biology test (online school)

which scientific area is a major force in shaping modern classification methods?

evolution

which would least likely be a cause of natural selection

evolution

Which motion of particles across a membrane requires energy?

from low concentration to high concentration

which organelle packages and distributes proteins that are received from the endoplasmic reticulum?

golgi apparatus

which type of evidence is least likely to result in changes to a phylogenetic tree?

physical characteristics

a teacher says she has identified an organism with these characteristics: eukaryotic, multicellular, autotrophic, and a cell wall made of cellulose. Which kingdom is the teacher describing?

plantae

Why do classification systems change over time?

scientists find new evidence in their studies

the discovery of mitochondrial DNA (mtDNA) had no effect on which area of scientific investigation?

study of cork bark

natural selection is a process by which organisms that are better adapted to their environment tend to

survive

for diffusion to occur, which condition must be met?

A concentration gradient must exist.

which kingdom contains organisms that are multicellular, heterotrophic, eukaryotic, and lack in cell walls?

Animalia

which kingdom is known to contain organisms that have cells with no cell wall?

Animalia

what are the three domains of life?

Bacteria, Archaea, Eukarya

which is the best characteristic that distinguishes the kingdom archaebacteria from the kingdom eubacteria

cell wall structure

which discovery supported the endosymbiotic theory?

DNA in mitochondria

a chemical has been found to harm the same components in both prokaryotic and eukaryotic cells. Which components are those?

DNA, cell membrane, cytoplasm, ribosomes

What are the six kingdoms of life?

Eubacteria, Archaebacteria, Protista, Fungi, Plantae, Animalia

which best describes mitochondrial DNA (mtDNA)

Mitochondrial DNA can be traced for generations.

which kingdom(s) include organisms that are autotrophic or heterotrophic?

Protista and Eubacteria

Why is taxonomy important?

Taxonomy allows a better understanding of relationships among species.

Which reason best explains why the cell membrane helps the cell maintain homeostasis?

The cell membrane is selectively permeable.

A student wonders whether removing the nucleus from a cell would result in a new prokaryotic cell. Why would this procedure fail to produce a prokaryotic cell?

The cell would lack genetic information.

which is the best definition of a phylogenetic tree?

a branching chart that depicts evolutionary relationship among organisms

What is natural selection?

a process that selects variations that help with survival and that spreads the variations to more offspring

which organelles are found only in plant cells?

cell wall and chloroplasts

Which homeostatic process moves particles against a concentration gradient?

active transport

Which homeostatic process requires energy to move particles across the plasma membrane?

active transport

what is the basic unit of structure and function of all living organisms?

cell

which plant-cell organelle supports and maintains the cells shape and protects the cell from damage?

cell wall

which is most likely to change with new discoveries and technology?

classification of organisms

in which specimen were cells first identified?

cork bark

which cell structure serves the stated function in both eukaryotic cans prokaryotic cells?

cytoplasm: protects cell structures

the species that is known as a robin in England has a yellow breast, and another species that is known as the robin in the United States has a red breast. Which statement about common names does this fact best exemplify?

different species can share the same common name.

which best describes the difference between osmosis and diffusion?

diffusion is the moment of particles from a high to low particle concentration, while osmosis is the movement of water from a high to a low water concentration

which of the following lists the order of taxonomic levels from the largest to the smallest group?

domain, kingdom, phylum, class, order, family, genus, species

scientists group organisms into kingdoms by looking at specific characteristics. Which is a characteristic of a carrot plant?

eukaryotic

James is making models of plant and animal cells using objects supplied by his teacher to represent organelles. For one cell, he will place the objects in a shoebox. First he fills a balloon with water and places it in the shoe box. He also drops a handful of marbles into the box. Which statement most likely describes the structures he has represented so far?

he is making a plant cell. the box is the cell wall, and the balloon represents the large vacuole. the marbles are the tiny ribosomes.

Which was Charles Darwin's contribution to the study of biology?

he proposed that natural selection is the primary mechanism of evolution

which solution would most likely cause a plant placed in it to become firmer and more rigid?

hypotonic

in the african savanna, more wildebeests are brown than the environment can support. Which is most likely to happen over a period of years as a result?

individuals that are well suited to the environment reproduce, and those that have lesser adaptations die before they can reproduce

which statement describes natural selection

it is the primary mechanism for evolution

how does the contractile vacuole in a single-celled organism function to maintain homeostasis?

it pumps water out of the cell

which he's describes the relationship between evolution and natural selection

natural selection leads to evolution

which structure is unique to eukaryotic cells?

nucleus

water makes up a large percentage of the body's cells. For a cell to remain in homeostasis, there must be a mechanism to control water changes in the cells. The movement of water from and area of high water concentration to an area of low water concentration is?

osmosis

a population of which rabbits and brown rabbits both live in a temperate deciduous forest where the summers are mild and average about 50 degrees Fahrenheit. the winters are often below freezing. If warmer temperatures last longer into the fall and the average temperature in the winter is getting market, what do you expect to happen to the population of each color rabbit?

the brown rabbit population will thrive and reproduce, and the white rabbit population will slowly die out.

why is it important to classify the millions of species on earth?

to organize them and speak about them accurately

which statement about vacuoles is true?

vacuoles are larger in plant cells than in animal cells