What evidence supports the hypothesis that the nuclear envelope of eukaryotes arose from infolding of the plasma membrane?
A. Eukaryotes and prokaryotes differ in control of gene expression.
B. No modern bacteria have infolded plasma membranes.
C. The nuclear membrane allows separation of transcription and translation.
D. The nuclear membrane and endoplasmic reticulum (ER) of modern eukaryotes are continuous.
Ans: D. The nuclear membrane and endoplasmic reticulum (ER) of modern eukaryotes are continuous.
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Which of the following genera of the Planctomycetales have a stalk as part of their mechanism for attachment to surfaces?
A. Planctomyces B. Priullela C. Gemmata D. All of the choices are correct.
Gardeners sometimes plant clover between productive growing seasons. Why would this practice be beneficial?
A. Several types of nitrogen-fixing bacteria form a symbiotic relationship with the roots of clover. This would increase the amount of nitrogen in the soil available for subsequent seasons of other plants' growth. B. Clover is consumed by a number of animals. This would encourage the animals to feed/graze on the areas, leaving behind nitrogen-rich manure that would act as a natural fertilizer for subsequent seasons of other plants' growth. C. Clover is a unique plant that is capable of atmospheric nitrogen-fixation (pulling nitrogen directly out of the air and turning it into ammonia or amino acids). This directly provides nitrogen compounds for the soil for subsequent seasons of other plants' growth. D. The beneficial effect is more for water retention and elimination of soil erosion in between growing seasons. It has nothing to do with nitrogen compounds in the soil.
The accompanying figure is a micrograph of what kind of tissue?
a. cardiac muscle b. skeletal muscle c. smooth muscle d. cartilage e. dense connective
During fermentation, ATP is usually produced by
a. oxidative phosphorylation. b. the citric acid cycle. c. the proton motive force. d. substrate-level phosphorylation.