A ________ is a circular or U-shaped ridge around the mouth, bearing either one or two rows of ciliated, hollow tentacles.
What will be an ideal response?
Lophophore
lophophore
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Which of the following chemicals is used to
induce polyploidy?
a. colchicine b. ethylene c. gibberellin d. cytokinin e. auxin
__________ are responsible for absorption and anchoring of a plant, while __________ are involved
in photosynthesis. a. Roots; leaves b. Stems; leaves c. Leaves; reproductive structures d. Reproductive structures; stems e. Roots; pollen
What limits how big a cell can be?
a. Color b. Wavelength c. The surface area to volume ratio d. Resolution e. Type of electron microscopy.
A neuron and a white blood cell have very different functions. For example, a neuron can receive and respond to electrical signals while a white blood cell defends the body against infection. This is because ______
(a) the proteins found in a neuron are completely different from the proteins found in a white blood cell. (b) the neuron and the white blood cell within an individual have the same genome. (c) the neuron expresses some mRNAs that the white blood cell does not. (d) neurons and white blood cells are differentiated cells and thus no longer need to transcribe and translate genes.