Grade 7 Cells Final Review B Question Preview (ID: 6639)


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What is the chromosome theory of inheritance?
a) Chromosomes are carried from parents to offspring on hybrids.
b) Genes are carried from parents to offspring on chromosomes.
c) Hybrid pairs of chromosomes combine to form offspring.
d) Codominant genes combine to form new hybrids.

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

A DNA molecule is shaped like a
a) long, thin rod.
b) spiral staircase.
c) straight ladder.
d) triple helix.

Together, respiration and photosynthesis keep the levels of carbon dioxide and oxygen in the atmosphere
a) constantly changing
b) constantly increasing
c) constantly decreasing
d) fairly constant

What happens during photosynthesis?
a) The cell uses oxygen to make food.
b) The cell uses the energy in sunlight to make food.
c) The cell uses glucose to make oxygen.
d) The cell uses the energy in sunlight to make carbon dioxide.

A substance that cannot be broken down into simpler elements is a(n)
a) particle
b) element
c) carbohydrate
d) compound

Which term refers to the diffusion of water molecules through a selectively permeable membrane?
a) osmosis
b) engulfing
c) active transport
d) passive transport

Why is water important for a cell?
a) Water is the main ingredient in DNA.
b) All proteins are made of water.
c) Most chemical reactions in cells require water.
d) Water is an essential organic compound for the body.

Which organelle is the control center of a cell?
a) mitochondrion
b) ribosome
c) nucleus
d) chloroplast

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.

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