How many nucleotides are in a human chromosome?
A) Millions B) Four C) Two D) Thousands
A
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True or false: harmful mutations are always eliminated from the genome in one or a few generations because they decrease the survival and reproduction rates of the individuals that carry them
A. true B. false
Rosalind Franklin died from ovarian cancer at the age of 37. Her cancer was probably caused by DNA mutations that
arose from _____.
a. extensive exposure to long wavelength radiation b. contaminated DNA samples c. chemical exposure d. unrepaired DNA replication errors e. extensive exposure to x-rays
Embryonic shoots located at the tips of stems are called __________, while those located in the angle
between leaves and stems are known as __________. a. nodes; internodes b. axillary buds; terminal buds c. terminal buds; axillary buds d. axillary buds; lateral buds e. bud scales; bud scale scars
?
Figure 27.5
Use the figure above to answer the following question.
The letter "B" in the accompanying figure represents ____.
A. pericycle B. endodermis C. xylem D. root cortex E. phloem