Extra Credit

Question 1

Which are molecules that lymphocytes recognize as foreign and that elicit in immune response

Answer 1

Antigens

Question 2

What is the primary function of endonucleases in constructing recombinant DNA molecules

Answer 2

Identify and extract desires DNA fragments

Question 3

which carries the coded instructions for an amino-acid sequence to the ribosome

Answer 3

tRNA

Question 4

chromosomes are produced in what part of the eukaryotic cell

Answer 4

nucleus

Question 5

genetic engineering of plants can produce crops with new and beneficial

Answer 5

traits

Question 6

if a allele is recessive and lethal in homozygotes before they reproduce

Answer 6

the allele will remain in the population at a low frquency

Question 7

which is a prokaryotic cell that causes disease when it is ingested in contammined food or water

Answer 7

bacterium

Question 8

which is a product of the electron chain transport

Answer 8

ATP

Question 9

second generation offspring from a cross between two homozygotes are the

Answer 9

F2 generation

Question 10

most HIV infections a transmitted through

Answer 10

Blood

Question 11

except for stop codons, a codon calls for a specific

Answer 11

amino acid

Question 12

which organelle in the diagram below is known as the powerhouse of the cell
question #18

Answer 12

mitochondria

Question 13

the DNA message depends on the order of the

Answer 13

nitrogenous bases

Question 14

DNA replication is

Answer 14

semiconservative

Question 15

which statement is true

Answer 15

in mitosis the chromosomes separate once while in meiosis the chromosomes separate twice

Question 16

based on the food pyramid below which organism has the least amount of energy available to it
question#24

Answer 16

owl

Question 17

which statement accurately describes the role of a particular organelle

Answer 17

the golgi apparatus synthesizes and stores proteins

Question 18

what is the purpose of the cell membrane

Answer 18

to form a boundary to allow wastes in and out of the cell

Question 19

natural selection is sometimes called survival of the fittest. which most accurately describes an organisms fitness

Answer 19

fertility of its offspring

Question 20

if the genotype of the parents are known, it is possible to determine the likelihood of an offspring inheriting certain

Answer 20

phenotype

Question 21

proteins catalyze biochemical reactions without altering the reaction equilibrium are called

Answer 21

enzymes

Question 22

when DNA replicates, each new DNA molecule has

Answer 22

one original strand and one new strand

Question 23

which carry impulses from the skin to the central nervous system

Answer 23

sensory neurons

Question 24

usable energy is captured from the sunlight by

Answer 24

chloroplast

Question 25

deviations from the Hardy-Weinberg equation can cause what in a gene pool

Answer 25

drift

Question 26

What is the primary function of nephrons in the kidneys

Answer 26

To remove wastes from the blood

Question 27

if the bark on all trees of the type shown below became spotted over a period of years, what effect would this most likely have on the beetle population

Answer 27

most beetles would be spotted

Question 28

imagine that you have just touched a warm burner. which type of neuron would relay a message to your brain

Answer 28

sensory neuron

Question 29

fluctuations in population size in an ecosystem are determined by the relative rates of all of the following except

Answer 29

over feeding

Question 30

strips of land that allow the organisms of a population to migrate from one area to another are called

Answer 30

habitat corridors

Question 31

natural selection acts on

Answer 31

phenotype, whether they are results of dominant or recessive genes

Question 32

what digestive aid is secreted to break down fat molecules

Answer 32

lipase enzymes

Question 33

one form of protection against disease given to small children and adolescents

Answer 33

vaccination

Question 34

what do chromosomes determine

Answer 34

sex of offspring

Question 35

one application of DNA fingerprinting is used to correct genetic disorders. This Is called

Answer 35

gene therapy

Question 36

to be inherited by future generations, a gene mutation would have to occur in

Answer 36

sex cells

Question 37

a heterozygote has

Answer 37

a pair of contrasting alleles

Question 38

the most vital part of an ecosystem is found in the stability of its

Answer 38

producers and composers

Question 39

nucleotide bases are read how many at a time

Answer 39

three

Question 40

rules of probability apply to the inheritance of traits coded by

Answer 40

a single gene

Question 41

an antibody is used by the immune system to identify foreign matter. an antibody is a(an)

Answer 41

protein

Question 42

tissues, organs, and organ systems work together to maintain

Answer 42

a stable enviroment

Question 43

the evolution of a new species is called

Answer 43

speciation

Question 44

a diagram depicting the pattern of shared characteristics between organisms is called a

Answer 44

cladogram

Question 45

proteins having different amino-acid sequences have different

Answer 45

shape and chemical properties

Question 46

in muscle cells, a protein that plays a significant role in the contraction is

Answer 46

actin

Question 47

variation within a species increases the likelihood that at least some members of a species will

Answer 47

survive

Question 48

which base is complementary strand of the base shown below (thymine)

Answer 48

adenine

Question 49

the first line of defense against disease in the human body is

Answer 49

the skin

Question 50

if both parents are heterozygous for two particular genes, how many phenotypes are possible

Answer 50

four

Question 51

how often are new mutations generated in a gene pool

Answer 51

constantly

Question 52

look at the following for descriptions of changes in gene frequency between a larger population and a smaller, related population. which of these is an example of natural selection

Answer 52

adaptive change

Question 53

homeostasis is maintained by

Answer 53

negative controls

Question 54

assuming that the reading frame begins after the start signal AUG, how many amino acids are coded for in this mRNA sequence AUG-UUA-CAC-CGU-CAC

Answer 54

four

Question 55

the picture below show two neurons. A nerve impulse moves from neuron A to neuron B because of

Answer 55

the release of chemicals called neurotransmitters

Question 56

what purpose do molecular clocks serve

Answer 56

they allow scientist to estimate the relative chronology of evolutionary relationships

Question 57

what is nitrogen fixation

Answer 57

the principle that describes why nitrogen stays at a fixed level in the atmosphere