The cell plate is composed of
a. microfilaments.
b. the cytoplasmic membrane.
c. vesicles with wall-building materials.
d. Golgi bodies.
e. microtubules
C
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Why are introns important in understanding the evolutionary history of organisms?
A. Transcribed intron sequences are removed during mRNA processing before translation occurs and since selection operates only on expressed traits, introns often change more slowly than do protein-coding genes. B. Transcribed intron sequences only are expressed in an anoxic environment and hence their presence indicates organisms that evolved before the Earth had oxygen in its environment. C. Introns respond to natural selection faster than do protein-coded genes and therefore provide information about the rate of evolution. D. Introns and protein-coded genes operate in the same way but there are more introns than protein-coded genes and consequently introns provide better patterns. E. All of the other choices provided are incorrect.
Archaeopteryx is a transitional form between
a. birds and mammals. b. mammals and reptiles. c. birds and reptiles. d. fish and amphibians. e. amphibians and reptiles.
If our bodies are capable of secondary responses, how do people contract influenza more than once?
a. Memory cells lose their ability to recognize antigens after six months. b. The affinity of antibodies diminishes in the secondary response. c. New varieties of flu virus continuously evolve. d. Our bodies cannot launch a strong enough immune response against the flu virus. e. There are no effective vaccinations for the flu.
How many chromosomes should be in a generative cell nucleus?
A) 8 B) 16 C) 24 D) 32