Mussels and sponges sometimes contain methanotrophs as intracellular symbionts because the methanotrophs
A. allow the partnership to use hydrogen sulfide as a source of electrons.
B. remove otherwise toxic levels of methane from the environment.
C. convert methane to carbohydrate for use by the host.
D. All of the choices are correct.
Answer: C
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The sequence and actions of genes controlling development of the anterior-posterior axis of Drosophila illustrate (Select all correct choices):
A. hierarchical control of gene regulation during development. B. maternal developmental effect. C. that genes controlling development are turned on in groups, with each group acting to refine and narrow the pattern of differentiation generated by previous groups. D. that genes controlling development are turned on in sequence, with each set acting on a different set of cells to specify the cells' ultimate fates.
Edward and Patau syndromes are examples of __________
A. aneuploidy B. allopolyploidy C. autopolyploidy D. translocations
When you pick up your backpack and sling into onto your shoulder, your biceps contract
What must occur for your arm to move back down to your side as you walk away?
a. An antagonistic muscle must contract. b. The tendon connected to the biceps must elongate. c. No muscles must contract. d. Not only must an antagonistic muscle contract, but also the tendon connected to the biceps must elongate
What is an organelle that pinches off portions of its membrane to form a transport vesicle?
A. Mitochondrion B. Chloroplast C. Nucleolus D. Golgi body E. Peroxisome