During which stage of pregnancy can Treponema pallidum cross the placenta and possibly infect the fetus?
A. first trimester.
B. second trimester.
C. third trimester.
D. any stage.
D.
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You perform comparative genomic hybridization. You correctly synthesize your red and green DNA, but you forget to treat the DNA with heat before you apply the samples to metaphase chromosomes
What will the ratio of green fluorescence to red fluorescence be? A. 0 B. 1 C. 2 D. There will be no signal
The earliest species known to reproduce sexually was a
a. cyanobacterium. b. green alga. c. fungus. d. red alga. e. archaebacterium.
Which of the following is the last structure that
a sperm travels through as it leaves the body? a. ureter b. urethra c. vas deferens d. ejaculatory duct e. epididymis
During the light-dependent reactions of photosynthesis, a constant supply of electrons is provided by:
a. water. b. oxygen. c. the sun. d. chlorophyll. e. carotenoids