All of the following structures arise from placodes, EXCEPT
A. Lens of Eye
B. Membranous Labyrinth of Inner Ear
C. Neurohypophysis
D. Olfactory Mucosa of Nose
E. Vestibular Ganglia of Inner Ear
Answer: C. Neurohypophysis
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Which of the following is a change to the nucleotides in a segment of DNA that codes for a protein?
a. Proto-oncogenes b. Tumor suppressor genes c. Gene mutations d. Negative regulators
Normally in humans, all the sons of a female homozygous for a sex-linked recessive gene will inherit that trait
Indicate whether the statement is true or false
An egg with 22 chromosomes that is fertilized by a normal sperm will result in
a. a zygote with trisomy. b. a zygote with disomy. c. a zygote with monosomy. d. a zygote with normal chromosome number.
DNA replication is considered semiconservative because ____________________________
(a) after many rounds of DNA replication, the original DNA double helix is still intact. (b) each daughter DNA molecule consists of two new strands copied from the parent DNA molecule. (c) each daughter DNA molecule consists of one strand from the parent DNA molecule and one new strand. (d) new DNA strands must be copied from a DNA template.