Which group is composed of autotrophs?

A. primary producers
B. primary consumers
C. secondary consumers
D. decomposers


A. primary producers

Biology & Microbiology

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The material in the gray crescent of a frog embryo is necessary for normal development

a. True b. False

Biology & Microbiology

The large number of alveoli in lungs improve gas exchange by _____.  

A.  increasing the concentration difference B.  changing the diffusion constant C.  decreasing the distance for diffusion D.  increasing the surface area for diffusion

Biology & Microbiology

Cytotoxic T cells destroy cancerous cells by

A. releasing vesicles containing perforin. B. opsonization. C. activating natural killer cells. D. secreting cytokines. E. forming the membrane attack complex.

Biology & Microbiology

Answer the following questions true (T) or false (F)

1. Lipid A can cause septic shock. 2. Lymph is produced in the lymph nodes. 3. Small doses of antimicrobial drugs are effective in treatment of the late stages of Borrelia infection because the microbe is extremely susceptible.

Biology & Microbiology