Engelmann concluded that chlorophyll in the chloroplasts is responsible for photosynthesis based on
the following results:a.
Spirogyra cells each contain a long, spiral-shaped, emerald-green chloroplast embedded in
the cytoplasm.
b. The action spectrum of photosynthesis matched the maximum production of oxygen by
Spirogyra, observed by the greatest accumulation of bacteria in the blue and red regions of
the spectrum.
c. Bacteria exposed to the action spectrum for photosynthesis showed no preference to any
particular color of light.
d. Accessory pigments transfer some of the energy of excitation produced by green light to
chlorophyll molecules.
e. Protons flow through the ATP synthase complex.
B
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A species goes extinct without any clear, single cause.
A. hotspot B. habitat loss C. edge effects D. megafaunal extinction E. extinction vortex
Doctors who pass an examination designed and administered by the specialty board are referred to as ________
Fill in the blank(s) with correct word
Which types of hormones can enter cells and turn specific genes on and off?
a. steroid and peptide hormones b. steroid and thyroid hormones c. thyroid and peptide hormones d. peptide and phospholipid hormones e. steroid and phospholipid hormones
How does the scanning electron microscope differ from the transmission electron microscope?
a. The SEM can view a live specimen. b. The SEM can view the internal structure of a cell. c. The SEM utilizes a beam of light that passes through the specimen. d. The SEM gives a three dimensional image of the object being studied. e. The SEM relies on the detection of electrons from the beam after contact with the specimens.