model of DNA. ...
View as PDF - Arkansas Cystic Fibrosis Care Center | ACFCC
... We know parents worry and have many questions when they find out their child is diagnosed with CFTR-related metabolic syndrome (CRMS). A diagnosis of CRMS does not mean your child has cystic fibrosis (CF). But, you will need to learn about CF to better understand what it means for your child to have ...
... We know parents worry and have many questions when they find out their child is diagnosed with CFTR-related metabolic syndrome (CRMS). A diagnosis of CRMS does not mean your child has cystic fibrosis (CF). But, you will need to learn about CF to better understand what it means for your child to have ...
Chapter 19: Prenatal Development and Birth
... fetus’s blood can be higher than that of the mother and remain higher for a longer period of time. An elevated alcohol level can result in permanent damage to the fetus and a condition known as fetal alcohol syndrome (FAS), a group of alcohol-related birth defects that includes both physical and men ...
... fetus’s blood can be higher than that of the mother and remain higher for a longer period of time. An elevated alcohol level can result in permanent damage to the fetus and a condition known as fetal alcohol syndrome (FAS), a group of alcohol-related birth defects that includes both physical and men ...
Biology - PCMBToday
... grows upward enclosing the ovary completely and getting fused with it, the other parts of flower arise above the ovary. 25. Assertion : The aestivation of corolla or petals in flower of pea plants is known as vexillary. Reason : In flower of pea plant, the largest petal (standard) overlaps the ...
... grows upward enclosing the ovary completely and getting fused with it, the other parts of flower arise above the ovary. 25. Assertion : The aestivation of corolla or petals in flower of pea plants is known as vexillary. Reason : In flower of pea plant, the largest petal (standard) overlaps the ...
Douglas Bishop, Ph.D. Dr. Bishop`s group focuses on the
... are exposed to radiation. DNA repair is relevant to cancer in two ways. First, when normal cells fail to repair DNA, mutations occur and these mutations can lead to cancer. Second, many effective cancer treatments, such as radiation treatment, and some forms of chemotherapy, work because they kill t ...
... are exposed to radiation. DNA repair is relevant to cancer in two ways. First, when normal cells fail to repair DNA, mutations occur and these mutations can lead to cancer. Second, many effective cancer treatments, such as radiation treatment, and some forms of chemotherapy, work because they kill t ...
cell transport notes
... membrane in order to maintain homeostasis. Transport across membranes may not require energy (diffusion, osmosis) or require energy (active transport). ...
... membrane in order to maintain homeostasis. Transport across membranes may not require energy (diffusion, osmosis) or require energy (active transport). ...
Unit B2 - The Components of Life
... If the “loop” on this image is measured to be 20cm tall at a magnification of 100x how big is it really? ...
... If the “loop” on this image is measured to be 20cm tall at a magnification of 100x how big is it really? ...
The Organism as the Subject and Object of Evolution
... traits that have a one-to-one correspondence to genes. Mendel succeeded where others had failed partly because he worked with horticultural varieties in which major differences in phenotype resulted from alternative alleles for single genes. Mendel's peas had a single gene difference between tall an ...
... traits that have a one-to-one correspondence to genes. Mendel succeeded where others had failed partly because he worked with horticultural varieties in which major differences in phenotype resulted from alternative alleles for single genes. Mendel's peas had a single gene difference between tall an ...
Document
... If the “loop” on this image is measured to be 20cm tall at a magnification of 100x how big is it really? ...
... If the “loop” on this image is measured to be 20cm tall at a magnification of 100x how big is it really? ...
AP Biology
... 2519.Which of the following best describes the theory of serial endosymbiosis? (A) A prokaryotic cell takes up genes from the surrounding environment. (B) An organism will benefit from the symbiotic relationship, while neither is harmed. (C) Cyanobacteria synthesize food and restore oxygen to the at ...
... 2519.Which of the following best describes the theory of serial endosymbiosis? (A) A prokaryotic cell takes up genes from the surrounding environment. (B) An organism will benefit from the symbiotic relationship, while neither is harmed. (C) Cyanobacteria synthesize food and restore oxygen to the at ...
Syllabus - Frenship
... We are on a block schedule with 86 minute long sections that meet every other day. This is not as much time as you would be required to attend a college laboratory biology class. It is critical that you are prepared for class and work to your fullest potential. I am at school before 7:50 every morni ...
... We are on a block schedule with 86 minute long sections that meet every other day. This is not as much time as you would be required to attend a college laboratory biology class. It is critical that you are prepared for class and work to your fullest potential. I am at school before 7:50 every morni ...
7. Biology Glossary
... one-celled organisms that form phytoplankton as well as the seaweeds. Although algae photosynthesise and their cells are surrounded by a cell wall, they are not plants. They belong to a group of organisms called the Protoctista. Allele: One of the different forms of a particular gene.In humans, a ge ...
... one-celled organisms that form phytoplankton as well as the seaweeds. Although algae photosynthesise and their cells are surrounded by a cell wall, they are not plants. They belong to a group of organisms called the Protoctista. Allele: One of the different forms of a particular gene.In humans, a ge ...
2.1 Living organisms 2.1.1 Useful products Scientists are looking for
... Cells are the building blocks of all almost all organisms. Plant and animal scientists study cells and the processes that go on in cells to learn more about life itself. Scientists called pathologists examine cells to look for harmful changes that can lead to diseases such as cancer. Other scientist ...
... Cells are the building blocks of all almost all organisms. Plant and animal scientists study cells and the processes that go on in cells to learn more about life itself. Scientists called pathologists examine cells to look for harmful changes that can lead to diseases such as cancer. Other scientist ...
Assignments Handbook - Independence High
... What is phenylketonuria? Phenylketonuria (commonly known as PKU) is an inherited disorder that increases the levels of a substance called phenylalanine in the blood. Phenylalanine (an amino acid) is a building block of proteins that is obtained through the diet. It is found in all proteins and in so ...
... What is phenylketonuria? Phenylketonuria (commonly known as PKU) is an inherited disorder that increases the levels of a substance called phenylalanine in the blood. Phenylalanine (an amino acid) is a building block of proteins that is obtained through the diet. It is found in all proteins and in so ...
Introduction to genetics
Genetics is the study of genes — what they are, what they do, and how they work. Genes are made up of molecules inside the nucleus of a cell that are strung together in such a way that the sequence carries information: that information determines how living organisms inherit phenotypic traits, (features) determined by the genes they received from their parents and thereby going back through the generations. For example, offspring produced by sexual reproduction usually look similar to each of their parents because they have inherited some of each of their parents' genes. Genetics identifies which features are inherited, and explains how these features pass from generation to generation. In addition to inheritance, genetics studies how genes are turned on and off to control what substances are made in a cell - gene expression; and how a cell divides - mitosis or meiosis.Some phenotypic traits can be seen, such as eye color while others can only be detected, such as blood type or intelligence. Traits determined by genes can be modified by the animal's surroundings (environment): for example, the general design of a tiger's stripes is inherited, but the specific stripe pattern is determined by the tiger's surroundings. Another example is a person's height: it is determined by both genetics and nutrition.Genes are made of DNA, which is divided into separate pieces called chromosomes. Humans have 46: 23 pairs, though this number varies between species, for example many primates have 24 pairs. Meiosis creates special cells, sperm in males and eggs in females, which only have 23 chromosomes. These two cells merge into one during the fertilization stage of sexual reproduction, creating a zygote in which a nucleic acid double helix divides, with each single helix occupying one of the daughter cells, resulting in half the normal number of genes. The zygote then divides into four daughter cells by which time genetic recombination has created a new embryo with 23 pairs of chromosomes, half from each parent. Mating and resultant mate choice result in sexual selection. In normal cell division (mitosis) is possible when the double helix separates, and a complement of each separated half is made, resulting in two identical double helices in one cell, with each occupying one of the two new daughter cells created when the cell divides.Chromosomes all contain four nucleotides, abbreviated C (cytosine), G (guanine), A (adenine), or T (thymine), which line up in a particular sequence and make a long string. There are two strings of nucleotides coiled around one another in each chromosome: a double helix. C on one string is always opposite from G on the other string; A is always opposite T. There are about 3.2 billion nucleotide pairs on all the human chromosomes: this is the human genome. The order of the nucleotides carries genetic information, whose rules are defined by the genetic code, similar to how the order of letters on a page of text carries information. Three nucleotides in a row - a triplet - carry one unit of information: a codon. The genetic code not only controls inheritance: it also controls gene expression, which occurs when a portion of the double helix is uncoiled, exposing a series of the nucleotides, which are within the interior of the DNA. This series of exposed triplets (codons) carries the information to allow machinery in the cell to ""read"" the codons on the exposed DNA, which results in the making of RNA molecules. RNA in turn makes either amino acids or microRNA, which are responsible for all of the structure and function of a living organism; i.e. they determine all the features of the cell and thus the entire individual. Closing the uncoiled segment turns off the gene. Heritability means the information in a given gene is not always exactly the same in every individual in that species, so the same gene in different individuals does not give exactly the same instructions. Each unique form of a single gene is called an allele; different forms are collectively called polymorphisms. As an example, one allele for the gene for hair color and skin cell pigmentation could instruct the body to produce black pigment, producing black hair and pigmented skin; while a different allele of the same gene in a different individual could give garbled instructions that would result in a failure to produce any pigment, giving white hair and no pigmented skin: albinism. Mutations are random changes in genes creating new alleles, which in turn produce new traits, which could help, harm, or have no new effect on the individual's likelihood of survival; thus, mutations are the basis for evolution.