Identify the feature found in Cooksonia that qualifies it as a vascular plant.
A. the production of windblown spores
B. the presence of branches
C. presence of leaves
D. presence of roots
E. the production of seeds
Answer: B
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Which group has the largest number of chromosomes?
a. hepatophytes b. gymnosperms c. angiosperms
d. lycophytes e. charophytes
A muscle fiber contracts by a sequence of events initiated by the binding of acetylcholine to its receptor. Which of the following is the correct sequence?
I-The calcium-troponin complex pulls tropomyosin away from the myosin binding sites of actin. II-The freed-sites of actin bind to myosin to form cross bridges. III-Calcium ion binds to the troponin. A. II, III, and I B. III, II, and I C. III, I, and II D. I, III, and II E. I, II, and III
anion or cation? potassium
What will be an ideal response?
Implantation occurs in the
a. ovary. b. uterus. c. vagina. d. oviduct. e. follicle.