Test 1

Question 1

What is the smallest unit that has all characteristics of life?

Answer 1

The cell.

Question 2

2. Which sequence correctly lists the different levels of biological organization, from the smallest and simplest to the largest and most complex?

Answer 2

cells-tissues-organs-organ systems-organism

Question 3

3. Which sequence of classification categories is in the proper order from least to most inclusive?

Answer 3

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

Question 4

What kingdom does corn belong to?

Answer 4

Kingdom Plantae

Question 5

What are the 3 major domains of life?

Answer 5

Archaea, bacteria and eukaryotes.

Question 6

6. A multicellular, photosynthetic organism with complex, specialized cells and tissues would most likely be assigned to

Answer 6

Kingdom Plantae.

Question 7

7. All the organisms of various species living within a given area constitute a

Answer 7

Community.

Question 8

8. A possible explanation for a natural event, based on observations and past knowledge, is a

Answer 8

Hypothesis.

Question 9

9. Which statement regarding the scientific method is false?

Answer 9

A control group is always exposed to the factor being tested.

Question 10

10. Which answer choice lists the steps of the scientific method in the correct order?

Answer 10

observation, hypothesis, experiment, data collection, conclusion.

Question 11

11. Which statement about living organisms is not correct?

Answer 11

Living organisms create energy.

Question 12

12. The body temperature in humans is maintained around 37°C. Which characteristic of life does this information represent?

Answer 12

Living things are homeostatic.

Question 13

Which of the following is one of the domains of life?

Answer 13

Eukarya.

Question 14

Which classification category includes the most species?

Answer 14

Kingdom.

Question 15

Which statement is false regarding science?

Answer 15

Correct scientific conclusions are permanent and never subject to change or refinement.

Question 16

Which statement regarding the scientific method is false?

Answer 16

Original hypotheses are formed after an experiment.

Question 17

Which statement regarding the scientific method is false?

Answer 17

Theories formed in everyday life carry the same validity as a scientific theory.

Question 18

When researchers test a new human cancer drug using mice, the mice constitute

Answer 18

the model.

Question 19

Which of the following domains contains organisms that are adapted to life in harsh environments?

Answer 19

Domain Archaea.

Question 20

Which domains contain organisms that lack a membrane-bound nucleus?

Answer 20

Archaea and bacteria.

Question 21

You have discovered a previously unknown organism. It is multicellular, with a filamentous form, and absorbs food from its environment. Upon microscopic examination, you see that the cells have nuclei. How would you classify this organism?

Answer 21

Kingdom funghi.

Question 22

You are conducting an experiment to determine which brand of fertilizer results in the greatest amount of fruit production by tomato plants. In this example, the response variable would be

Answer 22

the amount of fruit produced by the tomato plants.

Question 23

You are conducting an experiment to determine what concentration of disinfectant is most effective in killing bacteria. In this example, the concentration of disinfectant would represent

Answer 23

the experimental variable.

Question 24

The smallest unit of matter that can enter into chemical reactions and is nondivisible by chemical means is called a(an)

Answer 24

Atom.

Question 25

Which of the following is a subatomic particle of an atom?

Answer 25

Electrons, protons and neutrons.

Question 26

The atomic mass of an atom is equal to

Answer 26

the number of protons plus the number of neutrons.

Question 27

Which of the following statements is true?

Answer 27

Electrons have a negative charge and equal the number of protons.

Question 28

What determines whether or not an atom reacts with other atoms?

Answer 28

the number of electrons in the outer shell.

Question 29

The carbon atom has an atomic number of 6 and an atomic mass of 12. Therefore, a carbon atom has

Answer 29

6 protons.

Question 30

______ are atoms that have the same number of protons but differ in the number of neutrons.

Answer 30

isotopes.

Question 31

Chlorine has an atomic number of 17 and an atomic mass of 35. When chlorine becomes the chloride ion, its charge is

Answer 31

Negative one.

Question 32

Chlorine has an atomic number of 17. How many electrons are in the outermost shell?

Answer 32

7

Question 33

The sodium atom has an atomic number of 11. Therefore, there are two electrons in the outermost orbit.

Answer 33

False.

Question 34

The molecule, K+Cl-, is held together by

Answer 34

Ionic bonds

Question 35

13. If an atom either gains or loses an electron, the atom is called a(an)

Answer 35

Ion.

Question 36

14. Atoms react with one another in order to achieve four electrons in their outer shell.

Answer 36

False.

Question 37

Which type of bond will share electrons between atoms?

Answer 37

Covalent.

Question 38

15. An individual water molecule is held together by

Answer 38

Covalent bonds.

Question 39

Many water molecules are weakly held together by

Answer 39

Hydrogen bonds.

Question 40

The fundamental unit of life is the

Answer 40

Cell.

Question 41

The cell theory states that all living things are composed of atoms.

Answer 41

True.

Question 42

Which of the following statements is FALSE?

Answer 42

Cell walls are found inside the plasma membrane of a cell.

Question 43

The ______ membrane separates the contents of the cell from the surrounding environment.

Answer 43

Plasma.

Question 44

The information center of the cell is the

Answer 44

Nucleus.

Question 45

______ is/are the site of protein synthesis in the cytoplasm.

Answer 45

Smooth endoplasmic reticulum.

Question 46

Which type of organelle forms a membranous system of channels, which is continuous with the nuclear envelope and branches throughout the cytoplasm?

Answer 46

Endoplasmic reticulum.

Question 47

What is the correct organelle sequence for the export of material out of a cell?

Answer 47

rough ER --> smooth ER --> Golgi apparatus.

Question 48

The ______ function(s) in the packaging, storage, and distribution of molecules produced by the ER.

Answer 48

Golgi apparatus.

Question 49

Which plant organelles function as storage areas for water, sugars, salts, pigments, and toxic substances?

Answer 49

Vacuoles.

Question 50

Which organelle contains hydrolytic enzymes that can digest macromolecules?

Answer 50

Lysosomes.

Question 51

Which organelle is used when the fingers of a human embryo are at first webbed but later freed from one another?

Answer 51

Lysosome.

Question 52

Vacuoles are more prominent in plant cells than in animal cells.

Answer 52

True.

Question 53

Study this reaction: energy + carbon dioxide + water ----> carbohydrate + oxygen. This chemical transformation is called

Answer 53

Photosynthesis.

Question 54

Study this reaction: carbohydrate + oxygen ----> carbon dioxide + water + energy. This chemical transformation is called

Answer 54

Cellular respiration.

Question 55

Which organelle is responsible for this chemical transformation: energy + carbon dioxide + water ----> carbohydrate + oxygen?

Answer 55

Chloroplast.

Question 56

Which organelle is responsible for the process of photosynthesis?

Answer 56

Chloroplast.

Question 57

Which organelle is called the powerhouse of the cell because of its role in cellular respiration?

Answer 57

Mitochondria.