The biceps brachii is responsible for flexing the forearm while the triceps brachii extends the forearm. Muscles with such opposite actions are called
(a) cooperative.
(b) antagonistic.
(c) involuntary.
(d) sensory.
(b) antagonistic.
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The whorl of a flower that consists of all the petals is the
A. stamen. B. carpel. C. stigma. D. calyx. E. corolla.
An initiator tRNA is loaded onto a small ribosomal subunit, which locates the start codon. What happens immediately following this event?
1.A new tRNA moves into the P site and the previous amino acid is transferred from its tRNA to the amino acid the new tRNA is carrying.
2.The anticodon of the initiator tRNA matches up with the mRNA start codon.
3.The new polypeptide chain is released from the ribosome.
4.The large ribosomal subunit joins to the small ribosomal subunit.
Which of the following statements about bacteria is false?
a. A small percentage of bacteria are pathogenic. b. Some bacteria can photosynthesize. c. Bacteria are important decomposers. d. Bacteria are not cellular and are sometimes not classified as life forms. e. Bacteria convert atmospheric nitrogen into ammonia and then nitrates that can be used by plants.
The genera ________ and ________ are amoebic human parasites that cause gastrointestinal and brain infections, respectively
a. Entamoeba / Giardia b. Entamoeba / Naegleria c. Naegleria / Entamoeba d. Naegleria / Giardia