Which of the following best describes the condition in which the terminal bud of many plants produces hormones that inhibit growth of axillary buds?
A) biennial
B) secondary growth
C) apical dominance
D) germination
C
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A function of antibodies is to _____
A) inject toxins into living pathogens B) secrete cytokines that attract macrophages to infection sites C) release perforins to disrupt infected cells D) act as Toll-like receptors E) mark pathogenic cells for destruction
Identical copies of each chromosome are called ________ and are joined at the ________.
A. homologues; centromere B. sister chromatids; centromere C. sister chromatids; kinetochore D. homologues; kinetochore
Which of the following is a true statement about plant reproduction?
A) Embryophytes are small plants in an early developmental stage. B) Male and female bryophytes each produce a type of gametangia. C) Eggs and sperm of most land plants swim toward one another. D) Bryophytes are limited to asexual reproduction.
What happens to the CFTR gene in individuals who have cystic fibrosis?
a. the entire gene is duplicated b. three bases are duplicated, causing one amino acid to repeat about 40 times c. the entire gene is deleted d. three bases are deleted, causing one acid to be missing