Which of the following statements is false?
a. Root hairs live only a few days
b. Nodules containing bacteria enable plants to
increase their absorption of nitrogen.
c. The Casparian strip of the endodermis facilitates
the movement of water into the vascular
cylinder.
d. Water may travel between the cortex but must
move through the cytoplasm of endodermal cells.
e. Some plants have an exodermis with a Casparian
strip.
Answer: c
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Diploid cell formed by the union of two gametes; the product of fertilization.
What will be an ideal response?
Molecular-based phylogies place the phylum Platyhelminthes in the Protostomia. How do scientists best explain the morphological differences between flatworms and the other members of the Lophotrochozoa?
A. Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one. B. The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom. C. Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution. D. Some Platyhelminthes have a coelom but others do not and it is difficult to conclude anything about its evolution within the clade. E. Platyhelminthes originated from ancestors with a coelom and have retained it to the present time.
Which statement is true about strain a?
Consider the pathway for the synthesis of the amino acid arginine in Neurospora:
Mutant strains of Neurospora may carry one or more mutations. Neurospora mutant strain a is grown on minimal media plus supplements as shown. Growth is shown by (+) and no growth is shown by (o). Growing strain a cells accumulate citrulline.
A) It has one mutation in ARG-H.
B) It has two mutations, one in ARG-F and one in ARG-H.
C) It has two mutations, one in ARG-E and one in ARG-H.
D) It has two mutations, one in ARG-E and one in ARG-F.
E) It has mutations in ARG-E, ARG-F, and ARG-H.
Density-________ growth is the inverse relationship between population density and individual growth
Fill in the blank(s) with correct word