There are different types of microscopes that can be used to provide information about cells. Which type of microscope is used for the observation of living cells?
A) light microscope
B) scanning electron microscope
C) transmission electron microscope
A
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In eukaryotic cells, sequences of mRNA removed before translation are called
A. introns. B. anticodons. C. exons. D. rRNA. E. terminators.
Glucose moves across continuous capillary walls by what mechanism?
A) primary active transport B) transcytosis C) secondary active transport D) diffusion E) facilitated
Correctly order the steps involved cellular immunity:
1. The Tc recognizes the infected host cell 2. The Tc interacts with epitope presented by MHC-I on the dendritic cell 3. The Tc secretes perforin and granzyme, causing apoptosis 4. The helper T cell activates the Tc cell a. 2,1,3,4 b. 4,2,1,3 c. 2,4,1,3 d. 1,2,4,3
Resting membrane is established by equal levels of (i) ___________, and (ii) _______________.
a) (i) diffusion (efflux of K+), (ii) electric force (influx of K+) b) (i) diffusion (influx of K+), (ii) electric force (efflux of K+) c) (i) diffusion (efflux of Na+), (ii) electric force (influx of Na+) c) (i) diffusion (influx of Na+), (ii) electric force (efflux of Na+)