Boa constrictors are Pythons lack external limbs but their skeletons reveal bones of tiny hind limbs. What structure is represented in this example?
A. Convergent
B. Vestigial
C. Homeotic
D. Analogous
E. Homologous
B. Vestigial
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What is the key concept addressed by the question?
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. Plants are unable to use nitrogen gas directly. 2. Sunlight can actually be so intense that photosynthesis can be stopped. 3. Nitrogen is one of the most abundantly applied fertilizers worldwide. 4. When body temperature drops below normal, a person starts shivering uncontrollably. This is an example of negative feedback.
Which activity of the virally invaded cell triggers production of interferon?
A. Activation of rRNA B. Movement of nuclear proteins to the cytoplasm C. Production of glycolipids D. Production of dsRNA
Plasmids of bacteria often have genes involved in:
a. reproduction. b. motility. c. viral resistance. d. antibiotic resistance. e. photosynthesis.