What is found in the channels within the Haversian system?
a. cartilage
b. extracellular fluid
c. intracellular fluid
d. blood vessels and nerves
e. calcium stores
ANSWER: d
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Which protein relaxes supercoils by nicking the DNA?
A) topoisomerase B) helicase C) primase D) ligase E) telomerase
Will is a graduate student working in a microbiology lab. He is given the task of characterizing a newly discovered nitrogen fixing bacterium. What type of tests or observations will help him determine whether it is a member of the Cyanobacteria, alphaproteobacteria, or gammaproteobacteria?
What will be an ideal response?
The set of mRNAs that share a particular mRNA-binding protein is called a(n)
a. regulatory RNA unit. b. mRNA cohort. c. mRNA community. d. RNA regulon. e. mRNA family.
Mechanisms that evolved in plants to regulate the rate of water loss do not include
A. becoming dormant during dry times of the year. B. losing leaves. C. producing leaves that are thick and hard. D. containing stomata in crypts or pits. E. increasing the number of water vacuoles in the cells.