Why does an organism that is able to respire both aerobically and anaerobically preferentially undergo aerobic respiration?
What will be an ideal response?
Answer: Oxygen as the terminal electron acceptor is preferred over other molecules, because aerobic respiration yields more energy. The glucose produced by aerobes can be directly used as a carbon source, whereas anaerobes use additional energy in the Calvin cycle to obtain a carbon source.
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Sister chromatids are joined by a common centromere and each carries identical ____________________
Fill in the blank(s) with correct word
Refer to the cladogram below. Which synapomorphy is common to the lizard and rabbit but not the salmon?
A. Notochord.
B. Vertebrae.
C. Tetrapod locomotion.
D. Mammary glands.
Neural activity involves transmission of information through electrical events, in contrast endocrine
activity involves
a. transport of hormones in the circulation system to target tissues. b. transport of hormones in neurons to target tissues. c. release of hormones in body fluids for transport. d. changes in neural activity for transport of hormones to target tissues. e. transmission of information through chemical reactions.
How many mass extinctions were experienced on a global scale before the alarming mass extinction that's now occurring?
A) six B) five C) two D) none