______________ is a thick fluid inside the chloroplast membrane. Suspended within it are disk-like membranous sacs known as _______________, which are concentrated in stacks called _______________.

a) The stroma, grana, phloem
b) The stroma, grana, xylem
c) The stroma, thylakoids, xylem
d) The stroma, thylakoids, grana
e) The stroma, thylakoids, phloem


Ans: d) The stroma, thylakoids, grana

Biology & Microbiology

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The conclusion that early hominids were bipedal is

based in part on examination of a. their S-shaped backbone. b. the position of the foramen magnum. c. footprints. d. positions of the foramen magnum, S-shaped backbone and footprints. e. length of the femur.

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Scientific work involves ______________________________.

A. the natural and supernatural world B. retesting theories frequently for verification C. proving theories with absolute certainty D. testing hypotheses under every possible circumstance E. coming up with the best objective descriptions of reality

Biology & Microbiology

The number of individuals occupying a unit of habitat (volume or area) is the ___________.

A. distribution B. carrying capacity C. population density D. population size E. birth rate

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Which of the following statements concerning the primary motor area is not true?

A. Voluntary commands to skeletal muscles begin in the primary motor area. B. The primary motor area is in the cerebellum. C. The primary motor area is located anterior to the central sulcus. D. The area that controls the thumb, fingers, and hand is larger than the area controlling the leg. E. Control of muscles responsible for facial movements take up a large portion of the primary motor area.

Biology & Microbiology