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Biology
Final Exam
Question | Answer |
---|---|
Which of the following is NOT listed as a property of life in your text? A. Order B. Sensitivity to Stimuli C. Movement D. Growth | C. Movement |
The smallest unit of biological structure that meets the functional requirements of "living" is the ______________ | Cell |
Which of the following sequences represents the hierarchy of biological organization from the least complex to the most complex? | C. Organism, population, community, ecosystem, biosphere |
Science is primarily concerned with understanding how the natural world works | TRUE |
Natural selection is a mechanism that drives evolutionary change. The organisms that exhibit a "fit" to their envioronment are the _______________________________. | A. ones that have the ability to survive and reproduce in that environment |
How many electrons does carbon have in its outer shell? | 4 |
When two atoms form a chemical bond and share electrons equally between them, this is known as a ____________________ | Non-polar covalent bond |
List chemical bonds in order from weakest to strongest | Hydrogen bond, ionic bond, covalent bond |
Which of the following pH values indicates the LOWEST concentration of hydrogen ions? 1, 4, 8, 11 | pH=11 |
In lab, how did NaHCO3 (baking soda) act as a buffer when hydrochloric acid was added to the buffered solution? | The baking soda took up the excess hydrogen ions |
Bicarbonate ions facilitate the homeostasis of pH in your blood by bonding with hydrogen ions to become carbonic acid | TRUE |
Water has very unique properties that result from the fact that it is a ______________ molecule | polar |
The four major groups of organic compounds are | Carbohydrates, lipids, proteins & nucleic acids |
The sequence of amino acids in a protein is considered the protein's _________________ structure. | Primary |
Enzymes are catalysts in biochemical reactions. Enzymes can function to ______________________________. | Break molecular bonds, rearrange molecular bonds, form new molecular bonds. (ALL OF THE ABOVE) |
How many carbon atoms are in one glucose molecule? | 6 |
What is Starch's function? | Plant sugar storage |
What purpose to enzymes have? | they are catalysts in biochemical reactions |
What does DNA do? | It carries information for the functioning for the cell |
What do Phospholipids do? | they form the bilayer of the cell's membranes |
Polymer: polysaccharide; Monomer:____________________ | monosaccharide |
Polymer: Protein; Monomer:______________________ | Amino Acid |
Polymer: Nucleic Acid; Monomer: ____________________ | Nucleotide |
R-OH | Hydroxyl |
O= R-C-OH | Carboxyl |
O= R-O-P-OH -OH | Phosphate |
A proposed explanation for a phenomenon or question that can be tested and is falsifiable | Hypothesis |
A propsed explanation for a phenomenon or question that HAS BEEN tested & proven widely and is formed through numerous agreeing experiments | Scientific Theory |
Fatty acid chains that have a bend which prevents numerous fatty acids from attaching to each other and creates oil (unlike saturated fats which are solid and lack this bend) | Unsaturated Fatty Acid |
A substance that absorbs stray hydrogen ions, which maintains a moderate pH despite the addition of acidic substances (until it reaches its limit) | buffer |
the mechanism that allows an organism to maintain its bodily functions, such as regulating temperature | homeostasis |
What number represents the mass number? | the sum of protons & neutrons listed under the name |
Where is the atomic number & what does it represent? | Top left; # of protons |
How does detergent work? | Detergent molecules are solutes. They allow water & oil to move by removing surface tension. Oil is hydrophobic and water is hydrophilic, and the detergent is able to move between these two substances. |
What is the function of MITOSIS? | To allow multicellular organisms to grow and replace damaged cells |
Which stage of the cell cycle is NOT part of interphase? | Mitosis |
What is necessary for a cell to pass the G2 checkpoint? | accurate and complete DNA replication |
What happens during Interphase? | The cell grows, makes proteins, organelles are duplicated, DNA is replicated |
How do daughter cells at the end of MITOSIS and cytokinesis compare with the parent cells in G1 of interphase? | The daughters have the SAME amount of DNA & SAME # of chromosomes |
A diploid cell has _____________________ the number of chromosoes as a haploid cell. | Twice! |
An organism's traits are determined by the specific combination of inherited _______________________ | Genes |
What is a likely evolultionary advantage of sexual reproduction over asexual reproduction? | Sexual reproduction yields greater variety in offspring |
MEIOSIS produces _________________ cells | 4 unique haploid |
At what stage of meiosis are homologous pairs of chromosomes separated from each other? | Anaphase I |
At which stage of meiosis are sister chromatids separated from each other? | Anaphase II |
If a muscle cell of a typical organism has 32 chromosomes, how many chromosomes will be in a gamete of that same organism? | 16 |
What is the reason for doing a test cross? | to identify heterozygous individuals with a dominant phenotype |
When a population has a gene with three alleles circulating, how many possible genotypes are there? | SIX |
What introduces variation into offspring during meiosis? | crossing over & independent assortment. NOT mutation; that doesn't happen during MEIOSIS |
What are the types of gametes that can be produced by an individual with the genotype AaBb? | AB, Ab, aB, ab |
What did Lively (1992) conclude from his study of the freshwater snail and the parasitic worm? | The changing environment caused by the parasitic worms selected in favor of sexual reproduction over asexual reproduction in snails |
_________________ are changes to the nucleotides in a segment of DNA that codes for a protein | gene mutations |
if a disease is caused by a dominant allele, it means that a person with the disease:________________________ | Could either be homozygous or heterozygouls for the allele |
Mendel observed evidence of independent assortment in his peas. What is actually occurring in the pea plant that CAUSES the independent assortment Mendel observed? | homologous chromosomes randomly align in the middle of the cell during metaphase I |
For a gene that is expressed in a dominant and recessive pattern, homozygous dominant (YY) and heterozygous (Yy) organisms will look identical. | TRUE |
Energy is stored long-term in the bonds of __________________ and used short-term to perform work from a(n)_________________molecule | glucose; ATP |
What is the correct chemical equation for cellular respiration? | C6H12O6 + 6O2 = 6CO2 + 6H2O |
High energy electron carriers "drop off" electrons at which stage of cellular respiration? | Electron transport chain |
During the electron transport chain in cellular respiration, ATP is produced when __________________________ | hydrogen ions move down the concentration gradient |
What are the products of alcohol fermentation by yeast? | ethanol, CO2, and NAD+ |
Plants produce oxygen when they photosynthesize. Where does the oxygen come from? | splitting water molecules |
Which color of light does chlorophyll a (the chlorophyll in most plants) absorb? | red & BLUE! |
if a species of gopher has 21% THYMINE bases found in its DN, what percent of its bases will by CYTOSINE? | 29% |
What is the function of nucleic acids? | they carry info |
DNA replicates by which of the following models? | semiconservative |
what are the parts of a DNA nucleotide? | a deoxyribose (5-carbon sugar), phosphate group & nitrogenous base |
the DNA molecule is composed of 2 single strands of nucleotide chains twisted around each other into a double helix. These chains are held together with what type of bond? |