Runners are modified stems that resemble roots and are also known as ____.
A. stolons
B. rhizomes
C. bulbs
D. corms
E. tubers
Answer: A
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Match the structure of the amniotic egg with the correct description.
1. Allantois 2. Yolk sac 3. Chorion 4. Amnion a. Protection of the embryo b. Gas exchange c. Compartmentalizes wastes d. Contains nutrients
Each HIV particle possesses a ________ on its surface, called gp120, that precisely binds to a protein, called CD4, that is found on the surfaces of the immune system cells called macrophages and T cells.
A. glycoprotein B. phospholipid C. polysaccharide D. glycolipid E. nucleic acid
Which of the following scientist-discoveries is mismatched?
A. Griffith-chromosomes. B. Watson, Crick, Wilkins, and Franklin-DNA structure. C. Meselson and Stahl-mechanism of DNA replication. D. Avery, MacLeod, and McCarty-DNA is the genetic material.
A glass capillary tube containing a chemical was placed inside a turbid pure culture of cells. Most cells moved away from the tube, but some cells were found inside the capillary tube. The chemical is likely
a. an attractant to all cells, but only a few had time to go into the tube. b. an attractant to most cells and a repellent to those within the tube. c. a repellent to all cells, and some cells by chance were within the tube. d. a repellent to most cells and an attractant to those within the tube.