Transcript Life Science Assessment Review

(101) District Assessment Review
Study Guide
Light
1) What is refraction?
 Refraction = light changes in speed & bends
2) What is reflection?
 Reflection = light hits a surface it can’t go
through & bounces back
3) How does light travel?
 Light travel = in a
straight line
4) How much of the electromagnetic
spectrum can be seen with the human eye?
 Electormagnetic spectrum = small portion
called visible light
Microscope
5) If you needed a more
detailed view of a plant
cell’s structures using
a microscope, what
would you do?

Microscope = use a
high power objective
lens
6) How could you find out if an organism is a
plant or animal cell like a sea anemone?
 Animal or plant? = look at it under a
microscope for a cell wall, chloroplasts, or a
large vacuole
Cell Biology
7) What parts do plant cells have that animal
cells don’t?

Plant cell = cell wall, chloroplasts, &
large vacuole
8) What are chloroplasts?

Chloroplast = they capture energy from the
sun
9) What is the function of the mitochondria?
 Mitochondria = makes & releases energy
10) Where is DNA found in a cell?
DNA’s found in nucleus
11) Where can you obtain DNA from in a
human cell?
Obtain DNA from chromosomes in the nucleus
12) What do chromosomes contain?
Chromosomes contain DNA
13) What characteristic do the cell’s of all living
organisms share?
All living things = contain cells that can replicate
(reproduce)
14) What is differentiation?
Differentiation = when cells specialize to become other
types of cells
15) List 1 characteristic cells can’t do.
1 characteristic cells can’t do = can’t MAKE FOOD!
Mitosis
 16) What process do cells
undergo to create 2 identical
cells?
 Cells create 2 identical cells
through Mitosis
 17) What characteristic do the
2 daughter cells made
through the cell cycle share?
 2 daughter cells have identical
genetic material (DNA) as the
parent
TRY
Genetics
2 plants with purple flowers
are crossed.
18) If most of the offspring have purple flowers,
but some of them have all white flowers.
What most likely caused these offspring to
produce white flowers?
 2 plants w/purple flowers end up w/some
offspring w/white flowers because they inherited
a recessive allele from each parent
After mating, a female cat
gave birth to 5 offspring.
19) Approximately what portion of each kitten’s
genes came from its mother?
 What portion of a kitten’s genes come from
mother = Half (1/2)
TRY
A litter of kittens may have a
variety of fur colors, even
though the kittens all have
the same parents.
20) What would explain why fur color may vary
widely in a single litter of kittens?
 Why are there many fur colors in a litter of
kittens = fur color is influenced by more than 1
gene
TRY
Cross tall stem (TT) with short
stems (tt).
21) All of the first generation offspring had tall
stems (Tt). The scientist allowed these
offspring to self-pollinate. ¾ of the new
offspring had tall stems and ¼ had short
stems. How would you represent these
results?
 Crossing TT x tt = TT, Tt, Tt, tt
TRY
Dimples are a dominant trait
(D) inherited on a single gene.
22) A man with dimples and a woman with no
dimples have 2 children with no dimples.
What combination of alleles do the father
and mother most likely have?
 Crossing D? x dd = 1 parent (Dd), 1 parent (dd)
Asexual Reproduction
 23) Asexual reproduction
 Asexual reproduction = only involves 1 parent & makes an
exact copy
 24) A new hydra grows from the cells of the parent
hydra. The new hydra then detaches from the body of
the parent. (pg. 249)
 Hydra = asexual reproduction
25) How do spider plants reproduce?
 Spider plants = make exact copies of
themselves, all of the genes come from the
larger plant (the parent)
Sexual Reproduction
 26) What is the function of
the umbilical cord during
pregnancy in mammals?
 Umbilical cord = provides
nutrients to the fetus
27) Where do genes of offspring come
from in sexually reproducing
organisms?
 Sexual reproduction = ½ of the genes come
from their mother & ½ from their father
Flowering Plants
28) Describe how the biologist could
pollinate a flower.
The biologist would take pollen from the anther and
place it on the stigma, which is found on top of the
pistil. The pollen and the anther are male parts and the
stigma and pistil are female parts. The anther makes
pollen and the stigma is sticky so pollen grains can
stick to it.
29) The plant eventually produces
fruit and seeds. what parts of the
plant grow into the fruit and seeds?
The ovary develops into
the fruit and the ovule into
the seeds.
30) As the fruit grows, its cells undergo
mitosis. Explain what mitosis is and
what results when a cell undergoes
mitosis.
Mitosis is the process where 1 cell divides into 2
daughter cells with the exact same DNA as the
parent cell.