Which of the following types of membrane proteins are responsible for conveying external messages such as those sent by a hormone signal?
A) Recognition proteins
B) Receptor proteins
C) Connection proteins
D) Transport proteins
E) Enzymes
Answer: B) Receptor proteins
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Oligotrophic organisms do NOT grow well under nutrient-replete conditions
Indicate whether the statement is true or false.
Which of the following happens when you
focus on an object close up?
a. the ciliary muscles contract and the lens flattens b. the ciliary muscles relax and the lens bulges c. the ciliary muscles contract and the lens bulges d. the cilliary muscles relax and the lens flattens e. more than one of these occur when you focus on an object close up
DNA replication in vivo requires a primer with a free 3' end. What molecular species provides this 3' end, and how is it provided?
What will be an ideal response?
Prokaryotes are very important ecologically because of their involvement in all of the following except
A. STDs. B. denitrification. C. photosynthesis. D. nitrogen fixation. E. bioremediation.