問題一覧
1
if a double bond between carbon atoms is present in a molecule it means that this molecule is:
unsaturated
2
what is a feature common to all lipids
they are hydrophobic
3
solution A has a pH of 3. solution B has a pH of 4. which one has a higher concentration of H+ ?
A
4
amino acids each have a unique biochemical property due to the
unique collection of atoms in their R group
5
if a sample of DNA contains 23% thymine, what percentage of it will be cytosine
27%
6
DNA is antiparallel, what does that mean?
in each molecule the two strands are running in opposite directions
7
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
8
covalent bonds are likely to form between two atoms if
they can share electrons and in so doing both fill their outer shell
9
hydrolysis is a process that uses what to break something?
water
10
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
11
proteins that cross the plasma membrane must have what within them
a region of hydrophobic amino acids
12
how many covalent bonds can one carbon atom form with other atoms
4
13
which of these is a good description of phospholipids
they have a hydrophilic head connected to a pair of hydrophobic tails
14
a reason why an ion is charged could be because
it has taken an electron from another atom
15
mitochondria and chloroplasts have their own genome and their own ribosomes inside. this is strong evidence that:
they were once free living bacteria
16
the amino acids within proteins are held together by ____ bonds
peptide
17
amylopectin and glycogen are both storage forms of what important molecule in plants and animals?
glucose
18
what term is used to describe something that repels water
hydrophobic
19
the bases on opposite strands of DNA are held together by what kind of bond
hydrogen
20
to which carbon is the base attached in deoxyribose
1’
21
in which kind of molecule do you expect to find a phosphodiester bond
DNA or RNA
22
a major difference between RNA and DNA is
the presence of uracil, only in RNA
23
the primary structure of a protein is:
the linear sequence of amino acids
24
the reason water is able to form hydrogen bonds is that
oxygen is an electronegative atom
25
how big is the average protein in humans
500 amino acids
26
what do eukaryotes have that prokaryotes don’t?
a nucleus
27
which of these is an example of an organelle
mitochondria
28
at the 3’ end of a typical dna strand you will find what
hydroxyl group (-OH)
29
which of these is a good design a major function of a membrane
they form a selective barrier around cells