Which of the following features is absent in lancelets?
A) Gill slits B) Tail C) Nerve cord D) Notochord E) Backbone
E
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Which of the following is NOT a feature of
trypanosomes? a. anaerobic respiration b. single, large mitochondrion c. cause widespread and serious infections of humans and cattle in the tropics d. life cycle involves an intermediate, bloodsucking insect host e. causative agents of Chagas disease and African sleeping sickness
The eyeless gene of Drosophila
a. has counterparts in humans. b. has counterparts in mice. c. has counterparts in squids. d. points to a shared ancestor among evolutionarily distant animals. e. is all of these.
Transmembrane movement of a substance down a concentration gradient with no involvement of membrane proteins is called ________
Fill in the blank with correct word.
Fertilized chicken eggs are used to culture some vaccine strains.
Answer the following statement true (T) or false (F)