Which of the following processes is involved in the bulk transport of molecules out of the cell?
a. phagocytosis
b. pinocytosis
c. receptor-mediated endocytosis
d. exocytosis
e. None of these are correct.
d. exocytosis
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When the DNA sequence of the gene that codes for the peptide hormone insulin is compared in two mammals (e.g., humans and rats), most of the sequence differences are silent mutations
These far outnumber sequence differences that result in amino acid substitutions. Why might this be? A. Mutations are random with respect to an organism's needs. B. Amino acid substitutions often result in proteins that have lost or compromised function, and so are selected against. C. A DNA sequence is more likely to mutate if the change does not alter the amino acid sequence. D. Most amino acid substitutions result in a beneficial phenotype that improves fitness and results in a greater number of offspring. E. Silent mutations occur in noncoding DNA sequences.
This cycle begins when the lambda circular chromosome integrates into the host cell's DNA by
crossing over. Once integrated, the lambda genes are mostly inactive. This cycle is referred as
a. lytic cycle. b. lysogenic cycle. c. Krebs cycle. d. citric acid cycle. e. lytic or lysogenic cycle.
Which structure delivers a signal from the motor neuron to all the sarcomeres of a muscle cell?
A) myosin filament B) filaments-line C) T tubule D) sarcoplasmic reticulum
Which of the following is a trace element absorbed by roots?
A. nitrogen B. phosphorus C. zinc D. potassium