Farmers have been able to genetically engineer a wide variety of crops that possess an enormous diversity of traits. If a farmer wanted to increase the ability of his crops to access ground water that is several meters below ground which type of root system would he want?
A. aerial roots
B. taproot
C. fibrous roots
D. pneumatophores
E. prop roots
Answer: B
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Which of the following tumor-suppressor genes encode proteins that inhibit cell division when cell conditions are unfavorable?
A. BRCA1. B. Rb. C. NF1. D. p16. E. All of these are tumor-suppressor genes, so they all produce proteins that inhibit cell division.
________________ is directional growth responses of plants to a unidirectional source of light.
A. Gravitropism B. Thigmotropism C. Dormancy D. Phototropism E. Thermotropism
Together, what are the calyx and corolla known as?
a. anther b. gynoecium c. perianth d. style
How does the skin act as a barrier to microbial invasion?
A) It releases B cells and T cells to fight infections. B) Dendritic cells patrol the skin's surface, producing secretions that inhibit microbe growth. C) Dead skin cells are packed with keratin, an antibacterial protein that punches holes in bacterial membranes. D) Sweat and sebaceous gland secretions inhibit bacterial growth.