All of the following occur during the latent period of muscle contraction EXCEPT which one?
A) Myofibrils shorten.
B) Calcium is released from the sarcoplasmic reticulum.
C) Muscle cell membrane initiates an electrical impulse, which travels into the muscle cell.
D) Myosin heads bind to actin filaments.
E) Troponin-tropomyosin complex shifts, exposing myosin heads.
A
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Which of the following CANNOT be repaired by nucleotide excision repair (NER)?
A. ultraviolet-induced damage B. chemically modified bases C. missing bases D. mismatched bases E. pyrimidine dimers
The most widely accepted and supported model that explains the movement of phloem sap in flowering plants is the
____ mechanism.
a. cohesion-tension b. translocation c. pressure flow
d. osmosis e. transpiration
The chemical reactions of photosynthesis occur in which cellular organelle?
A) Chloroplasts B) Nucleus C) Mitochondria D) Ribosomes
Based on your knowledge of the differences between the male and female urinary systems, why are females at greater risk of bladder infections?
What will be an ideal response?