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BIO 161 Exam 1 Questions And Answers With Verified Solutions Already Passed (GRADED A+)
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BIO 161 Exam 1 Questions And Answers With Verified Solutions Already Passed (GRADED A+)
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BIO 161 Exam 1 Questions And AnswersWith Verified Solutions Already Passed
(GRADED A+)
4 levels of life - ANSWER✔✔ cell, tissue, organ, organ system
7 characteristics of life - ANSWER✔✔ 1. organized (composed of cells)
2. acquire materials and energy (capacity to do work and metabolize)
3. homeostatic
4. reproduce
5. potential for growth
6. have evolutionary history/heredity of traits (adapt and evolve)
7. respond to stimuli (internal or external and leads to response)
Why do humans belong to the domain Eukarya and kingdom Animalia? -
ANSWER✔✔ Eukarya: because we have nuclei, organelles, a cell membrane, and
an endoplasmic reticulum in our cells
Animalia: because we digest and process food
What is an element? - ANSWER✔✔ basic building blocks of matter; cannot be
broken down any further
What are the 4 major elements that make up the human body? - ANSWER✔✔
carbon, nitrogen, oxygen, hydrogen
What are the 3 most important subatomic particles that make up an atom? Where
are they located in the atom? - ANSWER✔✔ protons and neutrons in nucleus,
electrons in shells
atomic number - ANSWER✔✔ the number of protons in the nucleus of an atom
atomic mass - ANSWER✔✔ Number of protons and neutrons
Radioisotopes - ANSWER✔✔ An isotope that has an unstable nucleus and
undergoes radioactive decay; emits energy called radiation
, Why are radioisotopes important? - ANSWER✔✔ the radiation can damage cells
and cause cancer. It can be used for imaging in the body, killing bacteria in food,
killing cancer cells, and sterilizing equipment
why is h2o a compound but o2 is not? - ANSWER✔✔ compounds are molecules
made of DIFFERENT atoms
ionic bonds - ANSWER✔✔ Formed when one or more electrons are transferred
from one atom to another; ions carry a charge; weaker bond
covalent bonds - ANSWER✔✔ atoms share electrons to fill valence shells; can be
double or triple; stronger type
covalent and ionic bonds - ANSWER✔✔ both have goal to achieve stable outer
shell
How is a water molecule formed? - ANSWER✔✔ covalent bonding of 2 hydrogen
atoms to 1 oxygen atom
What are hydrogen bonds? - ANSWER✔✔ a weak bond between two molecules
resulting from an electrostatic attraction between a proton in one molecule and an
electronegative atom in the other; weakest bond
What are the special properties of water and why are they important to us? -
ANSWER✔✔ 1. liquid at room temp
2. high heat capacity
3. high heat of evaporation
4. frozen it is less dense than liquid
5. it is a solvent
6. it is cohesive and adhesive
Why does water cause polar (charged) molecules like the salt NaCl (sodium
chloride) to dissociate? Explain how this occurs. - ANSWER✔✔ water is a solvent
because polar molecules are hydrophilic, so they attract water and separate. When
you place an ionic substance in water, the water molecules attract the positive and
negative ions from the crystal.
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