#Question id: 1006
#Unit 1. Molecules and their Interaction Relevant to Biology
Four of the ten enzymes required for the biosynthesis of IMP are listed below. In which order do the reactions these enzymes catalyze occur during the synthesis of IMP?
1. IMP cyclohydrolase
2. GAR synthase
3. glutamine-PRPP amidotransferase
4. AIR carboxylase
#Question id: 18845
#Unit 13. Methods in Biology
#Question id: 3032
#Unit 2. Cellular Organization
Which of these statements about prokaryotes is correct?
#Question id: 10239
#Unit 10. Ecological Principles
Two species of barnacle, balanus balanoides and Chthamalus
stellatus, occur in the intertidal regions of Scotland. As following
Which of the following statements is correct?
#Question id: 5673
#Unit 5. Developmental Biology
Species-specific sperm attraction has been documented in numerous species. In echinoderms, sperm are attracted toward eggs of their species by chemotaxis. Following statements are about chemoattraction-
A. In this process Sperm follows a gradient of a chemical secreted by the egg.
B. These oocytes control only the type of sperm they attract, but not the time at which they attract them.
C. Releasing the chemotactic factor only when the sea urchin egg has completed all of its meiotic divisions .
D. Releasing the chemotactic factor only when the sea urchin egg is in second metaphase of its meiotic division.
E. The mechanisms of chemotaxis differ among species and chemotactic molecules are different even in closely related species.
Which of the following statement are incorrect about this process?