Which trait is polygenic in humans?
A. sickle-cell disease
B. blood type
C. cystic fibrosis
D. height
D. height
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Roots and shoots are similar in that:
A. primary growth in both roots and shoots results from the apical meristem. B. actively growing roots are much thicker than stems. C. the root and shoot apical meristems are both covered by a protective cap when actively growing. D. new meristem in the roots and shoots develop from the pericycle. E. both roots and shoots contain a waxy band around their endodermal cells, protecting the vascular tissue.
Answer the following statements true (T) or false (F)
1. Soil can contain the spores that cause botulism, gas gangrene, and tetanus. 2. Chlamydial genital infections and gonorrhea are the two most common nationally notifiable infectious diseases in the United States. 3. The levels of chlorine routinely used for water treatment are sufficient to kill Giardia cysts and Cryptosporidium oocysts. 4. Yersinia pestis, the bacterium that causes plague, is one of the pathogens most often discussed as a potential biologic weapon. 5. Gonorrhea is considered to be a communicable disease, but not a contagious disease.
What is an example of a haptophyte?
a. Aveolate b. Ochrophyte c. Diatom d. Coccolithophore
Which of the following is a secondary sexual trait?
a. ovulation in females b. production of semen in males c. facial hair in males d. ovaries in a female e. testes in males