Answer the following statements true (T) or false (F)
1. The fossil record is often incomplete, in part because scientists will never be able to discover some of the fossils that are buried deep in the earth.
2. When ocean levels dropped about 70 million years ago, marsupial mammals moved into North America and displaced many of the placental mammal species.
3. Placental mammals give birth to more fully developed offspring than marsupial mammals and therefore have a greater chance of offspring survival. This helps to explain why placental mammals from North America displaced many native South American marsupial mammals when a land bridge formed
between the two continents.
4. The common skeletal organization between two vertebrate animals, with bony limbs used for movement, is a example of analogous structures.
5. The techniques used to study molecular evolution are based on the comparison of nucleotide and amino acid sequences among species.
1.TRUE
2.FALSE
3.TRUE
4.FALSE
5.TRUE
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A) A B) B C) C D) D E) E
Which of the following cellular processes has/have been linked to cancer/tumor formation?
A) autophagy B) EGF desensitization C) caveolae uptake D) NMDA receptors E) both choices A and B
Answer the following statements true (T) or false (F)
1. Apoptosis through the extrinsic pathway is activated by factors such as lack of oxygen or growth factors. 2. Apoptosis is used in humans in order to eliminate cells infected by viruses, cells that are worn out, and those that have the potential to cause cancer. 3. Ligands that promote cell death are typically found on the surface of cells of the immune system that recognize abnormal cells and target them for destruction. 4. The most prominent tissue type present in plants is the dermis.
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A) inflammatory B) humoral C) autoimmune D) complement-mediated