8th Grade Life Science Final
- 1.A trait that helps an organism survive and reproduce is called a(n)d. variation.
- A.
Mutation.
- B.
Selection
- C.
Adaptation.
- D.
Variation. d. variation. d. variation. d. variation. d. variation. variation
- 2.The gradual change in a species over time is called
- A.
Mutation.
- B.
Evolution.
- C.
Migration
- D.
Variation.
- 3.An organism’s physical appearance is its
- A.
Genotype
- B.
Phenotype
- C.
Codominance
- D.
Bad luck...except for BSS students of course
- 4.When sex cells combine to produce offspring, each sex cell will contribute
- A.
One fourth the number of chromosomes in body cells.
- B.
Half the number of chromosomes in body cells.
- C.
The normal number of chromosomes in body cells.
- D.
As many as they can...kind of like a kid stuffing marshmellows in their mouth
- 5.A DNA molecule is shaped like a
- A.
Long, thin rod
- B.
Straight ladder
- C.
Spiral staircase
- D.
Birthday cake with 30 candles...I'LL NEVER BE THAT OLD!
- 6.The stage of cellular respiration that releases most of the energy in glucose occurs in the
- A.
Nucleus
- B.
Chloroplast
- C.
Cytoplasm
- D.
Mitochondria
- 7.If two organisms look very similar during their early stages of development, this is evidence that the organisms
- A.
Are related
- B.
Evolved from different ancestors
- C.
Had no individuality and just went with whatever was popular
- D.
Evolved from a common ancestor
- 8.Which of the following statements is part of the cell theory?
- A.
Only plants are composed of cells
- B.
All cells are produced from other cells
- C.
Cells can be produced from nonliving matter
- D.
Cells are one of several basic units of structure and function in living things
- 9.The role of the respiratory system is to bring what substance into the body?
- A.
Water
- B.
Oxygen
- C.
Carbon dioxide
- D.
Helium...the body secretly wants to sound like a chipmunk
- 10.An organism’s particular role in its habitat, or how it makes its living, is called its
- A.
Carrying capacity
- B.
Ecosystem
- C.
Competition
- D.
Niche
- 11.A mutation is harmful to an organism if it
- A.
Changes the DNA of the organism
- B.
Changes the phenotype of the organism
- C.
Reduces the organism’s chances for survival and reproduction.
- D.
Makes the organism better able to avoid predators
- 12.Mitosis is the stage of the cell cycle during which
- A.
The cell’s nucleus divides into two new nuclei
- B.
The cell’s DNA is replicated.
- C.
The cell divides into two new cells
- D.
The cell’s awkwardly smily cousin ted comes to visit
- 13.What is the function of a cell membrane?
- A.
To support the cell
- B.
To perform different functions in each cell
- C.
To control what enters and leaves the cell
- D.
To form a hard outer covering for the cell
- 14.The gradual change in species over time is called
- A.
Evolution
- B.
Taxonomy
- C.
Homeostasis
- D.
Flibadeejibbet status
- 15.The order of the bases along a gene determines the order in which
- A.
Sugars are put together to form a carbohydrate
- B.
Phosphates are arranged in DNA
- C.
Amino acids are put together to form a protein
- D.
Chromosomes are arranged in the nucleus
- 16.Specialized cells are found only in
- A.
Animals
- B.
Single-celled organisms
- C.
Bacteria
- D.
Multicellular organisms
- 17.How does a prokaryotic cell differ from a eukaryotic cell
- A.
It is larger
- B.
It does not have a nucleus
- C.
It has no cytoplasm
- D.
It has chloroplasts
- 18.How does natural selection lead to evolution?
- A.
Stronger offspring kill weaker members of the species
- B.
Helpful variations accumulate among surviving members of the species
- C.
Overproduction provides food for stronger members of the species
- D.
Environmental changes favor weaker members of the species
- 19.Which of the following best describes the function of mitochondria?
- A.
They convert energy from food molecules into energy the cell can use
- B.
They store energy from food molecules
- C.
They store energy from sunlight
- D.
They walk around the country handing candy to kids in green hats...NOT RED
- 20.Which of the following is an advantage of solar energy?
- A.
It will not run out for billions of years
- B.
It is not available at night
- C.
No backup energy sources are needed
- D.
It must be collected from a huge area
- 21.What does the notation Tt mean to geneticists?
- A.
Two dominant alleles
- B.
Two recessive alelles
- C.
Homozugous alleles
- D.
One dominant and one recessive alleles
- 22.An organisms that has two identical alleles for a trait is
- A.
Codominant
- B.
Tall
- C.
Homozygous
- D.
Heterozygous
- 23.What does the notation TT mean to geneticists?
- A.
Two dominant alleles
- B.
Heterozygous alleles
- C.
At least one dominant allele
- D.
One dominant and one recessive allele
- 24.Which component of blood carries oxygen to the body cells?
- A.
Plasma
- B.
Platelets
- C.
Red blood cells
- D.
Really small deliverymen that spilled cherry soda on themselves rock'n out to the element song
- 25.What evidence suggests that the ancestors of whales once walked on land?
- A.
Fossils of whale-like creatures have been found with legs
- B.
Whales perform a walking motion as they swim
- C.
Whales have similar DNA to birds
- D.
Whales breath through lungs
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