The bands on chromosomes correspond to
A. gene-poor regions.
B. gene-rich regions
C. regions where specific proteins attach to the chromosomes.
D. regions actively transcribing RNA.
E. regions where genes are not transcribing RNA.
A
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Light entering a human eye travels through structures in this order:
A. cornea, aqueous humor, pupil, lens, vitreous humor, retina. B. sclera, cornea, lens, aqueous humor, iris, vitreous humor, retina. C. aqueous humor, iris, pupil, lens, vitreous humor, retina. D. lens, cornea, vitreous humor, pupil, iris, aqueous humor, retina.
A tumor is actively producing both VEGF and FGF, factors associated with angiogenesis. However, no network of blood vessels to the tumor has been established in spite of the fact that blood vessels are nearby. This observation most likely suggests that
A) the VEGF and FGF are not functional. B) angiogenesis inhibitors are in greater concentration. C) only one of the molecules is active, not both. D) angiostatin is not produced by the cancer cells. E) the tumor is metastatic.
Epigenetic changes
A) pass from one cell generation to the next but do not alter the DNA sequence. B) do not pass from one cell generation to the next but do alter the DNA sequence. C) irreversibly alter the DNA sequence and are only passed to the next cell generation if they add an advantage. D) alter the RNA codon, which are amino acid assignments of the genetic code.
Which of the following cells are alive at maturity?
a. sieve tube members b. vessel members c. tracheids d. vessel members and tracheids e. sieve tube members and vessel members