BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
3rd Edition
ISBN: 9781260670929
Author: Hoefnagels
Publisher: MCG CUSTOM
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Chapter 1, Problem 7MCQ
Summary Introduction

Introduction:

An experiment is the main base for scientists to check the many theorem or hypotheses. Scientists do some test to find out how nature works and also, they design an experiment to check for cause and effect relationships to that particular experiment. The following things are very important to design an experiment namely sample size, variables, controls, and statistical analysis.

Here, variables are considered as the things that are “changing in an experiment”. A variable is any condition or factor that can happen in differing whole effect or form. Normally, an experiment consists of many types of variables such as standardized variable, independent variable, dependent variable, and control variable.

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A. From the experiment, what are the approximate optimal temperatures of organisms A-D? Please report temperature ranges wherever applicable. Classify these organisms based on their temperature requirements.  B. While doing this experiment, your friend dropped a tube of organism B on herself by accident.  Although the spill was cleaned, she is worried about catching an infection.  What would your advice to her be based on the data that you have generated in the experiment?C. Three out of four organisms did not grown on the plates incubated at 680C.  What is the likely molecular explanation for this?  Hint: What cellular structures are affected at this temperature?
A bacterial culture is initially composed of 100 cells. After 1 hour the number of bacteria is 1.5 times the initial population. a. If the rate of growth is proportional to the number of bacteria present, determine the time necessary for the number of bacteria to triple. b. What is the time required for a culture with 1x106 of the same bacteria to triple? Explain your results. c. Under what conditions would the answers obtained in (b) be invalid?
For an estimation of microbial population experiment, you obtained the following results: A. 1000X dilution with 0.1 mL sample volume - 470 colonies B. 10000X dilution with 0.1 mL sample volume - 250 colonies C. 100000X dilution with 0.1 mL sample volume - 100 colonies D. 1000000X dilution with 0.1 mL sample volume 12 colonies For each set of results, determine if the samples are countable plates, and for only the countable plates, calculate the CFU/mL for those plates. For plates that are not countable, please state that and do not perform the calculation (please note that calculating the CFU/mL for a plate that is not countable will be marked as incorrect).

Chapter 1 Solutions

BIOLOGY:THE ESSENTIALS (LL) W/CONNECT

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