Introduction A chromosome is a minuscule threadlike part of the nucleus and a structured DNA in the form of genes carrying hereditary information (Bridges‚ 1938). Endomitosis is the process of mitosis of chromosomes without undergoing nuclear or cellular division to increase cell volume. This results in a single nucleus having many copies of a single chromosome (Painter & Reindorp‚ 1940). In this experiment‚ Drosophila melanogaster is reared in specific conditions and its salivary gland extracted
Premium DNA Chromosome Gene
The starting material for this lab was the dialyzed sample (stored at -20ᵒ C) from the previous lab. The CM sephadex resin (taken in a 50 mL tube) was already made swollen using Buffer C (20 mM HEPES‚ pH 7.9; 1 mM EDTA; 50 mM KCl). The dialyzed sample was thawed to the room temperature and gently poured over the resin. The tube was capped and kept on a rocker at room temperature for 1 hour. The tube was then centrifuged in a HS-4 rotor at 2500 rpm (1200g) for 5 minutes at 4ᵒ C. Supernatant was discarded
Premium Laboratory glassware Laboratory equipment Chemistry
Based off the results from this lab the student was able to determine and have an overall better understanding of the variables that affect the rate of photosynthesis in a plant. The first variable the student tested in the lab was 30cm of light with CO2 present. The student started this trial with all 10-leaf disks and timed how many leaf disks came up every minute for 15 minutes. One minute into the trial and the student recorded that no leaf disks had yet to rise to the top of the solution. At
Premium Photosynthesis Plant Carbon dioxide
Introduction The purpose of this lab is to determine which pigments in a plant support or effect photosynthesis‚ based on starch production‚ which wavelengths of light are involved in photosynthesis‚ and identify plant pigments found in a plant leaf by means of paper chromatography. Life on Earth is dependent entirely on the energy from the Sun‚ not only to keep the planet at a suitable temperature but also to provide the energy required to sustain life. The energy of the Sun‚ in the form of
Premium Photosynthesis Chlorophyll
BIOLOGY DCN PHOTOSYNTHESIS LAB # 6 Effect of varying coloured filters on the photosynthetic rate of spinach chloroplasts The data below is just representative of what trends and relationships you were supposed to see. Numbers can vary. Absorbance at 620 nm for each treatment DCPIP + chloroplasts t=0 min. 0.93 0.945 0.905 0.915 t=3 min. 0.95 0.731 0.83 0.816 change in A620 -0.02 0.214 0.075 0.099 t=0 min. t=3 min. change in A620 t=0 min. t=3 min. change
Premium Photosynthesis Light Chlorophyll
water on the rate of photosynthesis. Aim: The aim is to investigate how increasing carbonate in water can affect the rate of photosynthesis. Introduction: The rate of photosynthesis can be increased or decreased in many different ways. For example‚ by adding substances like alkaline or salt to the water‚ you can increase or decrease the acidity or basics‚ if the water has too much acidity‚ it can often delay the rate of photosynthesis‚ often stopping the rate of photosynthesis in the plant‚ which
Premium
cytoplasmic streaming‚ and plasmolysis of Egeria densa. First‚ the microscope was examined and investigated to master the use of the equipment. A microscope slide grid which was on the slide glass was required to be seen clearly using 4x‚ 10x and 30x. During the latter part of the experiment‚ the Egeria densa was observed using the microscope to understand the use of microscope by actually examining Egeria densa. The different types of cells of Egeria densa that were required to observe were the general
Premium Bacteria Escherichia coli DNA
Title: Rate of Photosynthesis Introduction: Photosynthesis occurs in plants where the light energy changes to chemical energy. This process occurs in the chloroplast of the plant cell in order to have gas exchange in the organism. Purpose: To measure the effect of light intensity on the rate of photosynthesis in the leaf cells. Hypothesis: The higher the concentration of the sodium bicarbonate solution‚ the faster the leaf of the plant will rise to the surface of the water in the beaker‚ the
Premium Sodium bicarbonate Photosynthesis Chemistry
_______(savanna chatham)_________________ Virtual Lab #5- “Which Colors of the Light Spectrum are Most Important for Plant Growth? Instructions: Open the link to Launch “Virtual Lab #6- Photosynthesis” Read all instructions on the left-hand side of the lab. Watch the short Video at the bottom of the lab Complete the “Pre-Lab” Questions. Complete the Lab Activity Record your findings in the “Results” and “Post-Lab” sections and answer all review questions Pre-Lab: 1.) List all of the colors found in the visible
Premium Color Red White
effect of varying the distance (cm) of the Elodea plant from the light source at (5‚ 15‚ 25‚ 35 and 45 (cm)) (±0.05) on the photosynthetic rate by counting the number of oxygen bubbles rising up the test tube per minute (bubbles min^(-1)). The hypothesis was supported because as the light intensity increased‚ the rate at which oxygen bubbles rising to the top of the test tube also increased – for example‚ at the closest distance of 5 cm‚ the rate of photosynthesis was at its highest‚ with the optimum
Premium Photosynthesis Light Plant