The endoplasmic reticulum is mostly devoid of ribosomes (smooth ER) when cells are producing large quantities of lipid.
Answer the following statement true (T) or false (F)
True
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The "9 + 2" pattern of the axoneme is nine ________ of microtubules and two additional microtubules in the center called the ________.
A) outer doublets; central pair B) basal bodies; inner two C) central tubules; double pair D) circular structures; middle two E) triplet groups; basal bodies
Which of the following characteristics does not apply to members of Protheria?
a. nocturnal b. insectivores c. aquatic d. placental mammals e. some weigh less than 5 g
Vlad, 28 years old, is a slender, jumpy man with eyes that seem to bulge out of their sockets. His heart rate is unusually fast. Which of the following conditions does Vlad most likely have?
A) Addison's disease B) acromegaly C) Cushing's syndrome D) Graves' disease
What was the probable role of oxygen gas in the early stages of life's appearance on Earth?
A) Cellular respiration, which depends on oxygen availability, provided abundant energy to the first life-forms. B) Oxygen promoted the formation of complex organic molecules through physical processes. C) Oxygen gas tends to disrupt organic molecules, so its absence promoted the formation and stability of complex organic molecules on the early Earth. D) Abundant atmospheric oxygen would have created an ozone layer, which would have blocked out ultraviolet light and thereby protected the earliest life-forms.