Bio
Which sequence correctly lists the different levels of organization, from smallest to largest
Cells..tissues..organs..organ system..organism
Cells..organs..tissues..organ system..organism
Tissues..cells..organ system..organs..organism
Tissues..organs..organ system..organism..cells
The body temperature in humans is maintained around 37C. Which characteristic of life does this information represent?
Living things are homeostatic
Living things acquire materials and energy from the envirnment
Living things adapt
Living things respond to stimuli
A localized group of organisms that belong to the same species is called a
Population
Community
Ecosystem
Biosystem
All organisms of various species living within a given area are a/n
Community
Ecosystem
Population
Biosphere
When comparing energy and chemicals in an ecosystem
Chemicals cycle over and over again, but energy flows through once
Both chemicals and energy cycle over and over
Both chemicals and energy flow through once
Energy cycles over and over again but chemicals flow through once
You observe a specimen that is multi cellular, exhibits external digestion, and whose cells have walls containing chitin. You would classify this organism in the kingdom
Fungi
Plantae
Protista
Animalia
A medical student is designing an experiment to test the results of a new drug that she hypothesizes will greatly reduce or possibly eliminate the side effects of a new cancer treatment. If the experiment is to be set up correctly, she will divide the patients in two groups and
Give one group the new drug and the other group a placebo that looks identical to the actual drug
Give one group the new drug and the other group half the normal dose
Give one group the new drug and the other group nothing
Give each group the same amount of the new drug
Once labor begins in childbirth, contractions increase in intensity and frequency until delivery. The increasing labor contraction of childbirth are an example of which type of regulation?
Positive feedback
Negative feedback
Feedback inhibition
Enzymatic catalysis
A cation has
More protons than electrons
More electrons than protons
More protons than neutrons
More neutrons than protons
Calcium has an atomic number of 20 and an atomic mass of 40. Therefore, an uncharged calcium atom must have
20 protons
40 electrons
40 neutrons
Both 20 protons and 40 electrons
Oxygen has 6 electrons in its outer energy shell;therefore
It can form one double covalent bond or two single covalent bonds
It has completely filled outer shell
It does not react with any other atom
It has a positive charge
Valance electrons
Are the one involved in chemical reactions
Are the ones closest to the nucleus
Contain the least amount of energy
All of the above
A covalent bond is
The transfer of electrons from one atom to another
A sharing of electrons between two atoms
An attraction of charged atoms
A sharing of protons between two atoms
Which of the following statements about hydrogen bonds is incorrect
Hydrogen bonds are easily broken
Hydrogen bonding can occur between different molecules
Most hydrogen bonds involve hydrogen and oxygen or nitrogen
Hydrogen bonding occurs only between water molecules
What property of water explains the attraction of water to other charged molecules
Adhesion
Cohesion
Evaporative cooling
Water is the universal solvent
Based on the polarity of water molecules, the solute molecule depicted here is most likely
Positively charged
Negatively charged
Without charge
Nonpolar
A can of cola consists mostly of sugar dissolved in water, with some carbon dioxide gas that makes it fizzy and makes the pHless thn 7. In chemical terms, the cola is an aqueous solution where water is the________, sugar is a_________, and carbon dioxide makes the solution___________
Solvent...solute...basic
Solvent...solute...acidic
Solvent...solvent...basic
Solvent...solvent...acidic
A buffer will
Add OH- from a solution that is too basic
Add H+ when a solution is too acidic
Remove H+ when the pH is too low
Remove water molecules when the pH is too low
A solution with a pH of 5 has how many more protons in it than a solution with a pH of 7
5 times
10 times
100 times
1000 times
A single carbon atom can form__________covalant bonds
2
3
4
None; carbon only participate in ionic bonds
Two glucose molecules can combine to form a disaccharide molecule and
Another glucose molecule
A lipid
A water molecule
A dipeptide molecule
Which statement is true regarding fats
A saturated fat is liquid at room temperature
A saturated fat is more common in plants; unsaturated fat is more common in animals
An unsaturated fat contains double bonds
An unsaturated fat has 2 fatty acid chains; a saturated fat has 3 fatty acid chains
Why are hydrocarbons insoluble in water
They are hydrophilic
They are lighter than water
They exhibit considerable molecular complexity
The majority of the bonds are nonpolar covalent bonds
The molecule formula for a molecule made by linking together three 6-carbon monosaccharides would be
C18h36o18
C18h32o16
C18h10o15
C18h36o16
The interaction between different polypeptides is referred to as a protein's _________structure
Tertiary
Quaternary
Primary
Secondary
A strand of DNA has the sequence AACGCAC what is the sequence of the second strand
AACGCAC
TTGCGTG
CACGGCAA
UUGCGUG
Which statement is false regarding electron microscopes
They have greater resolution than light microscopes
They have greater magnification than light microscopes
They use a beam of electrons as its illumination source
They can be used to view live specimens
In order to veiw the outer surface of cilia, you should use a
Scanning electron microscope
Transmission electron microscope
Light microscope
Naked eye
What is the main advantage of small cell size
Small cells are less likely to burst
Small cells require more oxygen
Small cells have larger plasma membrane surface area: cell volume ratio
It takes less energy to make an organism out of small cells
What is the purpose of fimbriae on a prokarotic cell
Aid with attachment to surface
Locomotion/movement
Ingestion of food
Reproduction
When a vacule fuses with a lysosome
They both dissapear
Protein synthesis begins
Division begins
Its contents are digested
Which organelle is primarily involved with the synthesis of oils and phospolipids
Smooth er
Lysosomes
Golgi apparatus
Mitochondria
If an active cell produces an important protein for selection what would be the correct sequence order
Endoplasmic reticulum to ribosomes to golgi apparatus
Ribosomes to endoplasmic reticulum to golgi apparatus
Golgi apparatus to endoplasmic reticulum to ribosomes
Ribosomes to golgi apparatus to endoplasmic reticulum
The _____________ will store pigments and toxins in plant cells
Chloroplasts
Central vacule
Contractile vacule
Peroxisomes
Which components of the cytoskeleton does not change shape?
Microtubules
Microfilaments
Intermediate filaments
All of the above
________________ is the communicating junction in animal cells
Anchoring junctions
Gap junctions
Plasmodesmata
Tight junctions
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