Which of the following would be analogous structures?
A. the wing of a bird and the wing of a bee
B. the wing of a bee and the wing of a bat
C. the wing of a bat and the wing of a bird
D. All of these answers are correct.
D. All of these answers are correct.
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Leaves appear red in the fall when ____
a. anthocyanin synthesis increases b. chlorophylls are disassembled and recycled to allow other pigments to become more visible c. other pigments, including the orange and yellow accessory pigments, are recycled d. synthesis of other pigments, including the orange and yellow accessory pigments, increases e. the red wavelength range of visible light increases due to changes in Earth's position relative to the sun.
A testcross consists of
a. a cross of two pure-breeding forms to find out which form of a gene is dominant. b. a cross between two unknown forms to determine their genotypes. c. a cross between an offspring and its parent. d. a cross of an F1 hybrid to an individual that is homozygous recessive. e. a cross of two F2 individuals to produce an F3 generation.
Cells in the quiescent phase of the cell cycle are said to be in the _______ phase.
a. G0 b. G1 c. G2 d. M
Xylem tissue may contain each of these cell types, except which?
A. Rays B. Sieve cells C. Fibers D. Vessel members E. Tracheids