TEXES LIFE SCIENCE 238 UPDATED Exam Questions and CORRECT Answers
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Course
TEXES LIFE SCIENCE 238
Institution
TEXES LIFE SCIENCE 238
TEXES LIFE SCIENCE 238 UPDATED
Exam Questions and CORRECT Answers
Covalent Bonding - Correct Answer- the sharing of a pair of valence electrons by two atoms.
Example: two hydrogen atoms bonded as a hydrogen molecule.
Ionic Bond - Correct Answer- A chemical bond resulting from the attraction b...
TEXES LIFE SCIENCE 238 UPDATED
Exam Questions and CORRECT Answers
Covalent Bonding - Correct Answer- the sharing of a pair of valence electrons by two atoms.
Example: two hydrogen atoms bonded as a hydrogen molecule.
Ionic Bond - Correct Answer- A chemical bond resulting from the attraction between
oppositely charged ions.
Hydrogen Bond - Correct Answer- Weakest bond of the 3.
Formed when the slightly positive hydrogen atom of a polar covalent bond in one molecule is
attracted to the slightly negative atom of a polar covalent bond in another molecule or in
another region of the same molecule.
Hydrolysis - Correct Answer- a chemical reaction that breaks down bonds between two
molecules by the ADDITION of water; functions in disassembly of polymers to monomers.
Helicase - Correct Answer- Enzymes that untwist the double helix at the replication forks,
separating the two parental strands and making them available as template strands.
Transcription - Correct Answer- One strand of DNA molecule is copied into an RNA
molecule.
Steps: Initiation, elongation, and termination.
Where does Translation occur at in the cell? - Correct Answer- Ribosome
Properties of Water - Correct Answer- High specific heat, good solvent, high freezing points.
The Krebs cycle produces which 8 molecules? - Correct Answer- 6 NADH and 2 FADH2
The Electron Transport Chain - Correct Answer- Occurs in mitochondria, does not make ATP
directly, Net gain is 34 molecules of ATP
Law of Segregation - Correct Answer- When sex cells form, the two alleles that determine a
trait will end up on different gametes.
5 requirements to keep the Hardy-Weinberg equilibrium stable: - Correct Answer- NO
mutation, NO selection pressures, an isolated population, a large population, and random
mating.
Biological Species Concept - Correct Answer- states that a species is a reproductive
community of populations that occupy a specific niche in nature. APPLIES TO SEXUAL
ORGANISMS.
Homologous structures - Correct Answer- have the same genetic basis (leading to similar
appearances, but are used for different structures)
Phylum Arhropoda - Correct Answer- consists of insects, crustaceans, and spiders. They are
the largest group in the animal kingdom.
Peristalsis - Correct Answer- Process of wave like contractions. This process allows food to
be carried down the pharynx and through the digestive tract.
What does the neurotransmitter do? - Correct Answer- Turns off the Na+ pump, which results
in the depolarization of the membrane.
Acetycholine - Correct Answer- This is the most common neurotransmitter.
Acoelomates - Correct Answer- Have no defined body cavity. ex: Flatworm
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