The scientists who identified a set of coordinately regulated genes, called an operon, responsible for lactose metabolism in E. coli were
A) Watson and Crick.
B) Meselson and Stahl.
C) Jacob and Monod.
D) Hershey and Chase.
C) Jacob and Monod.
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If these organisms were represented in an energy pyramid, which group would have the
smallest number of organisms?
a. sunflowers b. beetles c. spiders d. possums
Mechanoreceptors are located in
a. internal organs. b. skin. c. joints. d. tendons. e. all of these.
Which stage in development occurs first?
a. cleavage b. morula c. gastrula d. zygote e. blastula
Answer the following questions true (T) or false (F)
1. It generally takes the enzymes from dozens of sperm for one sperm to gain access to the oocyte membrane. 2. Sperm cells do not need a nucleus and expel it during development as a weight-saving tactic. 3. Human embryos do not go through a morula stage of development as do most other animals.