Glucose molecules provide energy to power the swimming motion of sperm. In this example, the sperm are changing
A) chemical energy into kinetic energy.
B) chemical energy into potential energy.
C) kinetic energy into potential energy.
D) kinetic energy into thermal energy.
Answer: A
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Two principal organelles in eukaryotes that were apparently derived from different types of bacteria are the
A. microfilaments and microtubules. B. mitochondria and chloroplasts. C. rough ER and smooth ER. D. plasma membrane and nuclear membrane.
The bladder and rectum are located in which body cavity?
a. cranial b. thoracic c. spinal d. abdominal e. pelvic
Which of the following hormones is released to correct a hypoglycemic state?
a. Insulin b. Testosterone c. Estrogen d. Glucagon
Which statement best describes the relationship between methylation and gene activity?
a. DNA methylation is generally associated with transcriptional inactivity. b. DNA methylation is generally associated with translational inactivity. c. DNA methylation is generally associated with transcriptional activity. d. Histone methylation is generally associated with transcriptional inactivity. e. Histone methylation is generally associated with transcriptional activity.