If a cell from the blastoderm of the Drosophila embryo is committed to form part of an abdominal segment of the adult, such as the sixth one, and this cell is transplanted into the thorax-committed region of another embryo, will it develop properties
of a thoracic or an abdominal segment?
abdominal
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The study of learning has been considerably advanced through studies of the California sea slug Aplysia. Which of the following is NOT a reason Aplysia is well suited to these studies?
A. It has a simple nervous system with only about 20,000 cells. B. Some of its neurons are very large, enabling the insertion of electrodes for recording. C. Some of its neurons are very large, enabling the injection of dyes that allowed tracing the paths and connections of these neurons. D. The large size of some neurons allowed isolation of proteins and mRNAs from these neurons. E. All of the choices for this question are correct.
Stem cells (unspecialized cells) that develop into bone cells have undergone which type of process?
A. Involution B. Convergent extension C. Embryonic development D. Cellular differentiation E. Cellular respiration
In the light-dependent reactions of
photosynthesis, how do hydrogen ions get back into the stroma?
a. passive diffusion directly across the thylakoid membrane b. active transport accross the thylakoid membrane c. facilitated diffusion across the thylakoid membrane d. active transport through ATP synthase e. passive diffusion through ATP synthase
Archaeons have been isolated from both temperate and cold environments.
Answer the following statement true (T) or false (F)