Which disease involves transmission by aerosolized water from whirlpool spas, air conditioners, cooling towers, and supermarket vegetable misters?
What will be an ideal response?
Legionellosis
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The organ system that is responsible for transporting nutrients, gases, hormones, and antibodies for immune response.
A) Muscular
G) Respiratory
B) Reproductive
H) Skeletal
C) Digestive
I) Nervous
D) Cardiovascular
J) Endocrine
E) Integumentary
K) Lymphatic
F) Urinary
Active -galactosidase enzyme is observed only in E. coli growing in the presence of lactose. One hypothesis is that the enzyme is always being produced, but is produced in an unstable form that breaks down rapidly in the absence of lactose (hypothesis 1)
A second hypothesis is that the enzyme is stable, but is produced only in the presence of lactose (hypothesis 2). An experiment was performed to test these hypotheses. A culture of growing cells was exposed to lactose, which was later removed. The amount of -galactosidase present in the culture during the course of the experiment was measured. The data are shown in the graph below. Which one of the following statements is a conclusion that can be obtained from these experimental data? A. The amount of -galactosidase in the culture decreased rapidly after lactose was removed, in support of hypothesis 2. B. The amount of -galactosidase in the culture decreased rapidly after lactose was removed, in support of hypothesis 1. C. The amount of -galactosidase in the culture remained stable after lactose was removed, in support of hypothesis 1. D. Synthesis of -galactosidase is turned on when lactose is added and turned off when lactose is removed, in support of hypothesis 2. E. Synthesis of -galactosidase is turned on when lactose is added and turned off when lactose is removed, in support of hypothesis 1.
Water has a molecular weight of 18 g per mole, and glucose has a molecular weight of 180 g per mole
Which of the following would have an approximately equal number of water and glucose molecules?
a. 1 g of water and 180 g of glucose b. 90 g of water and 9 g of glucose c. 180 g of water and 1 g of glucose d. 9 g of water and 90 g of glucose e. 90 g of water and 90 g of glucose
In eukaryotes the DNA molecule that makes up a chromosome is typically ____ and usually has ____
replication origin.
a. circular; one b. circular; more than one c. linear; more than one d. linear; one e. linear; no