spring 2012 final exam review gateways to biology

Spring 2012 Final Exam Review

Gateways to Biology

Ch 3.1 – Solar Energy Transformations

What is the chemical reaction for photosynthesis?

sun6 CO2 + 6 H2O C6H12O6 + 6 O2


What are the reactants of photosynthesis?carbon dioxide & water

What are the products of photosynthesis?glucose (sugar) & oxygen


What is the specialized tube in plants called that carries water from the roots to the rest of the plant?

xylem

Ch 3.1 – Solar Energy Transformations Identify three factors that affect the

rate of photosynthesis and explain the effect of each.

1. Amount of light2. Amount of water3. Temperature4. Access To CO2

Ch 3.2 – Energy Transformations in Ecosystems

What do the arrows represent in a food chain?

the direction of the transfer of energy

Ch 3.2 – Energy Transformations in Ecosystems

Describe how much energy gets passed from one energy level to another in a food chain.

10% of the available energy 90% of the energy is used and

released a s heat

Producers – transform light energy into usable chemical energy (sugars)consumers – consume 10% of the available energy from the previous trophic leveldecomposers – consume 10% of the available energy from any of the trophic levels in a food chain

What is function of bacteria in ecosystem?

To fix nitrogen from the atmosphere into the soil for the plants to use.

Ultimate source of energy in any food chain is

Ch 3.3 – Energy in Foods

What is the chemical formula for high energy sugar (glucose)?

C6H12O6

Ch 3.3 – Energy in Foods

Fiber in a healthy diet is supplied by which nutrient?

carbohydrates

How is the energy available in food measured?

Burning it and measuring the change in temperature in water

What is a calorie?

The amount of energy needed to raise the temperature of 1 gram of water 1˚ Celsius

Ch 3.4 – Transforming Food Energy in Usable Nutrients

Where does digestion begin?

the mouth (with amylase)


What is the function of the large intestine?

reabsorbs water


What kind of proteins catalyze (speed up) metabolic reactions in the body?

enzymes


Name the organs of the digestive system that food passes through in the proper order and describe the function of each organ.

1. mouth: chewing, mech. and chem. digestion

2. Esophagus: transports food bolus to stomach

Ch 3.4 – Name the organs of the digestive system that food passes through…

3. Stomach: mech and chem digestion

4. Small Intestine: absorption of nutrients

5. Large Intestine: reabsorption of water

6. Rectum: wastes exit body

What is the function of the villi in the small intestine?

The villi are the site of nutrient absorbtion and increase the surface area of the small intestine in order to maximize the amount of nutrients being absorbed

Function of pancreas?

Makes enzymes to digest foods, such as starch (amylase)

Produces a substance to neutralize stomach acid

What is the enzyme found in saliva that breaks down carbohydrates? amylase

3.5 Cellular Respiration and Energy Transformations What are the steps

in the process of cellular respiration?

1. Glycolysis

2. Krebs Cycle

3. electron

transport chain

Cellular Respiration

Glycolysis Krebs cycle (aka

citric acid cycle) Electron transport

chain

How does the body maintain homeostasis when the concentration of carbon dioxide increases?

The body will continue to break down glucose (glycolysis) without oxygen in order to make ATP

lactic acid builds up in muscles and keeps them from contracting resulting in muscle fatigue

In the presence of oxygen how many net ATP molecules will one glucose molecule produce?

36 net38 total

Air is forced into the lungs by the contraction of what?

The diaphragm

Ch 4.1 – DNA: The Molecule of Life

Why is DNA known as the molecule of life?

Because it contains the hereditary material (DNA).


What is the base pairing rule for DNA?

thymine pairs with adenine cytosine pairs with guanine


What is the structure of DNA?

double helix


Which enzyme links nucleotides to the open strand of DNA?

DNA polymerase


What makes up the backbone of DNA?

sugar and phosphates


What is the sequence that complements the DNA sequence ATGCCATGC?

TACGGTACG


Why does DNA unzip and separate into single strands to form two identical copies?

To ensure that each new cell has exact copies of genetic material.

Ch. 4.2 – Cell Growth through Cell Division

What takes place in prophase? Nuclear membrane breaks

down. DNA condenses Centrioles divide and move

toweards opposite sides of the cell

Spindle fibers form between the centrioles


In which phase of the cell cycle does DNA replicate?

S phase (synthesis)


Chromatids attach to each other at what?

centromere


In which phase of the cell cycle does the nucleus divide through a series of steps?

Mitosis


Be able to

identify pictures

of the phases

of mitosis.


What kind of cell is an undifferentiated cell that can become almost any type of cell in the body?

stem cell


What is the process where unspecialized cells develop into adult cells?

cell differentiation


What is the best surface area to volume ratio for moving materials into and out of cells?

6:1 (largest ratio)

Ch. 4.3 – Plant Growth and Development

What are the two plant hormones that stimulate growth?

auxins and giberrellins


What is the function of apical meristem tissues?

New cells are added along the tips of root and stems that elongate and differentiate into other tissues.


Know the

parts of a

cross-section

diagram

of a leaf.


What is the structure on roots that increases the surface area for water absorption in plants?

root hairs


What are some

characteristics of seeds

that require animals for

dispersal? That require

the wind for dispersal?

That require water for

dispersal?


What are some characteristics of a plant that survives in a dry environment?

types of leaves, types of roots, modifications to stems


After seeds have soaked in water for several days, a root emerges from the enlarged seeds. What conclusion can be made from this observation?

Energy stored in seeds is activated and used to grow roots to anchor the plant and establish a system for obtaining water.

What structure regulates movement of gases in and out of leaves?

stomata

Ch. 4.4 – Reproduction

Why do flowers have more pollen grains than ovules in the ovary?

Because the pollen grains have to travel to the ovary.


What is the main difference between mitosis and meiosis?

The results of meiosis provide a greater variety of genetic outcomes while mitosis produces a clone of the original cell.


The male and female reproductive systems are similar in several ways. Which pair of organs is most similar in structure and function?

vas deferens to fallopian tube


Why are gametes haploid?

Haploid gametes maintain the species’ chromosome number during fertilization.


Which reproductive organs play a role in both the reproductive and endocrine systems?

ovaries and testes


Which reproductive organ functions to protect fertilized ova?

ovary


What is an advantage of asexual reproduction?

Energy is conserved because production of gametes is not required.

Ch. 4.4 – Reproduction Explain the similarities and differences

between asexual and sexual reproduction. Include examples of both in your response.

Similar – both produce new organisms Different – asexual produces exact copy

of parent; sexual requires haploid gametes from 2 parents for a new individual


Explain the similarities and differences between asexual and sexual reproduction. Include examples of both in your response.

Examples: Asexual: budding, fission. Sexual: pollination, fertilization.

Ch. 5.1 – Protein Synthesis

What is the sequence of mRNA bases for the correct transcription of the DNA sequence 5’GGGACATGATTCGCC3’?

3’CCCUGUACUAAGCGG5’


What is the role or job of tRNA in protein synthesis?

tRNA bring amino acids to the ribosomes to help make proteins.


What is the type of mutation represented by the amino acid sequence below?

Correct sequence:Leucine – Alanine – Glycine – LeucineMutated sequence:Leucine – Alanine – Valine – Leucine

Substitution


Which series of amino acids is the correct translation of the mRNA molecule represented here - 3’CCU AAA AGU GCA5’?

proline, lysine, serine, alanine


Translate the following DNA strand to determine the correct order of amino acids - 5’CGG CAA TTT AAC3’.

alanine, valine, lysine, leucine


A gene represented by the DNA strand 5’AGA GGG CCA AAT3’ undergoes a mutation. Which type of mutation would have the greatest affect on a person’s health?

the more codons affected, the more the affect on the final protein


Which molecule transcribes the code for proteins?

mRNA molecule

Ch. 5.2 – Genetics

If the letters P and p represent alleles of the same gene, then a cat with the genotype Pp would be considered what?

Heterozygous or hybrid


What is Mendel’s law of segregation?

Parent alleles separate into different gametes during meiosis.


What is the phenotypic ratio of the F1 monohybrid cross of two heterozygotes?

3:1

Ch. 5.2 – Genetics In pea plants, tallness is dominant

over shortness and yellow seed color is dominant over green seed color. If pea plants that are heterozygous for tallness and heterozygous for seed coat color is crossed, what are the possible alleles in the gametes?

TY, Ty, tY, ty

Ch. 5.3 – Human Genetics

Skin color and eye color are examples of what type of inheritance?

polygenic traits

Ch. 5.3 – Human Genetics In snapdragons, R represents

red flowers and r represents white flowers. In the cross RR x rr, all of the offspring have pink flowers. What is this pattern of inheritance?

incomplete dominance

Ch. 6.1 – Natural Selection

What is natural selection?

Natural selection determines which phenotypes in a population support survival.


Survival of the populations of organisms hinges on adequate supplies of food, water and shelter. What would limit available resources?

competition


Mutualism is a type of symbiotic relationship between two species that supports survival of both species. What is an example of a mutual relationship?

bees pollinate flowering plants


How are traits for camouflage and mimicry are result of natural selection?

Predators recognize, hunt and eat prey.


How do mutualism, parasitism and commensalism influence natural selection?

Mutualism – benefits both organisms Parasitism – benefits one, harms the

other Commensalism – benefits one, but not the

other Since organisms depend on each other, if

one dies, the other could follow.

Ch. 6.3 – Classification

What taxonomic group is the most general?

Kingdom Kingdom Phylum Class Order Family Genus Species

Ch. 6.3 – Classification

What is binomial nomenclature based on?

genus and species

Ch. 6.3 – Classification Based on the characteristics of the

unknown organism, how should it be classified?

Characteristics of unknown organismeukaryoticmulticellularheterotrophicextracellular digestion

fungus

spring 2012 final exam review gateways to biology

Documents

transfer of energy slide

available energy

energy available

water slide

transforming food energy

light energy

energy level

food chain slide