What is the most common "reward" for butterflies from flowers they pollinate?
A. fruit
B. seeds
C. honey
D. pollen
E. nectar
Answer: E
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As the result of exposure to a mutagen, cytosine is substituted for thymine in one strand of DNA. Upon subsequent DNA replication, one of the daughter cells will have a GC pair in this position instead of an AT pair. This is called a(n) ________ mutation.
A. insertion B. transition C. frameshift D. transversion
Sex influenced traits are influenced by the presence of ____
a. cortisol b. estrogen c. testosterone d. thyroid hormone e. both estrogen and testosterone
Anabolic steroids:a
are removed from the body fairly quickly due to a low concentration of receptor sites. b. decrease HDL concentration, thereby increasing the risk of cardiovascular disease. c. are naturally produced hormones typically used by athletes for short-term performance enhancement. d. have little or no effect on physiology or behavior at very low doses. e. are metabolized and excreted from the body quickly..
Which is true about Stage 2 sleep?
-it generally makes up 50% of an adult's sleep time -it is characterized by Theta waves, sleep spindles, and K complexes -breathing becomes regular -muscles become more relaxed