Steriod hormones are effector molecules
Indicate whether the statement is true or false
TRUE
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Dr. Ratard was trying to determine the cause of a mysterious epidemic affecting fish in the gulf of New Mexico. His proposal that the deaths were caused by an organism called a protist is considered a(n) _________
A. theory. B. data set. C. hypothesis. D. conclusion. E. experiment.
Genes in the Hox family of homeobox genes control the body plans of animals along the ____ axis, including where
____ will develop on the animal’s body.
a. dorsal-ventral; appendages b. dorsal-ventral; light-sensing organs c. internal-external; internal organs d. anterior-posterior; appendages e. anterior-posterior; light-sensing organs
Oral bacteria on the tooth surface
A. use fimbriae and slime layers to adhere. B. develop a biofilm. C. metabolize sucrose, produce sticky glucans, and form plaque. D. All of the above are correct.
The caplike structure that covers the head of the sperm and releases enzymes that will help the sperm penetrate the egg is the
A. epididymis. B. vas deferens. C. acrosome. D. mitochondrion. E. nucleus.