Compare and contrast the formation, properties, and characteristics of covalent and ionic bonds. What will be an ideal response?
Both covalent and ionic bonds result in each atom having a filled valence shell. Covalent bonds are
formed via the sharing of electrons between neutral atoms; the resulting molecule is electrically
neutral but can be polar or nonpolar. Ionic bonds are formed via the transfer of electrons; in the
process ions are formed, and the resulting molecule is held together via the electrical attraction
between those positive and negative ions. Unlike atoms joined by a covalent bond, atoms joined by an
ionic bond tend to dissociate into their respective ions when placed in water.
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Variations in pre-mRNA processing, such as in ____, can determine which ____ are made in cells
a. alternative splicing; proteins b. exon shuffling; proteins c. alternative splicing; transcripts d. histone modifications; transcripts e. genomic imprinting; transcripts
The probability of a match being due to chance diminishes as the number markers used ____________
a. increases b. decreases
Fertilization results in formation of _____________ within the uterine tube.
A. diploid gamete B. diploid zygote C. haploid zygote D. haploid gamete
What is the primary reason internal homeostasis must be maintained?
A) Most organisms have not evolved mechanisms to control positive feedback systems. B) Enzymes must retain their correct three-dimensional structure. C) Homeostasis prevents the wasting of stockpiles of coenzymes. D) Unregulated variations cause the cells' DNA to mutate. E) Wide swings in the internal environment interfere with normal metabolic reactions.