SC160 Lesson 2 Exam SCORE 100 PERCENT

Question 1        5 / 5 points
A balloon permeable to water but not to glucose contains a 10% glucose solution. A beaker contains a 5% glucose solution. Which of the following is true?
Question options:

The solution in the beaker is hypertonic relative to the solution in the balloon.

The solution in the balloon is isotonic; the solution in the beaker is hypertonic.

When placed in the beaker, the balloon will lose water by osmosis.

The solution in the balloon is hypertonic relative to the solution in the beaker.
Question 2        5 / 5 points
Relaying a message from a receptor protein to a molecule that performs a specific function within a cell is called:
Question options:

signal transduction.

inhibition.

self-recognition.

selective permeability.
Question 3        5 / 5 points
Microtubules are associated with:
Question options:

cilia.

flagella.

cell shape.

All of the above
Question 4        5 / 5 points
Usually, enzymes are:
Question options:

fats.

steroids.

chemical reactions.

proteins.
Question 5        5 / 5 points
Which of the following processes could result in the net movement of a substance into a cell, if the substance is more concentrated in the cell than in the surroundings?
Question options:

Active transport

Facilitated diffusion

Diffusion

Osmosis
Question 6        5 / 5 points
Substances that plug up an enzyme's active site are:
Question options:

enzyme substrates.

enzyme inhibitors.

induced fit factors.

enzyme products.
Question 7        5 / 5 points
Functions of the smooth endoplasmic reticulum include:
Question options:

steroid synthesis, protein synthesis, and drug detoxification.

lipid synthesis, protein synthesis, and drug detoxification.

lipid synthesis, steroid synthesis, and drug detoxification.

lipid synthesis, steroid synthesis, and protein synthesis.
Question 8        5 / 5 points
If placed in tap water, an animal cell will undergo lysis, whereas a plant cell will not. What accounts for this difference?
Question options:

Expulsion of water by the plant cell's central vacuole

The relative impermeability of the plant cell membrane to water

The relative impermeability of the plant cell wall to water

The relative inelasticity and strength of the plant cell wall
Question 9        5 / 5 points
The endomembrane system includes:
Question options:

ribosomes, lysosomes, vacuoles, and the endoplasmic reticulum.

Golgi apparatus, ribosomes, vacuoles, and the endoplasmic reticulum.

Golgi apparatus, lysosomes, ribosomes, and the endoplasmic reticulum.

Golgi apparatus, lysosomes, vacuoles, and the endoplasmic reticulum.
Question 10        5 / 5 points
Tobacco smokers (and those exposed to tobacco smoke) are at greater risk of an ectopic (tubal) pregnancy. Based on your understanding of the structures of the cytoskeleton, what is the best explanation?
Question options:

Tobacco smokers tend to get pregnant when they are younger.

Tobacco interferes with the functioning of the flagella propelling sperm.

Tobacco interferes with the transfer of oxygen to the uterus, thereby forcing the zygote to implant in a fallopian tube.

Tobacco interferes with the sweeping motion of cilia that aids in the movement of the egg toward the uterus.
Question 11        5 / 5 points
In eukaryotic cells, what name is given to the region between the nucleus and the plasma membrane?
Question options:

Cytoplasm

Phospholipid bilayer

Nucleoid

Chloroplast
Question 12        5 / 5 points
Osmosis can be defined as:
Question options:

the diffusion of water.

the diffusion of nonpolar molecules.

active transport.

the diffusion of a solute.
Question 13        5 / 5 points
Which theory states that all living things are composed of cells?
Question options:

Cell theory

Hooke's rule

Evolutionary theory

Mendel's law
Question 14        5 / 5 points
Ten kilocalories are equivalent to __________ calories.
Question options:

1,000

10,000

0.1

100
Question 15        5 / 5 points
A rock on the top of a mountain contains __________ energy.
Question options:

potential

no

kinetic

conserved
Question 16        5 / 5 points
Information is transferred from the nucleus to ribosomes via:
Question options:

Mrna.

rough endoplasmic reticulum.

DNA.

smooth endoplasmic reticulum.
Question 17        5 / 5 points
In plant cells, __________ may contain organic nutrients, pigments, and poisons.
Question options:

mitochondria

chloroplasts

lysosomes

central vacuoles
Question 18        5 / 5 points
The region of an enzyme to which a substrate binds is called the __________ site.
Question options:

active

substrate

enzymatic

conformational
Question 19        5 / 5 points
Which organelle is responsible for photosynthesis?
Question options:

Smooth endoplasmic reticulum

Mitochondrion

Ribosome

Chloroplast
Question 20        5 / 5 points
Diffusion is an example of:
Question options:

phagocytosis.

active transport.

endocytosis.

passive transport.

SC160 Lesson 1 Exam SCORE 90 PERCENT

Lesson 1 Exam
Question 1        5 / 5 points
1. Which of these would be a valid hypothesis?
Question options:

Human history is determined by a series of supernatural events.

Humans should help in the conservation of other animal species.

Humans are controlled by forces beyond our understanding.

Humans and bacteria share a common genetic code.
Question 2        5 / 5 points
2. The following molecule is best described as a: CH3—CH2—CH2—CH2
Question options:

protein.

carbohydrate.

hydrocarbon.

lipid.
Question 3        5 / 5 points
3. Carbohydrates typically include:
Question options:

<p> an NH₂ group.</p>

C, H, and O atoms.

nucleotides.

<p> a PO₄ group.</p>
Question 4        5 / 5 points
4. Taxonomy is the:
Question options:

study of cells.

naming and classifying of organisms.

study of organisms and their interaction with the environment.

study of genes.
Question 5        5 / 5 points
5. 66An atom with an electrical charge is a(n):
Question options:

isotope.

molecule.

ion.

compound.
Question 6        5 / 5 points
6. __________ is an example of an element.
Question options:

Water

Carbon

Glucose

Salt
Question 7        5 / 5 points
7. A fat that is hydrogenated is:
Question options:

more unsaturated.

easier to digest.

more solid.

less likely to cause strokes.
Question 8        5 / 5 points
8.  Sometimes when I have my morning coffee, which I drink black with no sugar, I notice a thin film floating on top of the coffee. Since I have just read Chapter 3 of the text, I now realize the nature of this substance and so I run to my friend screaming, "Look at this __________ in my coffee!"
Question options:

hydrophilic substance

hydrophobic substance

glucose

nucleotide
Question 9        5 / 5 points
9.How many oxygen atoms are in the products of the following reaction?

C6H12O6 + 6 H2O + 6 O2 → 6 CO2 + 12 H2O
Question options:

18

6

12

24
Question 10        5 / 5 points
10.  In what way(s) is the science of biology influencing and changing our culture?
Question options:

By helping us understand the relevance of evolution to human health

By revealing how mutations in genes can lead to disease

By providing new tools for forensic investigations

All of the above
Question 11        5 / 5 points
11. Science is:
Question options:

the inquiry-based effort to describe and explain nature.

the search for truth.

an organized set of principles for how to ethically and morally behave.

All of the above
Question 12        5 / 5 points
12. People with lactose intolerance do not have enough:
Question options:

galactose.

lactase.

glucose.

fructose.
Question 13        5 / 5 points
13. In the following reaction, what type of bond is holding the two atoms together?

K + Cl → K+ + Cl- → KCl
Question options:

Hydrophilic

Ionic

Hydrophobic

Covalent
Question 14        0 / 5 points
14.  Which of these is required for natural selection to occur?
Question options:

Inheritance

Unequal reproductive success

Individual variation

All of the above (Incorrect)
Question 15        5 / 5 points
`15.  Humans are composed of __________ cells.
Question options:

bacterial

eukaryotic

plant

prokaryotic
Question 16        0 / 5 points
16.  The model on the left is not realistic in that:
 
Question options:

neutrons are not located in the nucleus.

the electrons should be much farther away from the nucleus.

electrons do not orbit the nucleus in a ring shape. (Incorrect)

electrons do not have a negative charge.
Question 17        5 / 5 points
17.  Beryllium's atomic mass is 9 and its atomic number is 4. How many neutrons are found in a beryllium atom?
Question options:

9

13

4

5
Question 18        5 / 5 points
18.  Which of the following is water hydrophilic?
Question options:

Cellulose

Testosterone

Butter

Cholesterol
Question 19        5 / 5 points
19.  A base:
Question options:

removes H₂O molecules from a solution.<br/>

decreases the pH of a solution.

removes OH^— ions from a solution.&nbsp;

removes H⁺ ions from a solution.&nbsp;
Question 20        5 / 5 points
20.  Which of the following is a health effect of a diet high in saturated fats?
Question options:

Increased blood flow

Decreased risk of atherosclerosis

Increased risk of heart attack

Decreased risk of stroke

SC160 Assignment --03 --Revised

ASSIGNMENT 03

SC160 Basic Biology

Directions:  Be sure to save an electronic copy of your answer before submitting it to Ashworth College for grading. Unless otherwise stated, answer in complete sentences, and be sure to use correct English, spelling and grammar. Sources must be cited in APA format. Your response should be four (4) double-spaced pages; refer to the "Assignment Format" page located on the Course Home page for specific format requirements.

 

Integrate by discussion the properties of life, basic chemical terminology, and molecules and compounds of a cell necessary for life. Include the basic anatomy and physiology of a cell and describe how cell respiration, photosynthesis, and cell reproduction occur in a succinct manner. Include a brief discussion about Mendel's Laws and an overview of DNA structure and function. Conclude with a discussion of cancer and the mechanisms of gene control.

SC140 Online Exam 4

Question 1 (5 points)
 
In contrast to going without food, the human body can survive only about __________ days without water.
Question 1 options:

3

7

11

15
Question 2 (5 points)
 
Which of the following sources of water is most likely to contain contaminants?
Question 2 options:

Aquifers

Distilled water

Surface water

Groundwater
Question 3 (5 points)
 
All of the following describe benefits of water acting as a solvent, EXCEPT:
Question 3 options:

rainwater carries air pollutants to earth from the atmosphere.

water helps maintain a chemical balance in our bodies by carrying wastes away.

water in blood plasma transports nutrients to all our ograns.

rainwater dissolves and carries pesticides and fertilizers from farmland to streams and lakes.
Question 4 (5 points)
 
Given that 1 ppb = 1 microgram/L and that the federal government's maximum allowable concentration of lead in drinking water is 15 ppb, how many micrograms of lead in 2L of water would meet this standard?
Question 4 options:

15

30

45

60
Question 5 (5 points)
 
How many grams of NACL would you add to 500 mL of water to create a 1.75M solution of NACL? (1M of NACL = 58.5 g)?
Question 5 options:

102.38 g

58.50 g

51.19 g

43.88 g
Question 6 (5 points)
 
Many of the unique properties of water are a consequence of the overall shape of its molecules as well as the:
Question 6 options:

polarity of its bonds within each molecule.

small EN difference between oxygen and hydrogen atoms.

equal sharing of electrons between oxygen and hydrogen atoms.

absence of any hydrogen bonds.
Question 7 (5 points)
 
Ionic compounds are formed when:
Question 7 options:

elements from the same side of the periodic table exchange electrons.

metallic elements and nonmetallic elements exchange electrons.

the sum of the negative charges in both elements is greater than the sum of positive charges.

polyatomic ions are eliminated from the combination.
Question 8 (5 points)
 
All of the following ionic compounds are soluble in water, EXCEPT:
Question 8 options:

ammonium nitrate.

sodium sulfate.

aluminum hydroxide.

calcium carbonate.
Question 9 (5 points)
 
Which of the following best summarizes the solubility rule about the relationship between molecular structure and the formation of chemical compounds?
Question 9 options:

Like dissolves like.

Electricity and water don't mix.

Elements on the same side of the periodic table exchange electrons.

Solvents move through membranes from higher solvent concentrations to lower.
Question 10 (5 points)
 
The EPA has established a legal limit or __________ for the concentration of nitrates, benzene, and other contaminants to our nation's drinking water.
Question 10 options:

maximum contaminant level goal (MCLG)

maximum contaminant level (MCL)

municipal sanitary standard (MSS)

national toxicity requirement (NTR)
Question 11 (5 points)
 
"Hard water" contains high concentrations of dissolved __________ ions.
Question 11 options:

cadmium and chromium

nitrate and lead

calcium and magnesium

sodium and chloride
Question 12 (5 points)
 
Due to its prevalence in the environment and the severe and permanent neurological problems it causes, __________ is considered the most dangerous water contaminant.
Question 12 options:

Chromium

Mercury

Cadmium

Lead
Question 13 (5 points)
 
The oxides of sulfur and nitrogen are referred to as acids even though they contain no hydrogen ions because they:
Question 13 options:

lose electrons after being combusted in car engines.

attract hydrogen atoms from methane gas found in the atmosphere.

produce hydrogen ions once they dissolve in water.

interact with ozone to produce acid anhydrides.
Question 14 (5 points)
 
__________ includes wet forms such as rain, snow, fog, and cloud-like suspensions of microscopic water droplets often more acidic than acid rain.
Question 14 options:

Hydrogen deposition

Acid deposition

pH deposition

Aqueous deposition
Question 15 (5 points)
 
Even though there is relatively little sulfur dioxide in the smoggy air above Los Angeles, it still has quite acidic rain because:
Question 15 options:

sulfur dioxide drifts down from Mt. St. Helen.

car engines are hot enough to create nitrogen monoxide from internal combustion.

its proximity to the Pacific Ocean allows the aqueous sulfur ions to be sucked into the atmosphere.

there are a number of coal-burning power plants in the city to introduce sulfur into the atmosphere.
Question 16 (5 points)
 
A New York glass manufacturer was able to reduce NO emissions by 90% and energy consumption by 50% simply by:
Question 16 options:

switching from air to oxygen in its large furnaces.

using electric power rather than propane in heating the glass.

reducing the burning of high-sulfur coal in its furnaces.

using silicon with a lower melting point to make glass.
Question 17 (5 points)
 
__________ involves a chemical reaction of bacteria among certain plants that removes nitrogen from the air and converts it to ammonia.
Question 17 options:

Denitrification

Neutralization

Biological nitrogen fixation

Nitrogen saturation
Question 18 (5 points)
 
The __________ clause in the Clean Air Act was aimed at requiring utility companies to implement air quality control meansures in older dirty plants once they were "substantially modified."
Question 18 options:

New Source Review

Cap and Trade

Clear Skies Initiative

National Acid Precipitation
Question 19 (5 points)
 
Milk of Magnesia is said to have a pH of 10 which is considered to be:
Question 19 options:

acidic.

basic.

neutral.

slightly acidic.
Question 20 (5 points)
 
The __________ ion originally became incorporated from seawater into ancient rocks such as coal, and when the coal is burned, it releases compounds that become acidic in the atmosphere.
Question 20 options:

sulfur

mercury

zinc

calcium

SC140 Assignment--3_06

ASSIGNMENT 03

SC140 Elements of Chemistry

Directions:  Be sure to make an electronic copy of your answer before submitting it to Ashworth College for grading.  Unless otherwise stated, answer in complete sentences, and be sure to use correct English spelling and grammar.  Sources must be cited in APA format.  Your response should be a minimum of one (1) single-spaced page to a maximum of two (2) pages in length; refer to the "Assignment Format" page for specific format requirements.

 

This project offers a hands‑on approach to understanding the acidity of a solution and basic compounds in relation to pH.  You may review this topic by reviewing Chapter 6 in Chemistry in Context.  By completing this project, you will increase your knowledge of the properties of an acid or base and explain how acid‑base reactions are important in environmental chemistry.

 

Acids are classified as strong or weak by their ionization behavior in water.  Basic compounds are referred to as alkaline substances and the watery solutions exhibit a slippery feel.  The addition of acids or bases is often quantified in terms of pH and different levels of pH are found within common foods and chemicals in our households.

 

After successfully completing this project you will be able to:

·         Identify acids and bases in your household,

·         Identify an acid-base reaction and its application.

 

Instructions for the Experiment  

Part I

For Part I of this project, you will need to purchase a package of litmus paper.  You may find this at shops specializing in school supplies, gardening or health foods.  The cost should be minimal.  If you are really adventurous – and the season is right – you can make your own litmus paper by crushing blackberries until they are liquid, pouring the liquid onto construction paper and allowing it to dry.

1.      Use your litmus paper, which turns red in acidic solution and blue in basic solution, to determine the acidity of at least 3 various foods, liquids and moist surfaces around your home. 

2.      Test the pH of your tap water. 

3.      Obtain soil from a nearby garden or lawn, shake it with a small amount of water, let it settle and then test the acidity of the water above the solids. 

4.      Make notes regarding each of your findings.

Part II

1.      Dissolve some baking soda in a large glass of warm water.

2.      Add a couple drops of liquid dish soap and stir. 

3.      Pour vinegar into this solution. 

4.      Make notes describing the chemical reaction involved.

 

SC140 Assignment1

ASSIGNMENT 01

SC140 Elements of Chemistry

 

There are ways to reduce human-caused pollution.  What we choose to eat, drive, and use in our daily lives can limit our negative effects on the environment.  This assignment is designed to study human behaviors that contribute to pollution levels. 

                    

After successfully completing this assignment you will be able to:

·         Analyze your personal contribution to air pollution,

·         Discuss ways that an individual can minimize environmental pollution. 

 

Instructions:  Keep a detailed diary for three days, identifying how each of your activities contributes to air pollution.  Afterwards, analyze what you could have done to avoid or minimize your adverse environmental impact.  Write a paper outlining your diary and summarizing your results; you must analyze at least six (6) actions in your paper.

PS350 Assignment 08

Instructions

Directions: Be sure to save an electronic copy of your answer before submitting it to Ashworth College for grading. Unless otherwise stated, answer in complete sentences, and be sure to use correct English, spelling, and grammar. Sources must be cited in APA format. Your response should be four (4) double‐spaced pages; refer to the "Format Requirementsʺ page for specific format requirements. Part A: Sleep Stages Your textbook describes the different stages of sleep. Write the following: Describe slow-wave sleep and REM sleep. Be sure to include the brain activity that takes place during these two stages what an EEG recording looks like during each of these two stages Part B: Types of Learning There are four basic forms of learning: perceptual learning stimulus-response learning motor learning relational learning Write the following: Describe two of these types of learning. Provide at least two (2) examples for each of these of a situation in which each of these types of learning occurs, being sure to cite your sources. Part C: Generalized Anxiety Disorder: Definition, Cause & Treatment One of your family members has been experiencing symptoms similar to generalized anxiety disorder (GAD). The family member has asked you for help with finding treatment. You decide you want to research the disorder before you offer your help. Write the following: Give the definition of GAD and (2) causes and (2) treatment options for GAD.