Which of the following is not a type of connective tissue?
a. bone
b. muscle
c. blood
d. cartilage
B
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Exposure to light and the pull of gravity will cause a root to grow downward into the soil
What will be an ideal response?
Genetic drift is a random process that can change the genetic structure of a population
a. True b. False Indicate whether the statement is true or false
In vertebrates, DNA methylation - the addition of a methyl group to DNA nucleotides - ensures that
A. the gene functions without interruption. B. once that gene is transcribed, the mRNA is saved and used over and over again. C. no errors will be made during transcription. D. once a gene is turned off, it will remain off. E. the nucleosome will quickly form, which assists in mRNA formation.
The surface of each B lymphocyte is covered with about 250,000 to 500,000 identical copies of (BCR/MHC/TCR).
Fill in the blank(s) with the appropriate word(s).