When a plant blocks fertilization after recognizing pollen as genetically related, this is called
A. self-incompatibility.
B. self-fertilization.
C. self-pollination.
D. outcrossing.
Answer: A
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Which of the following statements about mammalian cleavage is false?
A. The embryo increases in overall size during cleavage. B. It occurs more slowly than cleavage in other organisms. C. Early divisions do not occur at the same time. D. Zygotic transcription begins as early as the two-cell stage. E. Cell divisions extend completely through the egg.
The Taenia multiceps tapeworm is 5 to 6 cm long and consists of 200 to 250 segments. It has four suckers in its scolex and a proboscis with 22 to 32 hooks arranged in two rows. This organ-ism causes which condition?
a. Coenurosis b. Cysticercosis c. Hydatid disease d. Sparganosis
Which event would trigger the release of ADH?
a. a drop in blood pressure below normal b. elevated blood glucose levels c. the process of childbirth d. stimulation of the anterior pituitary e. growth promoting factors
How does resistance to drugs spread in bacterial populations?
A) Exposure to drugs causes mutations in bacterial genes. B) Horizontal gene transfer between bacteria spreads R (resistance) plasmids. C) Genetic recombination during sexual reproduction. D) Exposure to drugs induces immunity. E) Exposure to drugs alters gene expression in bacteria.