How are B-cell receptors different from antibodies?
a. B-cell receptors bind antigen, while antibodies do not.
b. B-cell receptors do not contain heavy chains, while antibodies do.
c. B-cell receptors include a variable region, while antibodies do not.
d. B-cell receptors include a transmembrane domain, while antibodies do not.
e. B-cell receptors are produced by B cells, while antibodies are not.
D
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Which structure do turtles lack?
a. carapace b. jaws c. teeth d. plastron e. keratinized beak
The above figure shows that ________.
A. meiosis forms diploid gametes B. meiosis results in the formation of four haploid daughter cells C. the human 2n number is 4 D. fertilization results in four haploid daughter cells
You wanted to test a single fruit fly for the presence of the TOLL protein , so you prick it with a needle coated in fungal spores. The fly dies 2 days later. Which of the following statements is TRUE?
A. The TOLL protein is only found in humans. B. This is evidence that the TOLL protein is not present. C. This is evidence that the TOLL protein is present. D. This is inconclusive evidence.
Cyanide binds and impairs one of the molecules involved in the synthesis of ATP. The target organelle for cyanide must be
A. mitochondria. B. peroxisomes. C. ribosomes. D. the endoplasmic reticulum. E. lysosomes.