In an obstructive disease, the lungs can become overinflated because the difficulty in ________ tends to ________.
A) expiration : decrease total lung capacity and vital capacity
B) inspiration : increase total lung capacity and vital capacity
C) expiration : increase residual volume and total lung capacity
D) expiration : increase vital capacity
E) inspiration : decrease total lung capacity and vital capacity
Answer: C) expiration : increase residual volume and total lung capacity D) expiration : increase vital capacity
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Human growth hormone (HGH) is a peptide hormone that stimulates growth, cell division and regeneration. HGH is made in the anterior pituitary gland. A researcher wants to introduce the gene encoding human growth hormone into E. coli so she can produce large quantities of the peptide hormone for medical treatments. What strategy should the researcher take?
A. Obtain the HGH gene from a human anterior pituitary gland cDNA library. B. Obtain an HGH gene from another prokaryote. C. Obtain the HGH gene from a human genomic library produced from DNA of the anterior pituitary gland. D. Obtain the HGH gene from a human genomic library produced from DNA from any human tissue. E. Obtain an HGH gene from either a genomic or cDNA library.
The primary cause of human population growth following the Industrial Revolution was
a. an increase in death rates. b. a decrease in death rates. c. an increase in birthrates. d. a decrease in birthrates e. more children being born to women over 35 years of age.
Which is not true of the cell membrane?
A) It is made up of a phospholipid monolayer. B) It can seal tiny breaks in itself. C) It is selectively permeable and can regulate passage of material through it. D) Many kinds of proteins are embedded in the membrane
Factors that help to limit growth of woody plants in temperate grasslands include
A) nutrient-poor soil and high insect diversity. B) fires and grazing by large mammals. C) large numbers of cacti and small numbers of grazing mammals. D) mild winters and low annual precipitation.