________ cells lack cytoplasm at maturity, are tough and thick-walled, and serve to strengthen tissues.
A. Meristem
B. Parenchyma
C. Sclerenchyma
D. Collenchyma
Answer: C
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The thin horizontal arrows in the figure above show that the _____
A) warmer arterial blood can bypass the legs as needed, when the legs are too cold to function well B) warmer venous blood transfers heat to the cooler arterial blood C) warmer arterial blood transfers heat to the cooler venous blood D) arterial blood is always cooler in the abdomen, compared to the temperature of the venous blood in the feet of the goose E) goose's legs get progressively warmer as the blood moves away from the abdomen towards the feet
Replication of DNA occurs during ____
a. S phase b. G1 phase c. G0 phase d. prophase e. cytokinesis
Which of the following allowed for
evolutionary innovations in body form?
a. bilateral symmetry b. segmentation c. coelomate evolution d. ectoderm development e. gastrovascular cavities
Which of the following is the most common chromosome disorder among live-born infants?
A) Klinefelter syndrome B) Turner syndrome C) Down syndrome D) Trisomy X