Which of the following nutrients would yield the most energy per gram?
A) Minerals
B) Proteins
C) Vitamins
D) Carbohydrates
E) Lipids
E
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Approximately, how many gene products are
involved in the synthesis of melanin?
a. 10 b. 25 c. 50 d. 100 e. 1000
Undigested material flows from the ascending colon directly into the:a
transverse colon. b. duodenum. c. cecum. d. rectum. e. descending colon.
Serratia marcescens bacteria has a gene that regulates red pigment production by cells. A student inoculates two nutrient agar plates of Serratia and incubates one at 25oC and the other at 37oC. Following incubation, the student observes that colonies on the 25oC plate are red while those on the 37oC plate are nonpigmented. Which of the following statements is a logical conclusion based on these results?
A. This is an example of constitutive gene expression. B. Serratia cells undergo a genotypic change that is proportional to changes in temperature. C. Low temperatures cause repression of certain housekeeping genes. D. Serratia genes for pigment production are induced at certain temperatures.
T cells attack
A. transplanted tissue cells from one host to another. B. cancer cells. C. host cells that have been parasitized by microorganisms. D. All of the choices are correct.