Answer the following statements true (T) or false (F)
1. Most transcription factors active in early development are morphogens.
2. Adult stem cells are always unipotent.
3. The shoot meristem is totipotent.
4. A cell's fate is determined while the cell is differentiating.
5. The molecular structure of invertebrate homeotic genes differs significantly from that of mammals.
1. TRUE
2. FALSE
3. FALSE
4. FALSE
5. FALSE
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What is common to all of the oxidation reactions in the Krebs cycle?
A. They all lead to the generation of NADH. B. They are all decarboxylation reactions. C. They are all characterized by a loss of electrons from an organic molecule coupled to the reduction of an electron acceptor. D. They all lead to substrate-level phosphorylation of ADP to generate ATP.
Scientists often study lichens to look at the effects of acid rain. Why?
a. Lichens absorb water directly from air. b. Lichens are located in many diverse environments. c. Lichens can withstand droughts. d. Lichens get water from the area directly beneath trees.
The waxy barrier called the directs water from the roots into the endodermis and then into the xylem.
A. Casparian strip B. companion cells C. cuticle D. sieve tubes E. epidermis
In each nephron the, ____ arteriole divides to form the peritubular capillary network.
Fill in the blank(s) with correct word