Our species is called Homo sapiens. The first word refers to which taxonomical grouping?
A. Genus
B. Order
C. Kingdom
D. Species
E. Phylum
Answer: A
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How much energy is ultimately converted into chemical energy by photosynthesis?
a. less than 1% b. 1-2% c. 5% d. 10% e. 20%
Some mutagens cause genetic changes that can be "corrected" by reexposing cells to the same mutagen. Other mutagens do not behave in this way. Provide one example of each of these two types of agents and describe the mutational changes caused in
Explain why some mutagens behave in one way, whereas others do not.
What must occur before a newly made polypeptide is secreted from a cell?
A) It must be translated by a ribosome that remains free within the cytosol. B) Its signal sequence must target it to the ER, after which it goes to the Golgi. C) Its signal sequence must be cleaved off before the polypeptide can enter the ER. D) Its signal sequence must target it to the plasma membrane, where it causes exocytosis.
A nitrogenous base composed of two rings is a (purine/pyrimidine/ribose)
What will be an ideal response?