The first major divergence of life followed the origin of ____
a. aerobic respiration
b. nucleic acids
c. endomembrane system
d. cells
e. endosymbiotic origin of mitochondria
ANSWER: d
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According to one hypothesis, how is water tension in the leaves maintained to pull water up the xylem?
A. Water is pulled by capillary action into spaces in between the cell wall, much like a sponge. B. Water is pulled up through the xylem due to capillary forces. C. Water exits the stomata due to capillary forces. D. Water is pushed up the xylem due to high water pressure from the roots. E. Water is pushed down from the leaves to the roots during hot sunny days.
The formation of an infection thread is an important initial part of microbial interactions with plants in the process of ________.
A. nitrogen fixation B. sulfate reduction C. denitrification D. nitrification
Recombinant chromatids have a mix of paternal and maternal alleles due to
a. crossing over having happened between the linked genes. b. independent assortment. c. persistent linkage of genes on the chromatid. d. point mutations and gene aberrations from replication. e. random fertilization of the gametes.
Which type of angiosperm typically has parallel leaf veins and a fibrous root system?
A) Monocot B) Dicot C) Conifer D) Legume