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bio exam 1
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  • 問題数 29 • 12/14/2023

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    問題一覧

  • 1

    at the 3’ end of a typical dna strand you will find what

    hydroxyl group (-OH)

  • 2

    what do eukaryotes have that prokaryotes don’t?

    a nucleus

  • 3

    hydrolysis is a process that uses what to break something?

    water

  • 4

    DNA that is very rich in GC base pairs is harder to separate into two strands than one of the same length that is very AT rich

    true

  • 5

    covalent bonds are likely to form between two atoms if

    they can share electrons and in so doing both fill their outer shell

  • 6

    the reason water is able to form hydrogen bonds is that

    oxygen is an electronegative atom

  • 7

    what term is used to describe something that repels water

    hydrophobic

  • 8

    if a sample of DNA contains 23% thymine, what percentage of it will be cytosine

    27%

  • 9

    what is a feature common to all lipids

    they are hydrophobic

  • 10

    how big is the average protein in humans

    500 amino acids

  • 11

    to which carbon is the base attached in deoxyribose

    1’

  • 12

    if a double bond between carbon atoms is present in a molecule it means that this molecule is:

    unsaturated

  • 13

    a reason why an ion is charged could be because

    it has taken an electron from another atom

  • 14

    amino acids each have a unique biochemical property due to the

    unique collection of atoms in their R group

  • 15

    the bases on opposite strands of DNA are held together by what kind of bond

    hydrogen

  • 16

    which of these is an example of an organelle

    mitochondria

  • 17

    proteins that cross the plasma membrane must have what within them

    a region of hydrophobic amino acids

  • 18

    mitochondria and chloroplasts have their own genome and their own ribosomes inside. this is strong evidence that:

    they were once free living bacteria

  • 19

    the amino acids within proteins are held together by ____ bonds

    peptide

  • 20

    the primary structure of a protein is:

    the linear sequence of amino acids

  • 21

    amylopectin and glycogen are both storage forms of what important molecule in plants and animals?

    glucose

  • 22

    the miller urey experiment (about how life may have begun) demonstrated that:

    molecules associated with life can be made in conditions found on the early earth

  • 23

    a major difference between RNA and DNA is

    the presence of uracil, only in RNA

  • 24

    DNA is antiparallel, what does that mean?

    in each molecule the two strands are running in opposite directions

  • 25

    in which kind of molecule do you expect to find a phosphodiester bond

    DNA or RNA

  • 26

    which of these is a good description of phospholipids

    they have a hydrophilic head connected to a pair of hydrophobic tails

  • 27

    which of these is a good design a major function of a membrane

    they form a selective barrier around cells

  • 28

    how many covalent bonds can one carbon atom form with other atoms

    4

  • 29

    solution A has a pH of 3. solution B has a pH of 4. which one has a higher concentration of H+ ?

    A