Which of the following describes a plant shoot growing upward?
a. positive gravitropism
b. negative thigmotropism
c. negative gravitropism
d. positive feedback
c. negative gravitropism
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At which of the following stages of meiosis would homologous chromosomes be paired?
A) prophase of meiosis I B) both prophase of meiosis I and prophase of meiosis II C) metaphase of meiosis I D) metaphase of meiosis II E) both prophase of meiosis I and metaphase of meiosis I
During allopatric speciation, the first event is usually
a. geographic separation of two populations. b. a hybridization event. c. competitive exclusion. d. disruptive selection. e. a prezygotic reproductive barrier.
The letter "D" in the above figure represents
a. a kidney. b. a urethra. c. a urinary bladder. d. a ureter. e. water
Culture of patient specimens to detect pathogens is usually done on blood agar plates only.
a. true b. false