Diploid cells of animals and plants are genetically similar to fungal
A. monokaryotic hyphae.
B. dikaryotic hyphae (1n+1n).
C. homokaryotic hyphae.
D. spores.
E. triploid cells.
B. dikaryotic hyphae (1n+1n).
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While digging in your vegetable garden, you accidentally slice a thick root in half with your trowel, and find yourself looking at a bold X shape in the middle of the root. What can you say about the plant this root belonged to?
a. It was probably a monocot. b. It was probably an epiphyte. c. It was probably a dicot. d. It was probably a weed.
Multistranded cords of primary xylem and phloem are
a. vascular bundles. b. found only in monocots. c. found only in dicots. d. formed by stele. e. formed by pith.
Tetralogy of Fallot (TF) is a genetic disorder characterized by four major malformations of the heart. The circulation of blood is abnormal, so TF patients have too little oxygen in their blood. Inadequate oxygen levels result in damaged mitochondrial membranes, which in turn cause cells to self-destruct. In 2004, Sarah Kuruvilla and her colleagues looked at abnormalities in the mitochondria of
heart muscle in TF patients. Some of their results are shown in Figure 7.13 (on previous slide). What conclusion do the data support about mitochondrial abnormalities and levels of oxygen saturation of the blood (SPO2)?
1.Abnormalities in size of mitochondria is not an important factor.
2.Abnormalities in number of mitochondria have a significant impact on SPO2.
3.The combination of broken mitochondria and abnormal numbers of mitochondria causes the lowest levels of SPO2.
4.Younger patients have lower levels of SPO2.
Which of the following is not consistent with the theory of natural selection?
1.Individuals in a given population can vary in the specifics of shared traits. 2.Populations have an inherent ability to maintain a constant population size over time. 3.Resources become limited when a population expands. 4.Natural selection explains both the diversity of species and why there is variation within populations.