The white, sticky, toxic liquid that runs through some plant veins and is particularly common in plants of the milkweed family is called ___________
A. filament
B. nectar
C. alkaloid
D. latex
E. tannin
D
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When species are kept separate by preventing the formation of hybrid zygotes, the mechanism that keeps the species separate is known as a _____________ isolating mechanism.
A. hybridization B. postzygotic C. prezygotic D. adaptive E. differential
Which of the following statements is false?
A. After entering the uterus, sperm must pass through the cervix in order to enter the fallopian tubes. B. During ovulation the oocyte is expelled from the ovary and enters the fallopian tubes. C. The oocyte is the largest cell by volume in the human body. D. Some types of cervical mucus block the passage of sperm, whereas other types guide sperm. E. If an oocyte is not fertilized then it is removed from the body through menstruation.
This protozoa has a trophozoite stage but no cyst stage and reproduces via longitudinal binary fission. The parasite belongs to which category?
a. Amebae b. Flagellates c. Ciliates d. Microsporidia
Chromosome number for a species is 34. When a cell divides by mitosis, the daughter cells have how many
chromosomes? a. 17 b. 34 c. 51 d. 68 e. 119