Organelle

Write neatly and legibly. Copyright reserved Please turn over Life Sciences/P1 3 NSC DBE/Feb. – Mar. 2011 SECTION A QUESTION 1 1.1 Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A – D) next to the question number (1.1.1 – 1.1.6) in the ANSWER BOOK, for example 1.1.7 D. 1.1.1 The process in which male gametes are formed in humans is called … A B C D 1.1.2 When the first…

The rare disease known as Hutchinson-Gilford Progeria Syndrome (HGPS) is a genetic disorder that causes newborn children to age more rapidly than normal. HGPS belongs to a group of progeroid syndromes that can classified as segmental disorder that affect many tissues and organs and display symptoms that resemble physiological aging. This disorder unfortunately results in a short life span for those affected. It is reported that it occurs about 1 in 8 million births around the globe. (Arancio,…

In this experiment, a SDS-PAGE gel was used to analyze the protein samples from the MBP-AP and WT-AP experiments. The samples are then referenced to the ladder to determine the molecular weight of the MBP-AP and WT-AP proteins. Then the UV absorbance of the two proteins from 240 nm to 340 nm is determined using a nanovolume cuvette. The absorbance at 280 nm was then used in conjunction with data from previous experiments to determine the concentration of the MBP-AP and WT-AP protein samples.…

Bacteria They are formed by a single rudimentary cell. They have no nucleus or plastids, but chromatin. Some have assimilators pigments. They are on earth, water, and air, and can generally move. They may be causing disease and therefore are called pathogens. Those that do not cause disease are called saprophytes. In some cases, they are even useful, as in digestive processes or synthesis of vitamins. By the way, they are called coconuts when circular; bacilli if they have the form of rods;…

Nanoparticles (NPs) have piqued the interest of scientists because of their distinct physical, chemical and biological properties when compared to bulk material. These differences in characteristics can be attributed to the high surface-to-volume ratio (SA:V) of NPs compared to bulk material. Since NPs have a higher SA:V than bulk material, they are more reactive than their bulk counterparts; therefore, the surface characteristics of NPs can be easily manipulated. (Xuefei et al, 2014) Metal NPs…

Mackenzie Warfield Bio Lab 100 Section 2 Experiment Rough Draft Does Hydrogen Peroxide Help or Harm Seeds? Hydrogen peroxide (H2O2) is a common household item. It is made of two hydrogen atoms and two oxygen atoms. It is most commonly used in small concentrations to clean small cuts and scrapes by killing bacteria. This antiseptic kills the bacteria by tearing down their cell walls. In the last few years, hydrogen peroxide has been added to pesticides. This means that the food we consume has…

What four elements make up 96% of all living matter? _________________________________________ Concept 2.2 An element’s properties depend on the structure of its atoms 2. Below is a model of an atom of helium, correctly label the electrons, protons, neutrons, and atomic nucleus. 3. What is the atomic number of helium? _________ Its atomic mass? ________ 4. Consider this entry in the periodic table for carbon. What is the atomic mass? ______ atomic number? _______ How many…

Background Information Singapore is currently undergoing the setback of a rapidly ageing population. Invariably, the older generation aspires to age gracefully and successfully but, the truth is that only some are able to enjoy good health. Many suffer from incidents of acute exacerbation that requires hospitalization, followed by long episodes of recovery and rehabilitation for functional restoration. The geriatric care services in Singapore are wide and readily available, ensuring the…

human antibodies have been generated. Yeast is single celled eukaryotic microbes that belong to the kingdom fungi. In addition to having many structures that are similar to other eukaryotic cell, yeast also contain a number of membrane-enclosed organelles in the cytoplasm, a cytoskeleton and chromosome structures similar to human chromosomes. Yeast cells also have larger genomes than most bacteria. Moreover, mechanism of gene expression in yeast resembles those in human cells. These features…

Ebola virus disease (EVD) causes major illness in humans, which leads to death; this virus is the most lethal virus that has infected primates. The appeared originally in areas of Sudan and Zaire in the year of 1976. It is believed that the natural reservoir of the virus comes from fruit bats. Ebola is part of the Filoviridae family. The virus is mostly transmitted through direct contact with bodily fluids such as saliva and blood. Ebola can be difficult to detect in the beginning due to its…