Cell division in the apical meristems at the tips of a plant that results in increases in height or length is called
A. primary growth.
B. herbaceous growth.
C. mitotic growth.
D. vascular cambium growth.
E. secondary growth.
Answer: A
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Which cell structure is most likely responsible for sensing gravity?
A. central vacuole B. Golgi appartus C. chloroplast D. amyloplast E. apical meristem
In garden peas, one pair of alleles controls the height
of the plant, and a second pair of alleles controls flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with purple flowers crossed with a tall plant with white flowers produces 3/8 tall purple, 1/8 tall white, 3/8 dwarf purple, and 1/8 dwarf white. What is the genotype of the parents? What will be an ideal response?
What makes certain red algae appear red?
A) They live in warm coastal waters. B) They possess pigments (phycoerythrin) which reflects and transmits red light. C) They use red light for photosynthesis. D) They lack chlorophyll. E) They contain the water-soluble pigment anthocyanin.
Charcot-Marie-Tooth is the most commonly inherited peripheral neuropathy, and has no known cure. Patients suffer damage to motor and sensory neurons, leading to degeneration of muscles and gradual loss of motor control.Mutation of the peripheral myelin protein 22 (PMP22) gene, which causes demyelination of peripheral neurons, is a more common cause of Charcot-Marie-Tooth disease. In which cells is the function of the PMP22 gene important for normal function?
A. Schwann cells B. Peripheral neurons C. Fibroblasts D. Astrocytes E. Oligodendrocytes