When you hold your breath, which of the following blood gas changes first leads to the urge to breathe?

A) rising oxygen
B) falling oxygen
C) rising carbon dioxide
D) falling carbon dioxide


Answer: C

Biology & Microbiology

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Which of the following organelles is not generally found in animal cells?

A) food vacuole B) centriole C) endoplasmic reticulum D) central vacuole E) mitochondrion

Biology & Microbiology

Organisms that have been genetically engineered are called ____, because they have been modified to contain genetic

information called a(n) ____ from an external source

a. transgenic; transgene b. transgenic; oncogene c. somatic; Ti plasmid d. genetically modified organisms; restriction fragment length polymorphism e. somatic; transgene

Biology & Microbiology

What type of mutation occurred in the following? Normal allele GGAAUGAAACAGGAACCC Mutant allele GGAAUGAAAUCAGGAACCC

A. insertion B. substitution C. deletion D. frameshift

Biology & Microbiology

The descending limb of the nephron loop

A) is not permeable to water. B) responds to high levels of antidiuretic hormone (ADH) in the blood. C) is permeable to salt and urea. D) loses water to the medulla as the filtrate becomes more concentrated. E) pulls water from the renal medulla to make the filtrate more dilute.

Biology & Microbiology