Fruit ripening is promoted by ____
a. ethylene
b. jasmonates
c. gibberellins
d. brassinosteroids
e. abscisic acid
ANSWER: a
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Which of the following events occur during anaphase I of meiosis?
A. The chromosome number is doubled during this phase of meiosis. B. In females, the two X chromosomes remain together. C. In males, the X chromosome is segregated from the Y chromosome. D. The centromeres of the chromosomes divide. E. Homologous chromosomes move as one unit.
Respond to statements 146–150 in reference to the five animal
phyla listed below. a. Porifera b. Cnidaria c. Platyhelminthes d. Nematoda e. Annelida D 146. Members of this phylum have a pseudocoelomic cavity. D 147. Members of this group have a brain with nerve cords, have a saclike or branched gut, and lack a circulatory system. M 148. Members of this phylum have a brain with a ventral nerve cord, a complete gut, and a circulatory system that is usually closed. E 149. This phylum contains the most primitive species of the animal kingdom in the list. M 150. Tapeworms are members of this phylum.
Free fetal DNA (ffDNA) originates from the breakdown of fetal cells and their nuclei in the ____________________.Fill in the blank(s) with the appropriate word(s)
Which of the following is responsible for the impermeability of the epithelium lining the bladder and ducts connecting the pancreas to the digestive tract?
A) adherens junctions B) gap junctions C) desmosomes D) tight junctions E) hemidesmosomes