Smoking tobacco regularly during pregnancy
results in all EXCEPT
a. increased risk of miscarriage.
b. newborns of lower birth weight.
c. reduced vitamin C levels for the mother-tobe
and for her fetus.
d. fetal facial and cranial deformities.
e. higher incidence of fetal heart defects.
D
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Which of the following statements is true regarding the use of oligonucleotide primers in PCR?
A. Oligonucleotide primers must hybridize completely to the template DNA strand in order for PCR to proceed; nonhybridized DNA will be degraded. B. The use of oligonucleotide primers is obsolete with the Gibson method of seamless cloning; instead, DNA polymerase and DNA ligase are able to copy the DNA independently. C. Oligonucleotide primers must hybridize to the 5' end of the template strand leaving a 3' primer "overhang"; that sequence will be copied and incorporated into the daughter strands allowing seamless cloning to occur. D. Only a portion of the oligonucleotide primers need to hybridize to the 3' template DNA strand; the 5' "overhang" can contain a restriction site that will be copied during the second and all subsequent cycles of PCR.
Explain how the number of valence electrons is related to the chemical properties of an atom. Use two specific
examples in your explanation. What will be an ideal response?
Which trait provides a survival advantage?
A) A shrub that loses the ability to make seeds B) A brightly colored fish that attracts predators C) A flower that attracts more bees D) A horse that lacks the ability to digest either grains or grass E) A tree that grows shorter than the surrounding trees
The diploid number of chromosomes on a human skin cell is 46. What is the number of chromosomes found in a human egg cell?
A) 92 B) 12.5 C) 23 D) 46 E) 184