Aspiration of peritoneal fluid using a needle and syringe is:
a. acceptable.
b. not acceptable.
A
Because indigenous anaerobes are often present in large numbers as normal flora on mucosal surfaces, even minimal contamination of a specimen can give misleading results. In general, ma-terial for anaerobic culture is best obtained by tissue biopsy or by aspiration using a needle and syringe.
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An mRNA sequence is 5?-AUG GGC ACU CAU ACU UAA-3?, where AUG is the start codon and UAA is the stop codon. How many distinct aminoacyl-tRNA synthetases are required to translate the mRNA sequence?
A. 2 B. 3 C. 4 D. 5 E. 6
Hormone action is associated with small quantities of hormone resulting in profound responses in
target tissues. This type of response is
a. amplification. b. a second messenger response. c. a gene activation response. d. a cyclic AMP response. e. a growth factor response.
What is a field of research studying how traits are inherited through the interactions of alleles called?
Which property of water would help to account for how an individual who is exercising and producing excessive heat can maintain a constant body temperature?
a. Water has high heat capacity. b. Water is less dense than ice. c. Water is a good solvent. d. Water is cohesive. e. Water molecules form by covalent bonding.