Friday
October 31, 2014

Homework Help: life science

Posted by joe on Wednesday, May 12, 2010 at 4:53am.

An organism's ability to maintain steady internal conditions despite changes in its external environment is called

biogenesis
homeostasis
osmosis
respiration

In an organism, a virus enters, and reproduces within, a(n)

host cell
infection
interferon
parasite

The theory that living things come only from other living things is called

biogenesis
development
ecology
spontaneous generation

A _____________ is a prediction that can be tested.

hypothesis
scientific law
theory
variable

A(n) __________ becomes part of a cell's DNA without immediately destroying the cell or replicating.

host
active virus
vaccine
latent virus

Treating genetic disorders such as sickle-cell anemia by enclosing helpful DNA in a virus and alowing the virus to enter defective cells is a type of

antibiotic
gene therapy
parasitism
vaccine

A solution containing inactive virus that is used to prevent a viral disease is a

vaccine
gene therapy
lysosome
bacteriophage

A bacterial cell DOES NOT have

a cell wall
cytoplasm
DNA
a nucleus

Proteins are made in cell structures called

chloroplasts
lysosomes
Golgi bodies
ribosomes

In plant cells, food, water, and waste products are stored in structures called

chloroplasts
mitochondria
lysosomes
vacuoles

_____________ is a virus-caused disease that affects the human immune system.

Botulism
AIDS
Pneumonia
Tuberculosis

Sugars, starch and cellulose are examples of organic compounds called

carbohydrates.
enzymes.
lipids.
nucleic acids.

The material that permanently stores the genetic blueprints of the cell is

RNA
lysosome
chromosome
cytoplasm

Green plants are producers that use light energy to make

chlorophyll
glucose
proteins
starch

Organic compounds in the chromosomes are _______________________.

carbohydrates
lipids
nucleic acids
water molecules

Most of the life of any cell is spent in a period of cell growth and development called ________________.

interphase
metaphase
prophase
telophase

Each human skin cell has __________ chromosomes.

13
18
46
52

Proteins are made of units of ____________ linked together in a specific order.

amino acids
centrioles
centromeres
cytoplasm

In sexual reproduction, a new organism is produced when _____________.

cells divide by mitosis

sex cells from two parents combine

an organism divides into two equal parts

a new organism grows from the body of its parent

During meiosis the cell nucleus divides _____ times.

one
two
three
four

The nucleus of an atom contains ____________________.

protons and neutrons
protons and electrons
protons, neutrons, and electrons
chromosomes

The theory of biogenesis states that ____________________.

living things come only from nonliving things

living things can be made artificially from chemicals in the laboratory

living things come only from other living things

all living things came from viruses


Human sex cells have 46 individual chromosomes.

True
False

Animal cells have rigid cell walls.

True
False

Structures that store food, water, and waste products in plant cells are called mitochondria.

True
False

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