Of the following list, flagellated (swimming) sperm are generally present in which groups?
1. Lycophyta
2. Bryophyta
3. Angiosperms
4. Chlorophyta
5. Pterophyta
A) 1, 2, 3
B) 1, 2, 4, 5
C) 1, 3, 4, 5
D) 2, 3, 5
E) 2, 3, 4, 5
Ans: B) 1, 2, 4, 5
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Jack has type O blood and his mother has type A blood. His father could have any of the
following blood types EXCEPT
a. A. b. B. c. AB. d. O.
The structure indicated by the letter “B” above
represents a. actin. b. myofibril. c. myosin. d. sarcoplasmic reticulum. e. muscle fiber.
According to the pressure-flow hypothesis, which of the following statements is NOT true?
a) Water moves from the xylem to the phloem of a plant. b) Water is necessary for sugars to move through phloem. c) Phloem is able to move sugars in either direction to meet the nutritional needs of the plant. d) The movement of water into a nutrient-rich region of the phloem decreases the pressure in that region.
________ are toxic proteins secreted by pathogenic bacteria, and ________ are toxic components of the outer membrane of gram-negative bacteria
A) Endotoxins; parasites B) Endotoxins; botulinum toxins C) Exotoxins; enterotoxins D) Exotoxins; endotoxins