Which cells would spend the most time in interphase?
A) skin cells on the hands
B) epithelial cells lining the intestine
C) nerve cells in the brain
D) mucous membrane cells in the mouth
C
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You have chosen RNA as the most likely molecule to be first enclosed by a membrane. You understand that it has the ability to store information and can self-replicate, but what else is necessary for simple metabolic processes to occur in a timely manner?
A. A biological catalyst. B. Energy from ADP. C. A pump, to drive a concentration gradient. D. A more stable nucleic acid. E. The ability to carry out structural roles.
Describe two roles that sunlight plays in the marine environment
What will be an ideal response?
Four of the following statements about Denisovians are true. Which statement is false?
a. They are most closely related to Homo erectus. b. The first fossils were found in Siberia. c. Fossils attributed to this group have been found in Spain. d. The first fossil to be found was a pinky finger. e. They may be at least 400,000 years old.
Which is an example of temporal isolation?
A. Two plant species have incompatible gametes. B. Two plant species live on the same mountainside, but one lives on rocky outcrops and the other in open meadows. C. One plant species blooms in June-July, and a second plant species blooms in August-September. D. One plant species is pollinated by bees and a second plant species is pollinated by moths.