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

Biology & Microbiology

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The physiological activity of the brain can be visualized using:

A) PET B) CT C) x-ray D) electron microscopy

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

Epigenetic effects on gene expression may occur through covalent modifications of ________ and ________

Fill in the blank with correct word.

Biology & Microbiology