Most of the oxygen in the blood is transported by:
a. plasma
b. serum
c. platelets
d. hemoglobin
e. leukocytes
d
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Agrobacterium infects plants and causes them to form tumors. You determine that tumor formation requires a large amount of the plant's energy for tissue formation. How might this change the number of offspring a plant produces
, and what is the most likely explanation for this change? A) The number of offspring should increase, because in general, illness increases the reproductive output of organisms. B) The number of offspring should increase, because the bacteria will provide energy for the plant. C) The number of offspring should decrease, because the plant will divert energy from reproduction to tumor formation. D) There should be no effect of infection on offspring production because energy for reproduction is independent of infection.
Of all the different codons that exist, three of
them a. are involved in mutations. b. do not specify a particular amino acid. c. cannot be copied. d. provide instructions such as STOP. e. do not specify a particular amino acid and provide instructions such as STOP
Why are flexors and extensors considered antagonistic muscles?
A. Both muscle groups bend a limb at the joint, but each can only contract while the other extends. B. Both muscle groups exert only a pulling force when they contract, but they produce opposing movements of the joint. C. One muscle group exerts a pulling force while the other exerts a pushing force. D. Hypertrophy of one muscle group induces atrophy of the other muscle group.
As an oak tree ages, the trunk becomes thicker and woodier due to ________ growth
A) apical meristem B) secondary C) primary D) tertiary E) determinate