Biochemistry
What is the difference between covalent bonds and ionic bonds?
Covalent bonds involve the sharing of electrons between atoms; ionic bonds have an electrical attraction between atoms.
Which of the following structures is shared by all LIVING cells?
Cell Membrane Chloroplast
Endoplasmic Reticulum Nucleus
Mitochondrion
Cell Membrane
When the cell cycle divides out of control what can happen?
cancer can occur.
An animal has two unlinked genes, one for head shape (Hh) and one for tail length (Tt). The animals genotype is TtHh. What is a possible genotype of the sperm (gamete)?
TH
Th
tH
th
The core theme of biology, which explains both the unity and diversity of life is...
Evolution
Name a feature that is made possible by water's ability to form hydrogen bonds?
Animals and Plants cool off using evaporative processes
Ice Floats on liquid water
The ocean keeps Earth's temperature in a reasonable range
If a cell's lysosomes burst, the cell would . . .
Digest itself
What contribution did Griffith make to the discovery of DNA?
worked with mice that were infected with transformed bacteria.
Metaphase I
Why do organisms tend to produce adaptive changes in populations?
Natural Selection
What is the relationship between dehydration reactions and hydrolysis?
Dehydration reactions assemble polymers; hydrolysis reactions break polymers apart
During active transport, in which direction do molecules move?
Up (against) the concentration gradient
The following steps describe the process of replication of the lagging strand of DNA
1. DNA polymerase builds the new strand.
2. Primase inserts an RNA primer
3. DNA Polymerase replaces the RNA primer with DNA
4. Ligase joins the fragments of DNA.
5. Helicase unwinds the parental DNA
5,2,1,3,4
Synapsis and crossing over occur in meiosis during ______________
Prophase I
When does microevolution, or evolution at its smallest scale occur?
When a populations allele frequencies change over a span of generations.
What type of mutations has a more detrimental effect; an insertion of 3 nucleotides or a deletion of 1 nucleotide near the start of the polypeptide chain?
Deletion of 1 at the start
What happens when an enzyme catalyzes a reaction?
It lowers the activation energy of the reaction.
A recessive allele on the X chromosome is responsible for hemophilia. A woman who is a carrier for the hemophilia gene marries a male who suffers from hemophilia. What is the probability that this couple's son will have hemophilia?
50%
In sexual life cycles both _________ and their________ are haploid
gametophytes and gametes
What is an example of a postzygotic barrier used to maintain the genetic separation between two species? Example is a horse and donkey breeding to create a mule.
hybrid sterility
How do cells become differentiated?
Different genes are expressed so that different proteins are produced.
Most of the cell's enzymes are classified as
Proteins
Which of the following, when take up by a cell, binds to a repressor so that the repressor no longer binds to the operator?
Inducer
It is theoretically possible for a gene from any organism to be transferred and remain function in a completely different organism. Why is this possible?
All organisms have the same genetic code.
Darwin was influenced by a book by Charles Lyell that suggested the earth was old and sculpted by geologic processes that _______________ today.
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