Which one of the following is a type of sensory receptor that senses changes in blood
A. chemoreceptor
B. mechanoreceptor
C. proprioceptor
D. nociceptor
B
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Protobionts are thought to be the first nonliving structures that evolved into living cells. A critical characteristic of a protobiont that is found in both modern day prokaryotes and eukaryotes is
A. internal compartments that subdivide metabolic functions. B. a boundary membrane that separates external from internal environments. C. the ability to exclude all organic substances. D. the ability to fuse with any other protobiont for reproduction. E. the ability to recognize other protobionts for developmental purposes.
The ability to maintain an upright position is due to ________ muscle contractions
Fill in the blank(s) with correct word
What is the purpose of flowers?
A. to attract pollinators B. to support gamete production C. to capture wind-blown pollen D. to protect reproductive structures E. All answers are correct.
Which structure serves as an impenetrable barrier that prevents more than one sperm from fertilizing an egg?
A) the acrosome B) the jelly coat of the egg C) the sperm's plasma membrane D) the vitelline layer