Bio 111-01 Exam 2

Front 1

True or False?

The nuclear envelope is
composed of 4 lipid bilayers
pressed together as a single
membrane surrounding
the nucleus.

Back 1

False – only 2 bilayers

Front 2

Cell membranes are composed
mainly
of ___________________.

Back 2

Phospholipids

Front 3

Most cell activities
take place during which
sub-phase of interpahse?

Back 3

G1

Front 4

True or False?

Asexual reproduction
introduces variation in the
combinations
of traits among offspring.

Back 4

False – sexual reproduction does

Front 5

The cell wall that surrounds the
plasma membrane in bacteria is made of
___________________,
but in archaeans it is made of _____________.

Back 5

Peptidoglycan, proteins

Front 6

Which type of membrane protein
uses energy from ATP to
pump molecules
across a cell membrane?

Back 6

Active transport protein

Front 7

Each histone and the DNA
wrapped around it make up a _______________,
the smallest unit of structural organization in
Chromosomes.

Back 7

nucleosome

Front 8

True or False?


Meiosis can occur
in any cell in an organism’s body.

Back 8

False – it only occurs in specialized structures for sexual reproduction

Front 9

What is the dense region
in the nucleus where
subunits of ribosomes
are assembled from
proteins and RNA?

Back 9

Nucleolus

Front 10

True or False??

Gases and nonpolar molecules
diffuse freely across a
lipid bilayer.

Back 10

True

Front 11

Label the missing parts (x,y,z).

Back 11

X = chromatid, y= sister chromatid, z = centromere

Front 12

During which sub-phase of
meiosis
(phase & #)
are sister chromatids
pulled apart to opposite
ends of the cell?

Back 12

Telophase II (during meiosis II)

Front 13

Plants and animal cells both contain an
organelle that is made of 2 lipid bilayers
and has its own DNA,
although they are different organelles.
What are they?
Which belongs to which?

Back 13

Plants – chloroplasts; animals – mitochondria (although plants have mitochondria too!)

Front 14

What process causes the continual
replacement and withdraw of patches of the
plasma membrane?

Back 14

Membrane Trafficking

Front 15

During which sub-phase of mitosis
does anew nuclear envelope
form around each cluster of
newly segregated chromosomes?

Back 15

telophase

Front 16

Which sub-phase of meiosis is pictured here? (name & #)

Back 16

Metaphase I (during meiosis I)

Front 17

List the 5 components
of the endomembrane system.

Back 17

Nucleus, rough ER, smooth ER, Golgi Body, vesicles

Front 18

Why do active transport
proteins require energy to move
molecules across a membrane?

Back 18

Because they are moving against the concentration gradient!

Front 19

If a cat’s cell undergoes mitosis,
how many cells will be produced
and how many total chromosomes
will be contained in each new cell?
(n=19)

Back 19

2 cells, each with 38 total chromosomes (2n)

Front 20

What 2 processes occur during meiosis that introduce
novel combinations of alleles into gametes,
resulting in new combinations of traits
among offspring?

Back 20

Crossing over and random assortment