The DNA code for a protein (i.e. a codon) occurs in groups of __________ bases.
A) two
B) three
C) four
D) five
Answer: B) three
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Species - as opposed to individuals or populations - are considered the ultimate evolutionary unit because (select all correct choices)
A. new mutations can potentially spread within a species, but not beyond it. B. species can become extinct. C. species give rise to other species. D. changes in gene frequencies over time can only be observed within species, not within populations. E. none of these
The vascular bundles in eudicot stems separate the ground tissue into two zones. Which sequence correctly describes the arrangement of those zones from the outside to the center?
a. epidermis ? vascular bundle ? pith ? cortex b. pith ? vascular bundle ? cortex ? epidermis c. epidermis ? cortex ? vascular bundle ? pith d. epidermis ? vascular bundle ? cortex ? pith e. cortex ? epidermis ? vascular bundle ? pith
Epigenetic effects on gene expression may occur through covalent modifications of ________ and ________
Fill in the blank with correct word.
The physiological activity of the brain can be visualized using:
A) PET B) CT C) x-ray D) electron microscopy