Sem. 1 Biology Exam

Front 1

In a water molecule, shared electrons spend more time around the oxygen atom than the hydrogen atoms. As a result, the oxygen atom is:

Back 1

slightly negative

Front 2

Which property of water causes the curved surface on water in a graduated cylinder:

Back 2

adhesion

Front 3

If an atom contains 11 protons and 12 neutrons, its atomic number is:

Back 3

11

Front 4

A solution is a:

Back 4

mixture in which the substances are evenly spread out

Front 5

Which of the following makes up a molecule of water:

Back 5

two atoms of hydrogen and one atom of oxygen

Front 6

Which of the following is NOT true about chlorine?

Back 6

It is not reactive

Front 7

If the pH of stomach acid and of oven cleaner were measured:

Back 7

the pH of stomach acid would be below 7, but the pH of oven cleaner would be above 7

Front 8

What type of ion forms when an atom loses electrons?

Back 8

positive

Front 9

Why is carbon so special compared to other elements?

Back 9

Carbon atoms have four valence electrons and can form quadruple bonds

Front 10

Amino acid is to protein as

Back 10

fatty acid is to lipid

Front 11

In chemical reactions, atoms are

Back 11

rearranged

Front 12

Carbon-12 is the most common isotope of carbon. It has 6 protons, 6 neutrons, and 6 electrons. Of its 6 electrons, 4 are valence electrons. How many covalent bonds can a carbon atom form?

Back 12

4

Front 13

Which of the following is a substance formed by the chemical joining of two or more elements?

Back 13

compound

Front 14

The energy needed to get a reaction started is the

Back 14

activation energy

Front 15

Isotopes are atoms of the same element with the same number of protons and a different number of:

Back 15

neutrons

Front 16

Identify the reactant(s) in the chemical reaction, CO2+H2O-->H2CO3

Back 16

CO2 and H2O

Front 17

What type of electron is available to form bonds?

Back 17

valence

Front 18

The three particles that make up atoms are

Back 18

protons, neutrons, and electrons

Front 19

Democritus believed that atoms

Back 19

could not be divided

Front 20

A covalent bond is formed as the result of

Back 20

sharing electrons

Front 21

What are found in the space surrounding the nucleus of an atom?

Back 21

electrons

Front 22

A substance that speeds up the rate of a chemical reaction is called:

Back 22

a catalyst

Front 23

A structure that can move excess water out of unicellular organisms such as Paramecium is a

Back 23

contractile vaculole

Front 24

Plasmolysis of a human red blood cell would occur is the cell were

Back 24

in a hypertonic solution

Front 25

All forms of passive transport depend on

Back 25

the kinetic energy of molecules

Front 26

A type of transport in which water moves across a membrane down its concentration gradient is

Back 26

osmosis

Front 27

The process of diffusion requires

Back 27

a concentration gradient

Front 28

Who used a compound microscope to see chambers w/n cork and named them "cells"

Back 28

Robert Hooke

Front 29

The cell does NOT apply to

Back 29

rocks and soil

Front 30

Looking at a cell under a microscope, you note that it is a prokaryote. How do you know?

Back 30

The cell lacks a nucleus

Front 31

Which of the following enclose their DNA in a nucleus?

Back 31

eukaryotes

Front 32

Which sequence correctly traces the path of a protein in a cell?

Back 32

ribosome, endoplasmic reticulum, Golgi apparatus

Front 33

Which organelles are involved in energy conversion?

Back 33

mitochondria and chloroplasts

Front 34

The primary function of the cell wall is to

Back 34

support and protect the cell

Front 35

Which of the following is a function of the cell membrane?

Back 35

regulates the movement of materials into and out of the cell

Front 36

The cell membrane contains channels and pumps that help move materials from one side to the other. What are these channels and pumps make of?

Back 36

proteins

Front 37

Diffusion occurs because

Back 37

molecules constantly move and collide with each other

Front 38

The diffusion of water across a selectively permeable membrane is called:

Back 38

osmosis

Front 39

Which term describes the relatively constant internal physical conditions of an organism?

Back 39

homeostasis

Front 40

Which of the following is an example of an organ?

Back 40

heart

Front 41

A group of similar cells that perform a particular function is called

Back 41

a tissue

Front 42

Which list represents the levels of organization in a multicellular organism from the simplest level to the most complex level

Back 42

cell, tissue, organ, organ system

Front 43

Energy is released from ATP when

Back 43

a phosphate group is removed

Front 44

Organism, such as plants, that make their own food are called

Back 44

autotrophs

Front 45

Which of the following organisms makes its own food using light energy from the sun?

Back 45

oak

Front 46

Plants gather the sun's energy with light-absorbing molecules called

Back 46

pigments

Front 47

Most plants appear green because chlorophyll

Back 47

does not absorb green light

Front 48

Photosynthesis uses sunlights to convert water and carbon dioxide into

Back 48

oxygen and high-energy sugars

Front 49

A granuum is a

Back 49

stack of thylakoids

Front 50

The stroma is the region outside the

Back 50

thylakoids

Front 51

Where in the chloroplast is chlorophyll found?

Back 51

in the thylakoid membrane

Front 52

A student is collecting the gas given off from a plant. The gas being collected is probably

Back 52

oxygen

Front 53

Why are electron carriers needed for transporting electrons from one part of the chloroplast to another?

Back 53

High-energy electrons are highly reactive

Front 54

When NADP+ accepts and holds two high-energy electrons, what else gets bonded to the molecule as part of the reaction

Back 54

a hydrogen ion

Front 55

Which of the following is NOT found in the overall reaction for photosynthesis?

Back 55

nitrogen

Front 56

Where do the light-dependent reactions take place?

Back 56

w/n the the thylakoid membranes

Front 57

What are the products of the light-dependent reactions?

Back 57

ATP, NADPH, and oxygen gas

Front 58

Where are photosystems I and II found?

Back 58

in the thylakoid membrane

Front 59

Which of the following activities happens within the stroma?

Back 59

The Calvin cycle produces sugars

Front 60

The Calvin cycle is another name for the

Back 60

independent reactions

Front 61

What is a product of the Calvin cycle?

Back 61

high-energy sugars

Front 62

If carbon dioxide is completely removed from a plant's environment, what would you expect to happen to the plant's production of high-energy sugars?

Back 62

No sugars will be produced