Why is external water not essential for fertilization in seed plants?
A. The sperm cells in seed plants are capable of resisting desiccation.
B. Seed plants use pollen instead of sperm for fertilization.
C. Pollen grains are transported by wind or an animal.
D. Sperm cells are used to transport pollen to the archegonia.
E. Ovules are contained within the pollen.
C. Pollen grains are transported by wind or an animal.
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Acid rain is the result of ____
a. the burning of fossil fuels b. the greenhouse effect c. contamination with CFCs d. desertification e. deforestation
If you want to develop a procedure for identifying a genetic disorder caused by 20 different alleles, what method is most likely to be useful?
A) Arrays of DNA probes on filter paper B) STRs C) Gene therapy D) PCR
Which of the following statements about antibiotic resistance in bacteria is NOT true?
A. The antibiotic resistance gene can be transmitted to bacteria via transformation or transduction. B. Environments where antibiotics are frequently used such as hospitals are under higher risk of giving rise to bacteria with antibiotic resistance. C. Antibiotic resistance cannot be conferred by conjugation as conjugation only affects the fertility of bacteria. D. Antibiotic resistance often originates from the microbes that produce antibiotics for their own survival. E. The plasmid containing the antibiotic resistance gene can pass the gene to genetically unrelated bacteria.
When a dog's brain detects the need to dissipate excess heat and the dog begins to pant, the brain acts as the ________, and the panting behavior acts as the ________.
A. sensor; integrating center B. integrating center; effector C. integrating center; sensor D. stimulator; effector