BI 218 Exam 1 Study Guide

BI 218 Exam 1 Study Guide - Study Guide Intro to Cell and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Study Guide: Intro to Cell and Molecular Biology Exam One Chapter One 4. A bacterium weighs about 10-12 g and can divide every 20 minutes. If a single bacterial cell carried on dividing at the same rate, how long would it take before the mass of bacteria would equal that of the Earth (6x10 24 kg)? Contrast your result with the fact that bacteria originated at least 3.5 billion years ago and have been dividing ever since. Explain the apparent paradox. (The number of cells, N , in a culture at time t is described by the equation N = N x 2 t/G , where N is the number of cells at zero time and G is the population doubling time.) • 5. According to Figure 1-19, why does the mitochondrion have both an outer and an inner membrane? Which of the two mitochondrial membranes should be – in evolutionary terms – derived from the cell membrane of the ancestral eukaryotic cell? In the electron micrograph of a mitochondrion in Figure 1-18A, identify the space that contains the mitochondrial DNA, ie, the space that corresponds to the cytosol of the bacterium that was internalized by the ancestral eukaryotic cell shown in Figure 1-19 (page 19). • 8. Your next door neighbor has donated $100 in support of cancer research and is horrified to learn that her money is being spent on studying brewer’s yeast. How could you put her mind at ease? • Cancer, by definition, is the uncontrollable division of abnormal cells. Brewer’s yeast is considered a good model organism for understanding the cell-division cycle. Therefore, cancer research may be conducted using brewer’s yeast as a model organism in order to understand cancer and the way the disease begins and divides throughout the body. I would tell my neighbor that research, like anything else, begins with small steps. Beginning research may include studies on brewer’s yeast and cell division. Later, the conclusions from that research may be applied to more advanced studies on mammals or human cells. The findings from any research, no matter how irrelevant it may seem, furthers scientific knowledge of cancer and may bring the scientific community that much closer to finding a treatment or cure for cancer. Hopefully that would put my neighbor’s mind at ease! 9. Briefly define what the following cellular components are and what function they provide for the cells • Cytosol: contents of the main compartment of the cytoplasm, excluding membrane-enclosed organelles such as the endoplasmic reticulum and mitochondria • Cytoplasm: contents of a cell that are contained within its plasma membrane, but in the case of eukaryotic cells, outside the nucleus • Mitochondria: membrane-enclosed organelle, about the size of a bacterium, that carries out oxidative phosphorylation and produces most of the ATP in eukaryotic cells • Nucleus: the major organelle of an eukaryotic cell, which contains DNA organized into chromosomes....
View Full Document

This note was uploaded on 02/12/2012 for the course BI 218 taught by Professor Belton during the Fall '11 term at Northern Michigan University.

Page1 / 10

BI 218 Exam 1 Study Guide - Study Guide Intro to Cell and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online