Gen Bio Exam 1

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scientific method

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60 Terms

1

scientific method

observation, hypothesis, experiment, research, analyze, conclude

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2

characteristics of living species

reproduction, heredity, homeostasis

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3

ionic bonds

oppositely charged atoms with different electronegativities are electrostatically attracted to each other

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covalent bond

sharing of an electron pair between two atoms

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5

hydrogen bonds

hydrogen atom bonds to a strongly electronegative atom

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6

weakest to strongest atoms

hydrogen, covalent, ionic

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7

electronegativity scale

increase from left to right across the periodic table, decrease from top to bottom within a group

<p><span style="font-family: Google Sans, Roboto, Arial, sans-serif">increase from left to right across the periodic table, decrease from top to bottom within a group</span></p>
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<p></p>

hydroxyl

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term image

carboxyl

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phosphate

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amino

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methyl

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sulfhydryl

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14

polar covalent bond

covalent bond that occurs when atoms with different electronegativities share electrons unequally

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15
<p>which atom has a partial charge in a polar covalent bond</p>

which atom has a partial charge in a polar covalent bond

the atom with the lesser electronegativity

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16

polar molecules interactions with water

molecules with partial or full charges, interact with water's dipoles and dissolve in it

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nonpolar molecules interactions with water

don't interact well with water and can't form hydrogen bonds with water

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<p>general structure of an amino acid</p>

general structure of an amino acid

a central carbon atom bonded to a hydrogen atom, an amino group, a carboxyl group and an organic side chain

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19

side chains in amino acids

polar amino acids have side chains that interact with water, while nonpolar amino acids do not

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<p>polypeptide chains 3D folding near water</p>

polypeptide chains 3D folding near water

protein folding; polar amino acid side chains gather on the outside to interact with water, while nonpolar amino acid side chains form a tightly packed hydrophobic core

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21

phospholipids

they have a polar head which is hydrophilic and two non-polar tails made of fatty acids which are hydrophobic

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22

phospholipid bilayers

formed by two layers of phospholipids coming together, with the hydrophilic heads facing outward and the hydrophobic tails facing inward

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23

membrane proteins

functions include communication, cell signaling, cell division, transport, adhesion

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integral membrane proteins

located directly within the lipid bilayer, such as receptors and ion channels

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peripheral membrane proteins

not directly located in the lipid bilayer but associated with the membrane indirectly, generally by interactions with integral membrane proteins

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prokaryotic cells

absence of a nucleus, organelles, or a cytoskeleton.

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eukaryotic cells

possesses a clearly defined nucleus and membrane-bound organelles

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plasma membrane functions

protects the cell, regulates the transport of materials, provides structural support, and allows interaction with other cells through its proteins

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plasma membrane makeup

semipermeable membrane that separates the inside of a cell from its external environment, mainly made up of the phospholipid bilayer

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30
<p>structure of nucleotides</p>

structure of nucleotides

consists of a nitrogenous base, a five carbon sugar, and a phosphate group.

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31
<p>structure of DNA</p>

structure of DNA

“backbone” made of alternating sugar and phosphate groups, the inside is made up of nucleotide bases and connected by hydrogen bonds between.

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double stranded DNA molecule replication template

ensures that each dividing cell receives an identical DNA copy, each strand from the parent dictates which strand it will be on in each new daughter strand

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DNA vs RNA

DNA is double-stranded while RNA is usually single-stranded. Sugar in DNA is deoxyribose, where RNA contains ribose. DNA uses the base of thymine whereas RNA uses uracil.

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mRNA

messenger RNA; carries the protein blueprint

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tRNA

transfer RNA; carries amino acids

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rRNA

ribosomal RNA; makes up ribosomes

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RNA

ribonucleic acid; carries DNA’s genetic info to ribosomes, binds to DNA through complementary base pairing

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38

nucleus

double membrane-bound organelle that stores, retrieves, and duplicates genetic information

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mitochondrion

organelle that constantly undergoes fission and fusion; energy-associated; “powerhouse of the cell”

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40

cell wall

outermost layer of the eukaryotic cell; protects plasma membrane

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cytoskeleton

network of interlinking protein filaments, aids in cell shape, organization, and movement

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lysosome

the cell’s “garbage disposal”, breakdown of proteins

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ribosomes

present in eukaryotic cells for protein synthesis

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rough endoplasmic reticulum

covered in ribosomes on its surface, produces proteins which are folded

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smooth endoplasmic reticulum

stores lipids and steroids

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46

exon

coding sequences

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intron

noncoding sequences

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48

promoter

DNA sequence where proteins bind to initiate transcription

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transcription

the process of making an RNA copy of a gene's DNA sequence.

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translation

the sequencing of a mRNA molecule to a sequence of amino acids

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