What is periderm?
a. special epidermal cells that regulate gas exchange
b. outer layer of the vascular cylinder in a plant root
c. layers of cells just inside root endodermis
d. dermal tissue that replaces epidermis on the surfaces of older stems and roots
e. tissue that consists of densely packed dead cells with thickened, waxy walls
ANSWER: d
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Sponges (phylum: Porifera) are animals that possess feeding cells called collar cells. These cells have a central flagellum surrounded by a collar of microvilli. The collar filters organic matter out of the water column. Which protist shares a more recent common ancestor with the poriferans?
A. Ciliates B. Rhodophyta C. Choanoflagellates D. Radiolarians E. Myxomycota Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about Porifera? How does it relate to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
As observed in animal stem cells, plant stem cells are able to
A. exist as mature cells. B. produce nutrients for other cells. C. remain undifferentiated but can divide to produce cells that generate new tissues. D. fight microbial invaders by becoming mobile and phagocytic.
The function of the catabolite activator protein (CAP) is to:
a. increase the affinity of the promoter region for RNA polymerase. b. decrease RNA polymerase activity. c. deactivate RNA polymerase after binding to AMP. d. bind to and activate RNA polymerase directly. e. block RNA polymerase from accessing the DNA template.
Glycolysis and the Krebs cycle reactions both occur in the mitochondria
Indicate whether the statement is true or false