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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A muscle type that provides voluntary movement and is composed of long, cylindrical cells with multiple nuclei and obvious striations
A) Muscular
G) Respiratory
B) Reproductive
H) Skeletal
C) Digestive
I) Nervous
D) Cardiovascular
J) Endocrine
E) Integumentary
K) Lymphatic
F) Urinary
What is the role of cis-acting and trans-acting factors in transcription? Explain how these factors play a role in the lac operon, and discuss how complementation can be used to identify where the mutations have occurred (structural genes versus
regulatory regions). Which type of mutations can be complemented by a second gene with normal function? Are IS and OC mutants cis- or trans-acting?
To maximize its energy gain, the bird should remain on one tree.
a. true b. false
A recessive allele in dogs causes white spots. If two solid colored dogs are mated and produce a spotted offspring, what is the percentage chance their next puppy would be solid colored?
A) about 90% B) about 66% C) 75% D) 25% E) 50%