Which of the following cells do not kill cells directly?
A. T cells
B. macrophages
C. natural killer cells
D. B cells
E. neutrophils
Answer: D
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The Black Death was caused by which microbial species?
A. Serratia marcescens B. Escherichia coli C. Saccharomyces cerevisiae D. Yersinia pestis E. Staphylococcus aureus
Artemia and Fast Plant™ bioassays can be used to identify
a. cytotoxins. b. herbicides. c. plant growth stimulators. d. all of the above.
How does a digested nutrient enter the bloodstream?
A) through a series of large pores in the duodenum B) through tiny blood vessels inside the microvilli C) through the liver D) through small openings in the epithelium of the stomach
In fruit flies, males are determined by the presence of an X and Y chromosome; females are determined by two X chromosomes. The gene for eye color is located on the X chromosome and is absent from the Y chromosome. The allele for white eyes is recessive and the allele for red eyes is dominant. If a red-eyed male is mated with a white-eyed female, what is the probability that their male offspring will be white-eyed?
A. 100% B. 50% C. 25% D. 0%