Four of the following are features found exclusively among all vertebrate embryos. Which one is the exception?
A. Notochord
B. Pharyngeal gill slits
C. Four legs
D. Post-anal tail
E. Dorsal nerve cord
Answer: C
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Which of these events happens first in nearly all seed germination?
A) The cotyledons appear above ground, turn green, and photosynthesize. B) The radicle emerges from the seed, which permits the uptake of water and nutrients from the soil. C) The hypocotyl elongates to lift cotyledons above ground. D) Lateral roots develop and expand into surrounding soil.
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.
The Delaney Clause
Select one: a. prevents the intentional use as food additives of compounds shown to cause cancer in laboratory animals or humans. b. defines the maximum dosage of a food additive that causes no observable effects in rats and mice. c. lists food additives that are generally recognized as safe. d. grants the USDA jurisdiction over food additives.
Explain what occurs during endocytosis.
What will be an ideal response?